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

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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.

See also: * :dog: husky - Git hooks made easy * :hotel: hotel - developer tool with local .localhost domain and https out of the box

 

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Table of contents

Getting started

Install JSON Server

npm install -g json-server

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.

Routes

Based on the previous

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

Plural routes

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

Singular routes

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

Filter

Use

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

Paginate

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

Sort

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

Slice

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)

Operators

Add

_gte
or
_lte
for getting a range
GET /posts?views_gte=10&views_lte=20

Add

_ne
to exclude a value
GET /posts?id_ne=1

Add

_like
to filter (RegExp supported)
GET /posts?title_like=server

Full-text search

Add

q
GET /posts?q=internet

Relationships

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

Database

GET /db

Homepage

Returns default index file or serves

./public
directory
GET /

Extras

Static file server

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

Alternative port

You can start JSON Server on other ports with the

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

Access from anywhere

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

Remote schema

You can load remote schemas.

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

Generate random data

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
}
$ json-server index.js

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

HTTPS

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

Add custom routes

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

Add middlewares

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

CLI usage

json-server [options] 

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.
{
  "port": 3000
}

Module

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

Simple example

$ 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') })

$ node server.js

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()
.

Please note also that

jsonServer.router()
can be used in existing Express projects.

Custom routes example

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') })

Access control example

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') })

Custom output example

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"
  })
}

Rewriter example

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)

API

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])

Returns JSON Server router.

Deployment

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

Links

Video

Articles

Third-party tools

License

MIT

Supporters

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