jMock

A mock server for JS, support HTTP methods and Websocket

Install

npm install @8pattern/jmock

Usage

MockData Difination

The MockData is defined as following:

{
	[Path]: {
		[Method1]: [MockItem1],
		[Method2]: [MockItem2],
	},
	[Path2]: { ... }
}

For example:

{
	'/mock/item/:productName': {
		GET: '@name',
		POST: function(cb, req, param) {
			if (req.id) {
				cb({ id: req.id, name: param.productName })
			} else {
				cb({ desc: 'error' })
			}
		}
	},
	'/mock/item2/.*': {
		PUT: {
			'name|+1': number
		}
	},
	'/ws/mock': {
		WS: (cb, req) => {
		    if (req.id) {
			cb('@name')
		    }
		}
	}
}

• Path <string>

  1. It can receive an exact, fuzzy or regular expression pattern to match the request url.

     • Exact: the url must match the whole pattern, e.g., "/a/b"
     • Fuzzy: support ":<name>" or "*" to match the url.

     • :<name>： match only a sub route, i.e. "/:url" can match "/a", but can NOT match "/a/b"
     • *: match any routes, i.e., "/route/*" can match "/route/1" and "/route/1/2", but can NOT match "/1/2"

     • Reg: use regular expressions as the pattern, i.e., "/(.*?)/(?<id>.>?)"

     • Be aware NOT define it as RegExp directly, i.e., use 'a/b/.*' rather than /a/b/.*/. (Because object can't receive RegExp as a key.)

  2. The matched string can be found from the third argument of function.

     // URL: /a/b
     // PATTERN: "/:r1/*" or "/(?<r1>.*)/(.*)"
     (cb, req, param) => {
     	console.log(
     		param[0], // "a"
     		param[1], // "b"
     		param.r1, // "a"
     	)
     } 

  3. priority: Exact > Fuzzy > Reg

• Method<string>

  1. All HTTP methods supported by Express.js also SUPPORTED by us.

  2. Particularly, WS will be used to present the websocket method.

• MockItem: <string> | <object> | <array> | <function>

  1. string / object / array

  'hello world' | { hello: 'world' } | ['hello', 'world']

  Thanks to mockjs, which provides a wonderful data generator, ALL its template strings will also work well in jMock. For example:

  '@name' => "Sharon Walker"
  { "number|1-100": 100 } => { "number": 201 }

  2. function

     • argument: callback<function>, reqParams<object> routeParams<object>
     • return：

  	function(cb, req, param) {
  		if(req.id === 0) {
  			cb('success')
  		} else if (param.name) {
  			cb('success')
  		} else {
  			setTimeout(() => {
  				cb('fail')
  			}, 200)
  		}
  	}

  The callback function also receive a MockItem (except function) as the only argument, so the grammer of mockjs also works. For example:

   (cb) => {
      cb({ name: '@name' })
   }
   // same as { name: '@name' }

Run as CMD

1. firstly, you should prepare a mock data file, and export it by CommonJS. For example:

module.exports = {
	'/mock/name': {
        'GET': '@name'
    }
}

2. then, code the command in the shell.

jmock [--file=./mockdata.js] [--port=3000]

Two arguments should be defined:

• mock file: --file or -f
  1. e.g., --file=./mockdata.js.
  2. if not asign it, the mock data will be {} by default
• port: --port or -p
  1. e.g., --port=3001
  2. 3000 by default

Run as Script

const JMock = require('@8pattern/jmock')

const port = 3000
const mockData = {
	'/mock/name': {
        'GET': '@name'
    }
}

const jmock = new JMock(data)
jmock.start(port)

ENJOY YOUR MOCK DATA NOW!