Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

rehydrate: true option gives error

See original GitHub issue

Operating System: Manjaro Linux 17.0.5 Kernel: 4.9.51-1-MANJARO Node: 8.5.0 NPM: 5.4.2 Browser: Chromium 61.0.3163.91 Angular: 4.4.3 ngrx/store: 4.0.3 ngrx-store-localstorage: 0.2.2 zone.js: 0.8.17

My app works fine, but when I add the rehydrate: true option, I get the error below when I try to refresh the page after I’ve logged in. I can provide more code or information if required.

Sample reducer

import * as OrganizationActions from '../actions/organization';

const initialState = '';

export function reducer(state: string = initialState, action: OrganizationActions.Actions): string {
  switch (action.type) {
    case OrganizationActions.ActionTypes.SET_ORGANIZATION:
      return action.payload;
      return state;

Sample action

import { Action } from '@ngrx/store';

export const ActionTypes = {

export class SetOrganizationAction implements Action {
  readonly type = ActionTypes.SET_ORGANIZATION;
  constructor(public payload: string) { }

export type Actions = SetOrganizationAction;

Main reducer file

import * as Assessment from '../reducers/assessment';
import * as Organization from '../reducers/organization';
import * as Person from '../reducers/person';
import * as Team from '../reducers/team';
import * as Token from '../reducers/token';

import { ActionReducer, ActionReducerMap, MetaReducer } from '@ngrx/store';

import { State } from './../../models/state';
import { localStorageSync } from 'ngrx-store-localstorage';

export const appReducers: ActionReducerMap<State> = {
  token: Token.reducer,
  organization: Organization.reducer,
  team: Team.reducer,
  person: Person.reducer,
  assessment: Assessment.reducer

const localStorageSyncReducer = localStorageSync({
  keys: ['token', 'organization', 'team', 'person', 'assessment'],
  rehydrate: true

export function localStorageSyncMetaReducer(reducer: ActionReducer<any>): ActionReducer<any> {
  return localStorageSyncReducer(reducer);

export const metaReducers: MetaReducer<any>[] = [localStorageSyncMetaReducer];


Unhandled Promise rejection: Unexpected token c in JSON at position 0 ; Zone: <root> ; Task: Promise.then ; Value: SyntaxError: Unexpected token c in JSON at position 0
    at Object.parse (<anonymous>)
    at vendor.bundle.js:10876
    at Array.reduce (<anonymous>)
    at Object.webpackJsonp.../../../../ngrx-store-localstorage/dist/index.js.exports.rehydrateApplicationState (vendor.bundle.js:10835)
    at vendor.bundle.js:10961
    at localStorageSyncMetaReducer (main.bundle.js:3238)
    at vendor.bundle.js:7072
    at Array.reduceRight (<anonymous>)
    at vendor.bundle.js:7072
    at new ReducerManager (vendor.bundle.js:7170) SyntaxError: Unexpected token c in JSON at position 0
    at Object.parse (<anonymous>)
    at http://localhost:4200/vendor.bundle.js:10876:28
    at Array.reduce (<anonymous>)
    at Object.webpackJsonp.../../../../ngrx-store-localstorage/dist/index.js.exports.rehydrateApplicationState (http://localhost:4200/vendor.bundle.js:10835:17)
    at http://localhost:4200/vendor.bundle.js:10961:54
    at localStorageSyncMetaReducer (http://localhost:4200/main.bundle.js:3238:12)
    at http://localhost:4200/vendor.bundle.js:7072:66
    at Array.reduceRight (<anonymous>)
    at http://localhost:4200/vendor.bundle.js:7072:21
    at new ReducerManager (http://localhost:4200/vendor.bundle.js:7170:39)

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Reactions:1
  • Comments:5 (2 by maintainers)

github_iconTop GitHub Comments

ernestomancebocommented, Oct 9, 2017

I’m taking a look into this

btronconecommented, Oct 10, 2017

Publishing a new release now 👍

Read more comments on GitHub >

github_iconTop Results From Across the Web

browser.hydrate: false breaks client-side router #4382 - GitHub
The first problem is that hydrate: true is unconditionally set in the code (where root.svelte is generated). Setting this to false for testing ......
Read more >
react-hydration-error - Next.js
In general this issue is caused by using a specific library or application code that is relying on something that could differ between...
Read more >
How to solve react hydration error in Nextjs - Stack Overflow
in Nextjs react-hydration-error occurs when the SSR content not match in the browser or the the third party library altering the state in ......
Read more >
The Perils of Rehydration - Josh W Comeau
When this value is true , the "real" content gets rendered. The difference from our earlier solution: useEffect only fires after the component ......
Read more >
Rehydrating from Archives - Datadog Docs
Log Rehydration* enables you to capture log events from customer-owned storage-optimized archives back into Datadog's search-optimized Log Explorer, so that you ...
Read more >

github_iconTop Related Medium Post

No results found

github_iconTop Related StackOverflow Question

No results found

github_iconTroubleshoot Live Code

Lightrun enables developers to add logs, metrics and snapshots to live code - no restarts or redeploys required.
Start Free

github_iconTop Related Reddit Thread

No results found

github_iconTop Related Hackernoon Post

No results found

github_iconTop Related Tweet

No results found

github_iconTop Related Post

No results found

github_iconTop Related Hashnode Post

No results found