jaymock

Minimal fake JSON test data generator.

Install

~ ❯❯❯ npm install @meeshkanml/jaymock

Usage

const jaymock = require('@meeshkanml/jaymock')

const data = {
  firstName: 'name.firstName',
  lastName: 'name.lastName',
  ssn: 'ssn',
  address: {
    streetAddress: 'address.streetAddress',
    city: 'address.city',
    zipCode: 'address.zipCode'
  },
  emails: 'internet.email',
  ipAddress: 'internet.ip',
  _repeat: 2
}

const jm = jaymock()

const randExp = require('randexp').randexp
// Add custom functions using `.extend()`
jm.extend({
  ssn: () => randExp(/^\d{3}-\d{2}-\d{4}$/)
})

const fakeData = jm.populate(data)
/*
  [
    {
      firstName: 'Marguerite',
      lastName: 'Will',
      ssn: '076-86-6001',
      address: {
        streetAddress: '4509 Abernathy Port',
        city: 'Port Charles',
        zipCode: '26322'
      },
      emails: '[email protected]',
      ipAddress: '44.210.55.248'
    },
    {
      firstName: 'Fredrick',
      lastName: 'McClure',
      ssn: '610-42-4980',
      address: {
        streetAddress: '56363 Goyette Station',
        city: 'West Floydmouth',
        zipCode: '73634-6751'
      },
      emails: '[email protected]',
      ipAddress: '237.7.221.162'
    }
  ]
*/

Mock API using express

const jaymock = require('@meeshkanml/jaymock')
const express = require('express')

app = express()
app.use(express.json())

const jm = jaymock()
jm.extend('chance', new require('chance')())

app.post('/', (req, res) => res.json(jm.populate(req.body)))

app.listen(3000)

API

.populate(template)

Returns an object, populated with fake data.

template

Type: object

Each object's value can be one of Faker.js's API methods, in the format '{topic}.{subtopic}' (e.g. 'name.firstName') or a custom method, defined using the .extend function, in the format '{function_name}' or {function_name}.{nested_function_name} (e.g. 'foo' will call foo() and 'foo.bar' will call foo.bar()).

A fake value can be generated n times, into an array of n values, by including |n at the end of the individual object's method name (e.g. 'name.firstName|5' will generate an array, populated with 5 fake first names). This also works with custom functions, accordingly.

To use the faker.fake() method (which permits the combination of faker API methods), use the format 'fake({mustache_strings})' (e.g. 'fake({{name.lastName}}, {{name.firstName}} {{name.suffix}})').

.extend(name, body)

Adds a custom data generation function that can be called in the .populate template using the value of name.

name

Type: string

body

Type: function

.extend(functions)

Adds custom data generation functions that can be called in the .populate template using the value of each object key.

functions

Type: object

Each object key should be the relevant function's name and value the function's body (e.g. { 'chance': new require('chance')() }).

.setFakerLocale(locale)

Sets Faker.js's language locale.

locale

Type: string

Any of Faker.js's locale options.

.setFakerSeed(seed)

Sets Faker.js's randomness seed.

seed

Type: number

Related

• micro-jaymock - Tiny API mocking microservice, which uses jaymock
• jaymock-cli - CLI for this module

Contributing

Thanks for wanting to contribute! We will soon have a contributing page detailing how to contribute. Meanwhile, feel free to star this repository, open issues, and ask for more features and support.

Please note that this project is governed by the Meeshkan Community Code of Conduct. By participating in this project, you agree to abide by its terms.

Credits

• Faker.js is used as jaymock's core fake data generator.

License

MIT © Meeshkan