joi-to-json

Objective

I have been using joi a lot in different Node.js projects which guards the API. It's The most powerful schema description language and data validator for JavaScript. as it said.

Many times, we need to utilize this schema description to produce other output, such as Swagger OpenAPI doc. That is why I build joi-route-to-swagger in the first place.

At the beginning, joi-route-to-swagger relies on joi-to-json-schema which utilizes many joi internal api or properties. I believed there was reason. Maybe joi did not provide the describe api way before. But I always feel not comfortable and think it's time to move on.

The intention of joi-to-json is to support converting different version's joi schema to JSON Schema (draft-04) using describe api.

Installation

npm install joi-to-json

Joi Version Support

@commercial/joi
- v12.1.0
joi
- 13.7.0
- 14.3.1
@hapi/joi
- 15.1.1
- 16.1.8
- 17.1.0

For all above version, I have tested one complex joi object fixtures which covers most of the JSON schema attributes that can be described in joi schema.

Although the versions chosen are the latest one for each major version, I believe it should be supporting other minor version as well.

Usage

Only one API convert is available.

You can optionally provide debug flag true as the second argument to check which version of the parser is chosen and the joi schema describe output

const convert = require('joi-to-json')

const joiSchema = joi.object().keys({
  nickName: joi.string().required().min(3).max(20).example('鹄思乱想').description('Hero Nickname')
    .regex(/^[a-z]+$/, { name: 'alpha', invert: true }),
  avatar: joi.string().required().uri(),
  email: joi.string().email(),
  ip: joi.string().ip({ version: ['ipv4', 'ipv6'] }),
  hostname: joi.string().hostname().insensitive(),
  gender: joi.string().valid('Male', 'Female', '').default('Male'),
  height: joi.number().precision(2).positive().greater(0).less(200),
  birthday: joi.date().iso(),
  birthTime: joi.date().timestamp('unix'),
  skills: joi.array().items(joi.alternatives().try(
    joi.string(),
    joi.object().keys({
      name: joi.string().example('teleport').alphanum().lowercase().required().description('Skill Name'),
      level: joi.number().integer().min(10).max(100).default(50).multiple(10).example(10).description('Skill Level')
    })
  ).required()).min(1).max(3).unique().description('Skills'),
  tags: joi.array().items(joi.string().required()).length(2),
  retired: joi.boolean().truthy('yes').falsy('no').insensitive(false),
  certificate: joi.binary().encoding('base64')
})

const jsonSchema = convert(joiSchema, true)

The output json format is here

Test

npm run test

You can optionally set below environment variables:

CASE_PATTERN=joi-obj-12 to control which version of joi obj to test
DEBUG=true to check which version of the parser is chosen and the joi schema describe output

License

MIT