Serves JSON files through REST routes.

npm install json-server
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JSON Server

Give it a JSON or JS seed file and it will serve it through REST routes.

Created with :heart: for front-end developers who need a flexible back-end for quick prototyping and mocking.

Build Status NPM version


Command line interface

// db.json
  "posts": [
    { "id": 1, "body": "foo" }
$ json-server --file db.json
$ curl -i http://localhost:3000/posts/1

Node module

var server = require('json-server');

server.low.db = { 
  posts: [
    { id: 1, body: 'foo' }

server.get('/another/route', function(req, res, next) {
  // ...


You can find a running demo here: http://jsonplaceholder.typicode.com.


  • Lets you use plain JSON or simple JS file
  • Supports GET but also POST, PUT, DELETE and even PATCH requests
  • Can be used from anywhere through cross domain requests (JSONP or CORS)
  • Can load remote JSON files
  • Can be deployed on Nodejitsu, Heroku, ...


$ npm install -g json-server


Command line interface

  Usage: json-server <source> [options]


    --version      output version
    --port <port>  set port


    json-server db.json
    json-server seed.js
    json-server http://example.com/db.json


Here's 2 examples showing how to format JSON or JS seed file:

  • db.json
  "posts": [
    { "id": 1, "body": "foo" },
    { "id": 2, "body": "bar" }
  "comments": [
    { "id": 1, "body": "baz", "postId": 1 }
    { "id": 2, "body": "qux", "postId": 2 }
  • seed.js
exports.run = function() {
  var data = {};

  data.posts = [];
  data.posts.push({ id: 1, body: 'foo' });

  return data;

JSON Server expects JS files to export a run method that returns an object.

Seed files are useful if you need to programmaticaly create a lot of data.

Node module

run(db, [options])

var server = require('json-server'),
    db = require('./seed').run();

var options = { port: 4000, readOnly: true };

server.run(db, options);

By default, port is set to 3000 and readOnly to false.


GET   /:resource
GET   /:resource?filter=&filter=&
GET   /:parent/:parentId/:resource
GET   /:resource/:id
POST  /:resource
PUT   /:resource/:id
PATCH /:resource/:id
DEL   /:resource/:id

To slice resources, add _start and _end to query parameters.

For routes usage information, have a look at JSONPlaceholder code examples.

GET /db

Returns database state.


Returns default index file or content of ./public/index.html (useful if you need to set a custom home page).


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