diff --git a/src/App.vue b/src/App.vue
index d349903..13b9964 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -43,8 +43,27 @@
         </div>
       </div>
     </nav>
-    <div class="main-container container">
-      <router-view></router-view>
+
+    <div v-if="error" class="container">
+      <div class="message is-danger global-error-message">
+        <div class="message-body">
+          <nav class="level">
+            <div class="level-left">
+              <div class="level-item">
+                <p>Failed to fetch data: {{ error }}</p>
+              </div>
+            </div>
+            <div class="level-right">
+              <div class="level-item">
+                <button class="button is-danger" @click="reload()">Retry</button>
+              </div>
+            </div>
+          </nav>
+        </div>
+      </div>
+    </div>
+    <div v-else class="main-container container">
+      <router-view v-if="routerActive"></router-view>
     </div>
   </div>
 </template>
@@ -57,7 +76,12 @@ export default {
   name: "App",
   components: {},
   computed: {
-    ...mapGetters(["user"])
+    ...mapGetters(["error", "user"])
+  },
+  data() {
+    return {
+      routerActive: true
+    };
   },
   watch: {
     user: function(user) {
@@ -68,6 +92,14 @@ export default {
         });
       }
     }
+  },
+  // method to reload current view from https://github.com/vuejs/vue-router/issues/296#issuecomment-356530037
+  methods: {
+    reload() {
+      this.$store.dispatch("setError", null);
+      this.routerActive = false;
+      this.$nextTick(() => (this.routerActive = true));
+    }
   }
 };
 </script>
@@ -78,4 +110,8 @@ export default {
 .main-container {
   margin-top: 2rem;
 }
+
+.global-error-message {
+  margin-top: 10rem;
+}
 </style>
\ No newline at end of file
diff --git a/src/components/createproject.vue b/src/components/createproject.vue
index d6a8591..156b386 100644
--- a/src/components/createproject.vue
+++ b/src/components/createproject.vue
@@ -19,9 +19,9 @@
       <div class="control">
         <button class="button is-primary" @click="createProject()">Create Project</button>
       </div>
-      <div class="control">
-        <button class="button is-text">Cancel</button>
-      </div>
+    </div>
+    <div v-if="createProjectError" class="message is-danger">
+      <div class="message-body">{{ createProjectError }}</div>
     </div>
   </div>
 </template>
@@ -47,6 +47,7 @@ export default {
   },
   data() {
     return {
+      createProjectError: null,
       user: null,
       remoteSources: null,
       remoteRepos: [],
@@ -56,23 +57,32 @@ export default {
     };
   },
   methods: {
+    resetErrors() {
+      this.createProjectError = null;
+    },
     repoSelected(remoteSource, repoPath) {
       this.selectedRemoteSource = remoteSource;
       this.remoteRepoPath = repoPath;
     },
     async createProject() {
+      this.resetErrors();
+
       let refArray = [this.ownertype, this.ownername];
       if (this.projectgroupref) {
         refArray = [...refArray, ...this.projectgroupref];
       }
       let parentref = refArray.join("/");
 
-      await createProject(
+      let { error } = await createProject(
         parentref,
         this.projectName,
         this.selectedRemoteSource.name,
         this.remoteRepoPath
       );
+      if (error) {
+        this.createProjectError = error;
+        return;
+      }
 
       let projectref = [this.projectName];
       if (this.projectgroupref) {
@@ -84,9 +94,20 @@ export default {
     }
   },
   created: async function() {
-    this.user = await fetchCurrentUser();
+    let { data, error } = await fetchCurrentUser();
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.user = data;
+
     // TODO(sgotti) filter only remote source where the user has a linked account
-    this.remoteSources = await fetchRemoteSources();
+    ({ data, error } = await fetchRemoteSources());
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.remoteSources = data;
   }
 };
 </script>
diff --git a/src/components/createprojectgroup.vue b/src/components/createprojectgroup.vue
index 289b3ea..b506ed9 100644
--- a/src/components/createprojectgroup.vue
+++ b/src/components/createprojectgroup.vue
@@ -15,9 +15,9 @@
       <div class="control">
         <button class="button is-primary" @click="createProjectGroup()">Create Project Group</button>
       </div>
-      <div class="control">
-        <button class="button is-text">Cancel</button>
-      </div>
+    </div>
+    <div v-if="createProjectGroupError" class="message is-danger">
+      <div class="message-body">{{ createProjectGroupError }}</div>
     </div>
   </div>
 </template>
@@ -27,8 +27,6 @@ import { createProjectGroup } from "@/util/data.js";
 
 import { projectGroupLink } from "@/util/link.js";
 
-import remoterepos from "@/components/remoterepos.vue";
-
 export default {
   components: {},
   name: "createprojectgroup",
@@ -39,18 +37,31 @@ export default {
   },
   data() {
     return {
+      createProjectGroupError: null,
       projectGroupName: null
     };
   },
   methods: {
+    resetErrors() {
+      this.createProjectGroupError = null;
+    },
     async createProjectGroup() {
+      this.resetErrors();
+
       let refArray = [this.ownertype, this.ownername];
       if (this.projectgroupref) {
         refArray = [...refArray, ...this.projectgroupref];
       }
       let parentref = refArray.join("/");
 
-      await createProjectGroup(parentref, this.projectGroupName);
+      let { error } = await createProjectGroup(
+        parentref,
+        this.projectGroupName
+      );
+      if (error) {
+        this.createProjectGroupError = error;
+        return;
+      }
 
       let projectgroupref = [this.projectGroupName];
       if (this.projectgroupref) {
diff --git a/src/components/projectgroupsettings.vue b/src/components/projectgroupsettings.vue
index 8450287..0b1b8c2 100644
--- a/src/components/projectgroupsettings.vue
+++ b/src/components/projectgroupsettings.vue
@@ -42,6 +42,9 @@
             >Delete Project Group</button>
           </div>
         </div>
+        <div v-if="deleteProjectGroupError" class="message is-danger">
+          <div class="message-body">{{ deleteProjectGroupError }}</div>
+        </div>
       </div>
     </nav>
   </div>
@@ -64,6 +67,7 @@ export default {
   },
   data() {
     return {
+      deleteProjectGroupError: null,
       variables: [],
       allvariables: [],
       projectGroupNameToDelete: ""
@@ -83,6 +87,9 @@ export default {
     }
   },
   methods: {
+    resetErrors() {
+      this.deleteProjectGroupError = null;
+    },
     async deleteProjectGroup() {
       let projectgroupref = [
         this.ownertype,
@@ -91,7 +98,11 @@ export default {
       ].join("/");
 
       if (this.projectGroupNameToDelete == this.projectGroupName) {
-        let res = await deleteProjectGroup(projectgroupref);
+        let { error } = await deleteProjectGroup(projectgroupref);
+        if (error) {
+          this.deleteProjectGroupError = error;
+          return;
+        }
         this.$router.push(
           projectGroupLink(
             this.ownertype,
@@ -103,16 +114,33 @@ export default {
     }
   },
   created: async function() {
-    this.variables = await fetchVariables(
+    let projectgroupref = [
+      this.ownertype,
+      this.ownername,
+      ...this.projectgroupref
+    ].join("/");
+
+    let { data, error } = await fetchVariables(
       "projectgroup",
-      [this.ownertype, this.ownername, ...this.projectgroupref].join("/"),
+      projectgroupref,
       false
     );
-    this.allvariables = await fetchVariables(
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.variables = data;
+
+    ({ data, error } = await fetchVariables(
       "projectgroup",
-      [this.ownertype, this.ownername, ...this.projectgroupref].join("/"),
+      projectgroupref,
       true
-    );
+    ));
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.allvariables = data;
   }
 };
 </script>
diff --git a/src/components/projects.vue b/src/components/projects.vue
index 76dbf1e..86554d3 100644
--- a/src/components/projects.vue
+++ b/src/components/projects.vue
@@ -32,7 +32,11 @@
 </template>
 
 <script>
-import { apiurl, fetch } from "@/util/auth";
+import {
+  fetchProjectGroupProjects,
+  fetchProjectGroupSubgroups
+} from "@/util/data.js";
+
 import { projectLink, projectGroupLink } from "@/util/link.js";
 
 export default {
@@ -66,24 +70,33 @@ export default {
       return ref;
     },
     async fetchProjects(ownertype, ownername) {
-      let ref = [ownertype, ownername];
+      let projectgroupref = [ownertype, ownername];
       if (this.projectgroupref) {
-        ref.push(...this.projectgroupref);
+        projectgroupref.push(...this.projectgroupref);
       }
-      let path = "/projectgroups/" + encodeURIComponent(ref.join("/"));
-      path += "/projects";
-      let res = await (await fetch(apiurl(path))).json();
-      this.projects = res;
+
+      let { data, error } = await fetchProjectGroupProjects(
+        projectgroupref.join("/")
+      );
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.projects = data;
     },
     async fetchProjectGroups(ownertype, ownername) {
-      let ref = [ownertype, ownername];
+      let projectgroupref = [ownertype, ownername];
       if (this.projectgroupref) {
-        ref.push(...this.projectgroupref);
+        projectgroupref.push(...this.projectgroupref);
       }
-      let path = "/projectgroups/" + encodeURIComponent(ref.join("/"));
-      path += "/subgroups";
-      let res = await (await fetch(apiurl(path))).json();
-      this.projectgroups = res;
+      let { data, error } = await fetchProjectGroupSubgroups(
+        projectgroupref.join("/")
+      );
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.projectgroups = data;
     },
     projectLink: projectLink,
     projectGroupLink: projectGroupLink
diff --git a/src/components/projectsettings.vue b/src/components/projectsettings.vue
index 1514b53..81bc42b 100644
--- a/src/components/projectsettings.vue
+++ b/src/components/projectsettings.vue
@@ -23,6 +23,10 @@
             <button class="button is-primary" @click="updateProject()">Update</button>
           </div>
         </div>
+
+        <div v-if="updateProjectError" class="message is-danger">
+          <div class="message-body">{{ updateProjectError }}</div>
+        </div>
       </div>
     </nav>
     <nav class="panel">
@@ -64,6 +68,10 @@
             @click="deleteProject()"
             :disabled="!deleteButtonEnabled"
           >Delete Project</button>
+
+          <div v-if="deleteProjectError" class="message is-danger">
+            <div class="message-body">{{ deleteProjectError }}</div>
+          </div>
         </div>
       </div>
     </nav>
@@ -92,6 +100,8 @@ export default {
   },
   data() {
     return {
+      updateProjectError: null,
+      deleteProjectError: null,
       project: null,
       projectIsPrivate: false,
       variables: [],
@@ -111,7 +121,13 @@ export default {
     }
   },
   methods: {
+    resetErrors() {
+      this.updateProjectError = null;
+      this.deleteProjectError = null;
+    },
     async updateProject() {
+      this.resetErrors();
+
       let projectref = [
         this.ownertype,
         this.ownername,
@@ -122,9 +138,19 @@ export default {
       if (this.projectIsPrivate) {
         visibility = "private";
       }
-      let res = await updateProject(projectref, this.project.name, visibility);
+      let { error } = await updateProject(
+        projectref,
+        this.project.name,
+        visibility
+      );
+      if (error) {
+        this.updateProjectError = error;
+        return;
+      }
     },
     async deleteProject() {
+      this.resetErrors();
+
       let projectref = [
         this.ownertype,
         this.ownername,
@@ -132,7 +158,11 @@ export default {
       ].join("/");
 
       if (this.projectNameToDelete == this.projectName) {
-        let res = await deleteProject(projectref);
+        let { error } = await deleteProject(projectref);
+        if (error) {
+          this.deleteProjectError = error;
+          return;
+        }
         this.$router.push(
           projectGroupLink(
             this.ownertype,
@@ -148,19 +178,27 @@ export default {
       "/"
     );
 
-    this.project = await fetchProject(projectref);
+    let { data, error } = await fetchProject(projectref);
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.project = data;
     this.projectIsPrivate = this.project.visibility == "private";
 
-    this.variables = await fetchVariables(
-      "project",
-      [this.ownertype, this.ownername, ...this.projectref].join("/"),
-      false
-    );
-    this.allvariables = await fetchVariables(
-      "project",
-      [this.ownertype, this.ownername, ...this.projectref].join("/"),
-      true
-    );
+    ({ data, error } = await fetchVariables("project", projectref, false));
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.variables = data;
+
+    ({ data, error } = await fetchVariables("project", projectref, true));
+    if (error) {
+      this.$store.dispatch("setError", error);
+      return;
+    }
+    this.allvariables = data;
   }
 };
 </script>
diff --git a/src/components/remoterepos.vue b/src/components/remoterepos.vue
index bff9970..b8aed6c 100644
--- a/src/components/remoterepos.vue
+++ b/src/components/remoterepos.vue
@@ -43,7 +43,12 @@ export default {
       this.$emit("reposelected", this.remoterepos[index].path);
     },
     async fetchRemoteRepos(remotesourceid) {
-      this.remoterepos = await userRemoteRepos(remotesourceid);
+      let { data, error } = await userRemoteRepos(remotesourceid);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.remoterepos = data;
     }
   },
   created: function() {
diff --git a/src/components/run.vue b/src/components/run.vue
index bf85026..4000c00 100644
--- a/src/components/run.vue
+++ b/src/components/run.vue
@@ -101,7 +101,13 @@ export default {
       return "unknown";
     },
     async fetchRun() {
-      this.run = await fetchRun(this.runid);
+      let { data, error } = await fetchRun(this.runid);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.run = data;
+
       // sort tasks by level
       let tasks = this.run.tasks;
       let sortedTasks = Object.keys(this.run.tasks)
diff --git a/src/components/runs.vue b/src/components/runs.vue
index 1f3f479..9e926a8 100644
--- a/src/components/runs.vue
+++ b/src/components/runs.vue
@@ -67,8 +67,7 @@
 </template>
 
 <script>
-import { apiurl, fetch } from "@/util/auth";
-import { fetchProject, fetchRuns } from "@/util/data.js";
+import { fetchUser, fetchProject, fetchRuns } from "@/util/data.js";
 import { userLocalRunLink, projectRunLink } from "@/util/link.js";
 
 export default {
@@ -127,15 +126,28 @@ export default {
       this.pollData();
     },
     async fetchProject() {
-      this.project = await fetchProject(
-        [this.ownertype, this.ownername, ...this.projectref].join("/")
-      );
+      let projectref = [
+        this.ownertype,
+        this.ownername,
+        ...this.projectref
+      ].join("/");
+
+      let { data, error } = await fetchProject(projectref);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.project = data;
 
       this.fetchRuns();
     },
     async fetchUser() {
-      let res = await (await fetch(apiurl("/users/" + this.username))).json();
-      this.user = res;
+      let { data, error } = await fetchUser(this.username);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.user = data;
 
       this.fetchRuns();
     },
@@ -159,7 +171,12 @@ export default {
         group = "/user/" + this.user.id;
       }
 
-      this.runs = await fetchRuns(group, lastrun);
+      let { data, error } = await fetchRuns(group, lastrun);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.runs = data;
     },
     pollData() {
       clearInterval(this.polling);
diff --git a/src/components/task.vue b/src/components/task.vue
index e5b7655..196f256 100644
--- a/src/components/task.vue
+++ b/src/components/task.vue
@@ -63,10 +63,20 @@ export default {
       return "unknown";
     },
     async fetchRun() {
-      this.run = await fetchRun(this.runid);
+      let { data, error } = await fetchRun(this.runid);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.run = data;
     },
     async fetchTask() {
-      this.task = await fetchTask(this.runid, this.taskid);
+      let { data, error } = await fetchTask(this.runid, this.taskid);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.task = data;
     },
     pollData() {
       this.polling = setInterval(() => {
diff --git a/src/components/usersettings.vue b/src/components/usersettings.vue
index 842892b..e06a796 100644
--- a/src/components/usersettings.vue
+++ b/src/components/usersettings.vue
@@ -10,26 +10,33 @@
           <button class="button is-primary" @click="deleteUserToken(token)">Delete</button>
         </div>
       </div>
+      <div v-if="deleteUserTokenError" class="message is-danger">
+        <div class="message-body">{{ deleteUserTokenError }}</div>
+      </div>
     </div>
-    <div v-else class="item-list">No user tokens</div>
+    <div v-else>No user tokens</div>
     <hr>
     <div v-if="token" class="notification is-success">
       <button class="delete" @click="closeNewTokenNotification()"></button>
       User token created: {{token}}
     </div>
-    <h4 class="title is-4">Create new User Token</h4>
+    <h5 class="title is-5">Create new User Token</h5>
     <div class="field is-grouped">
       <div class="control">
         <input class="input is-primary" type="text" placeholder="Token name" v-model="newtokenname">
       </div>
       <button class="button is-primary" @click="createUserToken()">Create Token</button>
     </div>
+    <div v-if="createUserTokenError" class="message is-danger">
+      <div class="message-body">{{ createUserTokenError }}</div>
+    </div>
   </div>
 </template>
 
 <script>
 import {
   fetchCurrentUser,
+  fetchRemoteSources,
   createUserToken,
   deleteUserToken
 } from "@/util/data.js";
@@ -40,33 +47,85 @@ export default {
   props: {},
   data() {
     return {
+      createUserTokenError: null,
+      deleteUserTokenError: null,
       user: [],
+      remotesources: [],
       token: null,
       newtokenname: null
     };
   },
   methods: {
+    resetErrors() {
+      this.createUserTokenError = null;
+      this.deleteUserTokenError = null;
+    },
+    async fetchCurrentUser() {
+      let { data, error } = await fetchCurrentUser();
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.user = data;
+    },
+    async fetchRemoteSources() {
+      let { data, error } = await fetchRemoteSources();
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.remotesources = data;
+    },
     async createUserToken() {
-      let res = await createUserToken(this.user.username, this.newtokenname);
-      this.token = res.token;
+      this.resetErrors();
+
+      let { data, error } = await createUserToken(
+        this.user.username,
+        this.newtokenname
+      );
+      if (error) {
+        this.createUserTokenError = error;
+        return;
+      }
+      this.token = data.token;
       this.newtokenname = null;
-      this.user = await fetchCurrentUser();
+      this.fetchCurrentUser();
     },
     async deleteUserToken(tokenname) {
-      await deleteUserToken(this.user.username, tokenname);
-      this.user = await fetchCurrentUser();
+      this.resetErrors();
+
+      let { error } = await deleteUserToken(this.user.username, tokenname);
+      if (error) {
+        this.deleteUserTokenError = error;
+        return;
+      }
+      this.fetchCurrentUser();
     },
     closeNewTokenNotification() {
       this.token = null;
     }
   },
-  created: async function() {
-    this.user = await fetchCurrentUser();
+  created: function() {
+    this.fetchCurrentUser();
+    this.fetchRemoteSources();
   }
 };
 </script>
 
 <style scoped lang="scss">
 @import "@/css/_variables.scss";
+
+.item-list {
+  .item {
+    margin-bottom: 5px;
+    border: 1px solid $grey-lighter;
+    cursor: pointer;
+    display: flex;
+    padding: 10px;
+  }
+  .name {
+    font-weight: bold;
+  }
+}
 </style>
 
diff --git a/src/router.js b/src/router.js
index e292339..6add202 100644
--- a/src/router.js
+++ b/src/router.js
@@ -21,9 +21,11 @@ import Logout from "./views/Logout.vue";
 
 import { parseRef } from "@/util/link.js";
 
+import store from "./store";
+
 Vue.use(VueRouter);
 
-export default new VueRouter({
+const router = new VueRouter({
   mode: "history",
   routes: [
     {
@@ -327,3 +329,10 @@ export default new VueRouter({
     },
   ]
 });
+
+router.beforeEach((to, from, next) => {
+  store.dispatch("setError", null);
+  next()
+})
+
+export default router
\ No newline at end of file
diff --git a/src/store.js b/src/store.js
index 2ab2d39..3369abf 100644
--- a/src/store.js
+++ b/src/store.js
@@ -4,11 +4,16 @@ import Vuex from 'vuex'
 Vue.use(Vuex)
 
 const state = {
+    error: null,
     user: null,
-    registeruser: null
+    registeruser: null,
 }
 
 const getters = {
+    // global error
+    error: state => {
+        return state.error
+    },
     user: state => {
         return state.user
     },
@@ -18,6 +23,9 @@ const getters = {
 }
 
 const mutations = {
+    setError(state, error) {
+        state.error = error
+    },
     setUser(state, user) {
         state.user = user
     },
@@ -27,6 +35,9 @@ const mutations = {
 }
 
 const actions = {
+    setError({ commit }, error) {
+        commit('setError', error)
+    },
     setUser({ commit }, user) {
         commit('setUser', user)
     },
diff --git a/src/util/auth.js b/src/util/auth.js
index f3efb1d..3f47149 100644
--- a/src/util/auth.js
+++ b/src/util/auth.js
@@ -7,13 +7,13 @@ const USER_KEY = 'user';
 let API_URL = window.CONFIG.API_URL;
 let API_BASE_PATH = window.CONFIG.API_BASE_PATH;
 
-export function login(token, user) {
+export function setLoggedUser(token, user) {
     setIdToken(token);
     setUser(user);
     store.dispatch('setUser', user)
 }
 
-export function logout() {
+export function doLogout() {
     unsetIdToken();
     unsetUser()
     store.dispatch('setUser', null)
@@ -48,6 +48,19 @@ export function oauth2callbackurl() {
     return new URL(API_URL + "/oauth2/callback");
 }
 
+export async function loginapi(init) {
+    if (init === undefined) {
+        init = {}
+    }
+
+    try {
+        let res = await window.fetch(loginurl(), init)
+        return res
+    } catch (e) {
+        throw e
+    }
+}
+
 export async function fetch(url, init) {
     if (init === undefined) {
         init = {}
@@ -60,10 +73,14 @@ export async function fetch(url, init) {
         init.headers["Authorization"] = "bearer " + idToken
     }
 
-    let res = await window.fetch(url, init)
-    if (res.status === 401) {
-        router.push({ name: "login" })
-    } else { return res }
+    try {
+        let res = await window.fetch(url, init)
+        if (res.status === 401) {
+            router.push({ name: "login" })
+        } else { return res }
+    } catch (e) {
+        throw e
+    }
 }
 
 export function setIdToken(idToken) {
diff --git a/src/util/data.js b/src/util/data.js
index 8446fb7..1edcc7c 100644
--- a/src/util/data.js
+++ b/src/util/data.js
@@ -1,9 +1,49 @@
-import { apiurl, fetch } from "@/util/auth";
+import { apiurl, loginapi } from "@/util/auth";
+import { fetch as authfetch } from "@/util/auth";
+
+export async function fetch(url, init) {
+    try {
+        let res = await authfetch(url, init)
+        if (!res.ok) {
+            let data = await res.json()
+            return { data: null, error: data.message }
+        } else {
+            if (res.status == 204) {
+                return { data: null, error: null }
+            }
+            return { data: await res.json(), error: null }
+        }
+    } catch (e) {
+        return { data: null, error: "api call failed: " + e }
+    }
+}
+
+export async function login(username, password, remotesourcename) {
+    let init = {
+        method: "POST",
+        body: JSON.stringify({
+            remote_source_name: remotesourcename,
+            login_name: username,
+            password: password
+        })
+    }
+
+    try {
+        let res = await loginapi(init)
+        if (!res.ok) {
+            let data = await res.json()
+            return { data: null, error: data.message }
+        } else {
+            return { data: await res.json(), error: null }
+        }
+    } catch (e) {
+        return { data: null, error: "api call failed: " + e }
+    }
+}
 
 export async function fetchCurrentUser() {
     let path = "/user"
-    let res = await fetch(apiurl(path));
-    return res.json();
+    return await fetch(apiurl(path));
 }
 
 export async function fetchRuns(group, lastrun) {
@@ -14,25 +54,40 @@ export async function fetchRuns(group, lastrun) {
     if (lastrun) {
         u.searchParams.append("lastrun", true)
     }
-    let res = await fetch(u)
-    return res.json();
+    return await fetch(u)
 }
 
 export async function fetchRun(runid) {
-    let res = await fetch(apiurl("/runs/" + runid));
-    return res.json();
+    return await fetch(apiurl("/runs/" + runid));
 }
 
 export async function fetchTask(runid, taskid) {
-    let res = await fetch(apiurl("/runs/" + runid + "/tasks/" + taskid))
-    return res.json();
+    return await fetch(apiurl("/runs/" + runid + "/tasks/" + taskid))
+}
+
+export async function fetchUser(username) {
+    let path = "/users/" + username
+    return await fetch(apiurl(path));
+}
+
+export async function fetchProjectGroupSubgroups(projectgroupref) {
+    let path = "/projectgroups/" + encodeURIComponent(projectgroupref)
+    path += "/subgroups";
+
+    return await fetch(apiurl(path));
+}
+
+export async function fetchProjectGroupProjects(projectgroupref) {
+    let path = "/projectgroups/" + encodeURIComponent(projectgroupref)
+    path += "/projects";
+
+    return await fetch(apiurl(path));
 }
 
 export async function fetchProject(ref) {
     let path = "/projects/" + encodeURIComponent(ref)
 
-    let res = await fetch(apiurl(path));
-    return res.json();
+    return await fetch(apiurl(path));
 }
 
 export async function fetchVariables(ownertype, ref, all) {
@@ -47,8 +102,7 @@ export async function fetchVariables(ownertype, ref, all) {
     if (all) {
         path += "?tree&removeoverridden";
     }
-    let res = await fetch(apiurl(path));
-    return res.json();
+    return await fetch(apiurl(path));
 }
 
 export async function createUserToken(username, tokenname) {
@@ -59,8 +113,7 @@ export async function createUserToken(username, tokenname) {
             token_name: tokenname,
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function deleteUserToken(username, tokenname) {
@@ -68,8 +121,7 @@ export async function deleteUserToken(username, tokenname) {
     let init = {
         method: "DELETE",
     }
-    let res = await fetch(apiurl(path), init)
-    return res.text();
+    return await fetch(apiurl(path), init)
 }
 
 export async function restartRun(runid, fromStart) {
@@ -81,8 +133,7 @@ export async function restartRun(runid, fromStart) {
             from_start: fromStart
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function stopRun(runid) {
@@ -93,8 +144,7 @@ export async function stopRun(runid) {
             action_type: "stop"
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function approveTask(runid, taskid) {
@@ -105,20 +155,17 @@ export async function approveTask(runid, taskid) {
             action_type: "approve"
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function fetchRemoteSources() {
     let path = "/remotesources"
-    let res = await fetch(apiurl(path));
-    return res.json();
+    return await fetch(apiurl(path));
 }
 
 export async function userRemoteRepos(remotesourceid) {
     let path = "/user/remoterepos/" + remotesourceid
-    let res = await fetch(apiurl(path));
-    return res.json();
+    return await fetch(apiurl(path));
 }
 
 export async function createProjectGroup(parentref, name) {
@@ -131,8 +178,7 @@ export async function createProjectGroup(parentref, name) {
             visibility: "public",
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function createProject(parentref, name, remotesourcename, remoterepopath) {
@@ -147,8 +193,7 @@ export async function createProject(parentref, name, remotesourcename, remoterep
             repo_path: remoterepopath,
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json();
+    return await fetch(apiurl(path), init)
 }
 
 export async function updateProject(projectref, name, visibility) {
@@ -160,8 +205,7 @@ export async function updateProject(projectref, name, visibility) {
             visibility: visibility,
         })
     }
-    let res = await fetch(apiurl(path), init)
-    return res.json()
+    return await fetch(apiurl(path), init)
 }
 
 export async function deleteProject(projectref) {
@@ -169,8 +213,7 @@ export async function deleteProject(projectref) {
     let init = {
         method: "DELETE",
     }
-    let res = await fetch(apiurl(path), init)
-    return res.text();
+    return await fetch(apiurl(path), init)
 }
 
 export async function deleteProjectGroup(projectgroupref) {
@@ -178,6 +221,5 @@ export async function deleteProjectGroup(projectgroupref) {
     let init = {
         method: "DELETE",
     }
-    let res = await fetch(apiurl(path), init)
-    return res.text();
+    return await fetch(apiurl(path), init)
 }
\ No newline at end of file
diff --git a/src/views/Login.vue b/src/views/Login.vue
index 70fa7fa..0268e91 100644
--- a/src/views/Login.vue
+++ b/src/views/Login.vue
@@ -1,17 +1,23 @@
 <template>
   <div>
+    <div v-if="error" class="message is-danger">
+      <div class="message-header">
+        <p>Login error</p>
+      </div>
+      <div class="message-body">{{ error }}</div>
+    </div>
     <div class="column is-4 is-offset-4">
       <div class="box" v-for="rs in remotesources" v-bind:key="rs.id">
         <LoginForm
           action="Login"
           :name="rs.name"
           v-if="rs.auth_type == 'password'"
-          v-on:login="doLogin(rs.name, $event.username, $event.password)"
+          v-on:login="doLogin($event.username, $event.password, rs.name)"
         />
         <button
           v-else
           class="button is-info is-fullwidth"
-          @click="doLogin(rs.name)"
+          @click="doLogin(null, null, rs.name)"
         >Login with {{rs.name}}</button>
       </div>
     </div>
@@ -19,8 +25,8 @@
 </template>
 
 <script>
-import { fetchRemoteSources } from "@/util/data";
-import { loginurl, fetch, login, logout } from "@/util/auth";
+import { fetchRemoteSources, login } from "@/util/data";
+import { setLoggedUser, doLogout } from "@/util/auth";
 
 import LoginForm from "@/components/loginform";
 
@@ -31,34 +37,39 @@ export default {
   },
   data: function() {
     return {
+      error: null,
       remotesources: null
     };
   },
   methods: {
-    async getRemoteSources() {
-      this.remotesources = await fetchRemoteSources();
-    },
-    async doLogin(rsName, username, password) {
-      let u = loginurl();
-      let res = await (await fetch(u, {
-        method: "POST",
-        body: JSON.stringify({
-          remote_source_name: rsName,
-          login_name: username,
-          password: password
-        })
-      })).json();
-      if (res.oauth2_redirect) {
-        window.location = res.oauth2_redirect;
+    async fetchRemoteSources() {
+      let { data, error } = await fetchRemoteSources();
+      if (error) {
+        this.$store.dispatch("setError", error);
         return;
       }
-      login(res.token, res.user);
+      this.remotesources = data;
+    },
+    async doLogin(username, password, remotesourcename) {
+      this.error = null;
+
+      let { data, error } = await login(username, password, remotesourcename);
+      if (error) {
+        // set local login error on failed login.
+        this.error = error;
+        return;
+      }
+      if (data.oauth2_redirect) {
+        window.location = data.oauth2_redirect;
+        return;
+      }
+      setLoggedUser(data.token, data.user);
       this.$router.push({ name: "home" });
     }
   },
   created: function() {
-    logout();
-    this.getRemoteSources();
+    doLogout();
+    this.fetchRemoteSources();
   }
 };
 </script>
diff --git a/src/views/Logout.vue b/src/views/Logout.vue
index 8a7bde5..921b5b5 100644
--- a/src/views/Logout.vue
+++ b/src/views/Logout.vue
@@ -1,10 +1,10 @@
 <script>
-import { logout } from "@/util/auth";
+import { doLogout } from "@/util/auth";
 
 export default {
   name: "Logout",
   created: function() {
-    logout();
+    doLogout();
     this.$router.push("/");
   }
 };
diff --git a/src/views/Oauth2.vue b/src/views/Oauth2.vue
index e993693..88bcaf7 100644
--- a/src/views/Oauth2.vue
+++ b/src/views/Oauth2.vue
@@ -1,12 +1,18 @@
 <template>
   <div>
-    <div>{{code}}</div>
-    <div>{{username}}</div>
+    <div v-if="error" class="message is-danger">
+      <div class="message-header">
+        <p>Error</p>
+      </div>
+      <div class="message-body">{{ error }}</div>
+    </div>
   </div>
 </template>
 
 <script>
-import { oauth2callbackurl, login, fetch } from "@/util/auth";
+import { fetch } from "@/util/data";
+
+import { oauth2callbackurl, setLoggedUser } from "@/util/auth";
 
 export default {
   components: {},
@@ -14,6 +20,7 @@ export default {
   props: {},
   data() {
     return {
+      error: null,
       run: null,
       code: this.$route.query.code,
       polling: null,
@@ -25,12 +32,18 @@ export default {
       let u = oauth2callbackurl();
       u.searchParams.append("code", this.$route.query.code);
       u.searchParams.append("state", this.$route.query.state);
-      let res = await (await fetch(u)).json();
-      if (res.request_type === "loginuser") {
-        login(res.response.token, res.response.user);
+      let { data, error } = await fetch(u);
+      if (error) {
+        // set local login error on failed oauth2.
+        this.error = error;
+        return;
+      }
+
+      if (data.request_type === "loginuser") {
+        setLoggedUser(data.response.token, data.response.user);
         this.$router.push("/");
-      } else if (res.request_type === "authorize") {
-        this.$store.dispatch("setRegisterUser", res.response);
+      } else if (data.request_type === "authorize") {
+        this.$store.dispatch("setRegisterUser", data.response);
         this.$router.push("/register");
       }
     }
diff --git a/src/views/Project.vue b/src/views/Project.vue
index fe89476..9df9349 100644
--- a/src/views/Project.vue
+++ b/src/views/Project.vue
@@ -134,7 +134,12 @@ export default {
   watch: {
     $route: async function(route) {
       if (route.params.runid) {
-        this.run = await fetchRun(route.params.runid);
+        let { data, error } = await fetchRun(route.params.runid);
+        if (error) {
+          this.$store.dispatch("setError", error);
+          return;
+        }
+        this.run = data;
       }
     }
   },
@@ -153,7 +158,12 @@ export default {
   },
   created: async function() {
     if (this.$route.params.runid) {
-      this.run = await fetchRun(this.$route.params.runid);
+      let { data, error } = await fetchRun(this.$route.params.runid);
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.run = data;
     }
   }
 };
diff --git a/src/views/ProjectGroup.vue b/src/views/ProjectGroup.vue
index 9e93801..a598f42 100644
--- a/src/views/ProjectGroup.vue
+++ b/src/views/ProjectGroup.vue
@@ -51,8 +51,6 @@ import {
   projectGroupCreateProjectLink
 } from "@/util/link.js";
 
-import { fetchRun } from "@/util/data.js";
-
 import projbreadcrumbs from "@/components/projbreadcrumbs.vue";
 import createprojectbutton from "@/components/createprojectbutton.vue";
 
@@ -64,18 +62,6 @@ export default {
     ownername: String,
     projectgroupref: Array
   },
-  data() {
-    return {
-      run: null
-    };
-  },
-  watch: {
-    $route: async function(route) {
-      if (route.params.runid) {
-        this.run = await fetchRun(route.params.runid);
-      }
-    }
-  },
   methods: {
     projectGroupProjectsLink: projectGroupProjectsLink,
     projectGroupSettingsLink: projectGroupSettingsLink,
@@ -103,11 +89,6 @@ export default {
         )
       );
     }
-  },
-  created: async function() {
-    if (this.$route.params.runid) {
-      this.run = await fetchRun(this.$route.params.runid);
-    }
   }
 };
 </script>
diff --git a/src/views/Register.vue b/src/views/Register.vue
index 0ca1f84..9d0f091 100644
--- a/src/views/Register.vue
+++ b/src/views/Register.vue
@@ -31,7 +31,9 @@ import { mapGetters } from "vuex";
 import LoginForm from "@/components/loginform";
 import RegisterForm from "@/components/registerform";
 
-import { apiurl, authorizeurl, registerurl, fetch, logout } from "@/util/auth";
+import { fetchRemoteSources } from "@/util/data";
+
+import { authorizeurl, registerurl, fetch, doLogout } from "@/util/auth";
 
 export default {
   name: "Register",
@@ -48,9 +50,13 @@ export default {
     ...mapGetters(["registeruser"])
   },
   methods: {
-    async getRemoteSources() {
-      let res = await (await fetch(apiurl("/remotesources"))).json();
-      this.remotesources = res;
+    async fetchRemoteSources() {
+      let { data, error } = await fetchRemoteSources();
+      if (error) {
+        this.$store.dispatch("setError", error);
+        return;
+      }
+      this.remotesources = data;
     },
     async doAuthorize(rsName, username, password) {
       let u = authorizeurl();
@@ -99,8 +105,8 @@ export default {
     }
   },
   created: function() {
-    logout();
-    this.getRemoteSources();
+    doLogout();
+    this.fetchRemoteSources();
   }
 };
 </script>
diff --git a/src/views/User.vue b/src/views/User.vue
index b1042f6..0feb2d5 100644
--- a/src/views/User.vue
+++ b/src/views/User.vue
@@ -117,7 +117,12 @@ export default {
   watch: {
     $route: async function(route) {
       if (route.params.runid) {
-        this.run = await fetchRun(route.params.runid);
+        let { data, error } = await fetchRun(route.params.runid);
+        if (error) {
+          this.$store.dispatch("setError", error);
+          return;
+        }
+        this.run = data;
       }
     }
   },