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JSON Server

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

Created with <3 for front-end developers who need a quick back-end for prototyping and mocking.

Note

Try JSON Server v1-alpha here 🚀

See also:

🐶 husky - Git hooks made easy
🦉 lowdb - local JSON database

Become a sponsor and have your company logo here

Please help me build OSS 👉 GitHub Sponsors ❤️

Install JSON Server

npm install -g json-server@0.17.4    # NPM
yarn global add json-server@0.17.4   # Yarn
pnpm add -g json-server@0.17.4       # PNPM

Create a db.json file with some data

{
  "posts": [
    { "id": 1, "title": "json-server", "author": "typicode" }
  ],
  "comments": [
    { "id": 1, "body": "some comment", "postId": 1 }
  ],
  "profile": { "name": "typicode" }
}

Start JSON Server

json-server --watch db.json

Now if you go to http://localhost:3000/posts/1, you'll get

{ "id": 1, "title": "json-server", "author": "typicode" }

Also when doing requests, it's good to know that:

If you make POST, PUT, PATCH or DELETE requests, changes will be automatically and safely saved to db.json using lowdb.
Your request body JSON should be object enclosed, just like the GET output. (for example {"name": "Foobar"})
Id values are not mutable. Any id value in the body of your PUT or PATCH request will be ignored. Only a value set in a POST request will be respected, but only if not already taken.
A POST, PUT or PATCH request should include a Content-Type: application/json header to use the JSON in the request body. Otherwise it will return a 2XX status code, but without changes being made to the data.

Based on the previous db.json file, here are all the default routes. You can also add other routes using --routes.

GET    /posts
GET    /posts/1
POST   /posts
PUT    /posts/1
PATCH  /posts/1
DELETE /posts/1

GET    /profile
POST   /profile
PUT    /profile
PATCH  /profile

Use . to access deep properties

GET /posts?title=json-server&author=typicode
GET /posts?id=1&id=2
GET /comments?author.name=typicode

Use _page and optionally _limit to paginate returned data.

In the Link header you'll get first, prev, next and last links.

GET /posts?_page=7
GET /posts?_page=7&_limit=20

10 items are returned by default

Add _sort and _order (ascending order by default)

GET /posts?_sort=views&_order=asc
GET /posts/1/comments?_sort=votes&_order=asc

For multiple fields, use the following format:

GET /posts?_sort=user,views&_order=desc,asc

Add _start and _end or _limit (an X-Total-Count header is included in the response)

GET /posts?_start=20&_end=30
GET /posts/1/comments?_start=20&_end=30
GET /posts/1/comments?_start=20&_limit=10

Works exactly as Array.slice (i.e. _start is inclusive and _end exclusive)

Add _gte or _lte for getting a range

GET /posts?views_gte=10&views_lte=20

Add _ne to exclude a value

Add _like to filter (RegExp supported)

GET /posts?title_like=server

Add q

To include children resources, add _embed

GET /posts?_embed=comments
GET /posts/1?_embed=comments

To include parent resource, add _expand

GET /comments?_expand=post
GET /comments/1?_expand=post

To get or create nested resources (by default one level, add custom routes for more)

GET  /posts/1/comments
POST /posts/1/comments

Returns default index file or serves ./public directory

You can use JSON Server to serve your HTML, JS and CSS, simply create a ./public directory or use --static to set a different static files directory.

mkdir public
echo 'hello world' > public/index.html
json-server db.json

json-server db.json --static ./some-other-dir

You can start JSON Server on other ports with the --port flag:

$ json-server --watch db.json --port 3004

You can access your fake API from anywhere using CORS and JSONP.

You can load remote schemas.

$ json-server http://example.com/file.json
$ json-server http://jsonplaceholder.typicode.com/db

Using JS instead of a JSON file, you can create data programmatically.

// index.js
module.exports = () => {
  const data = { users: [] }
  // Create 1000 users
  for (let i = 0; i < 1000; i++) {
    data.users.push({ id: i, name: `user${i}` })
  }
  return data
}

Tip use modules like Faker, Casual, Chance or JSON Schema Faker.

There are many ways to set up SSL in development. One simple way is to use hotel.

Create a routes.json file. Pay attention to start every route with /.

{
  "/api/*": "/$1",
  "/:resource/:id/show": "/:resource/:id",
  "/posts/:category": "/posts?category=:category",
  "/articles?id=:id": "/posts/:id"
}

Start JSON Server with --routes option.

json-server db.json --routes routes.json

Now you can access resources using additional routes.

/api/posts # → /posts
/api/posts/1  # → /posts/1
/posts/1/show # → /posts/1
/posts/javascript # → /posts?category=javascript
/articles?id=1 # → /posts/1

You can add your middlewares from the CLI using --middlewares option:

// hello.js
module.exports = (req, res, next) => {
  res.header('X-Hello', 'World')
  next()
}

json-server db.json --middlewares ./hello.js
json-server db.json --middlewares ./first.js ./second.js

json-server [options] <source>

Options:
  --config, -c       Path to config file           [default: "json-server.json"]
  --port, -p         Set port                                    [default: 3000]
  --host, -H         Set host                             [default: "localhost"]
  --watch, -w        Watch file(s)                                     [boolean]
  --routes, -r       Path to routes file
  --middlewares, -m  Paths to middleware files                           [array]
  --static, -s       Set static files directory
  --read-only, --ro  Allow only GET requests                           [boolean]
  --no-cors, --nc    Disable Cross-Origin Resource Sharing             [boolean]
  --no-gzip, --ng    Disable GZIP Content-Encoding                     [boolean]
  --snapshots, -S    Set snapshots directory                      [default: "."]
  --delay, -d        Add delay to responses (ms)
  --id, -i           Set database id property (e.g. _id)         [default: "id"]
  --foreignKeySuffix, --fks  Set foreign key suffix, (e.g. _id as in post_id)
                                                                 [default: "Id"]
  --quiet, -q        Suppress log messages from output                 [boolean]
  --help, -h         Show help                                         [boolean]
  --version, -v      Show version number                               [boolean]

Examples:
  json-server db.json
  json-server file.js
  json-server http://example.com/db.json

https://github.com/typicode/json-server

You can also set options in a json-server.json configuration file.

If you need to add authentication, validation, or any behavior, you can use the project as a module in combination with other Express middlewares.

$ npm install json-server --save-dev

// server.js
const jsonServer = require('json-server')
const server = jsonServer.create()
const router = jsonServer.router('db.json')
const middlewares = jsonServer.defaults()

server.use(middlewares)
server.use(router)
server.listen(3000, () => {
  console.log('JSON Server is running')
})

The path you provide to the jsonServer.router function is relative to the directory from where you launch your node process. If you run the above code from another directory, it’s better to use an absolute path:

const path = require('path')
const router = jsonServer.router(path.join(__dirname, 'db.json'))

For an in-memory database, simply pass an object to jsonServer.router().

To add custom options (eg. foreginKeySuffix) pass in an object as the second argument to jsonServer.router('db.json', { foreginKeySuffix: '_id' }).

Please note also that jsonServer.router() can be used in existing Express projects.

Let's say you want a route that echoes query parameters and another one that set a timestamp on every resource created.

const jsonServer = require('json-server')
const server = jsonServer.create()
const router = jsonServer.router('db.json')
const middlewares = jsonServer.defaults()

// Set default middlewares (logger, static, cors and no-cache)
server.use(middlewares)

// Add custom routes before JSON Server router
server.get('/echo', (req, res) => {
  res.jsonp(req.query)
})

// To handle POST, PUT and PATCH you need to use a body-parser
// You can use the one used by JSON Server
server.use(jsonServer.bodyParser)
server.use((req, res, next) => {
  if (req.method === 'POST') {
    req.body.createdAt = Date.now()
  }
  // Continue to JSON Server router
  next()
})

// Use default router
server.use(router)
server.listen(3000, () => {
  console.log('JSON Server is running')
})

const jsonServer = require('json-server')
const server = jsonServer.create()
const router = jsonServer.router('db.json')
const middlewares = jsonServer.defaults()

server.use(middlewares)
server.use((req, res, next) => {
 if (isAuthorized(req)) { // add your authorization logic here
   next() // continue to JSON Server router
 } else {
   res.sendStatus(401)
 }
})
server.use(router)
server.listen(3000, () => {
  console.log('JSON Server is running')
})

To modify responses, overwrite router.render method:

// In this example, returned resources will be wrapped in a body property
router.render = (req, res) => {
  res.jsonp({
    body: res.locals.data
  })
}

You can set your own status code for the response:

// In this example we simulate a server side error response
router.render = (req, res) => {
  res.status(500).jsonp({
    error: "error message here"
  })
}

To add rewrite rules, use jsonServer.rewriter():

// Add this before server.use(router)
server.use(jsonServer.rewriter({
  '/api/*': '/$1',
  '/blog/:resource/:id/show': '/:resource/:id'
}))

Mounting JSON Server on another endpoint example

Alternatively, you can also mount the router on /api.

server.use('/api', router)

jsonServer.create()

Returns an Express server.

jsonServer.defaults([options])

Returns middlewares used by JSON Server.

options
- static path to static files
- logger enable logger middleware (default: true)
- bodyParser enable body-parser middleware (default: true)
- noCors disable CORS (default: false)
- readOnly accept only GET requests (default: false)

jsonServer.router([path|object], [options])

Returns JSON Server router.

options (see CLI usage)

You can deploy JSON Server. For example, JSONPlaceholder is an online fake API powered by JSON Server and running on Heroku.

Creating Demo APIs with json-server on egghead.io

MIT

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