1.0.7 • Public • Published

JSON+HAL REST Data Provider For React-Admin

JSON+HAL REST Data Provider for react-admin, the frontend framework for building admin applications on top of REST/GraphQL services.

react-admin demo


npm install --save ra-data-json-hal

REST Dialect

This Data Provider fits REST APIs using simple GET parameters for filters and sorting. This is the dialect used for instance in FakeRest.

REST verb API calls
GET_LIST GET http://example.com/api/posts?name.dir=DESC&page=1&published=true&size=10&sort=name
GET_ONE GET http://example.com/api/posts/50
CREATE POST http://example.com/api/posts
UPDATE PUT http://example.com/api/posts/50
DELETE DELETE http://example.com/api/posts/50
GET_MANY Makes a GET_ONE for each id request.
GET_MANY_REFERENCE GET http://example.com/api/posts/50/comments

Note: This data provider expects a Location header to be present in the response for the requests made using the POST or PATCH methods.

Location: http://example.com/api/posts/50


// in src/App.js
import React from 'react';
import { Admin, Resource } from 'react-admin';
import jsonHalRestProvider from 'ra-data-json-hal';
import { PostList } from './posts';
const App = () => (
    <Admin dataProvider={jsonHalRestProvider('http://path.to.my.api/')}>
        <Resource name="posts" list={PostList} />
export default App;

Adding Custom Headers

The provider function accepts an HTTP client function as second argument. By default, they use react-admin's fetchUtils.fetchJson() as HTTP client. It's similar to HTML5 fetch(), except it handles JSON decoding and HTTP error codes automatically.

That means that if you need to add custom headers to your requests, you just need to wrap the fetchJson() call inside your own function:

import { fetchUtils, Admin, Resource } from 'react-admin';
import jsonHalRestProvider from 'ra-data-json-hal';
const httpClient = (url, options = {}) => {
    if (!options.headers) {
        options.headers = new Headers({ Accept: 'application/json' });
    // add your own headers here
    options.headers.set('X-Custom-Header', 'foobar');
    return fetchUtils.fetchJson(url, options);
const dataProvider = jsonHalRestProvider('http://localhost:3000', httpClient);
    <Admin dataProvider={dataProvider} title="Example Admin">

Now all the requests to the REST API will contain the X-Custom-Header: foobar header.

Tip: The most common usage of custom headers is for authentication. fetchJson has built-on support for the Authorization token header:

const httpClient = (url, options = {}) => {
    options.user = {
        authenticated: true,
    return fetchUtils.fetchJson(url, options);

Now all the requests to the REST API will contain the Authorization: SRTRDFVESGNJYTUKTYTHRG header.


This data provider is licensed under the MIT License, and sponsored by applaudo studios.

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