joiql

Make GraphQL schema creation and data validation easy with Joi.

Example

Run this using node example...

const joiql = require('joiql')
const { object, string, number, array, date } = require('joi')
const app = require('express')()
const graphqlHTTP = require('express-graphql')

// Joi Schemas
const Film = object({
  title: string(),
  producers: array().items(string()),
  release_date: date()
})

const Person = object({
  name: string(),
  films: array().items(Film)
}).meta({
  args: { id: number().required() },
  resolve: (root, args, req, ast) => ({ name: 'Spike Jonze' })
})

// Convert Joi schemas to GraphQL
const schema = joiql({
  query: {
    person: Person,
    film: Film
  }
})

// Mount schema to express
app.use('/', graphqlHTTP({ schema: schema, graphiql: true }))
app.listen(3000, () => console.log('listening on 3000'))

Breaking it down

First, define some schemas using Joi.

const { object, string, number, array, date } = require('joi')

const Film = object({
  title: string(),
  producers: array().items(string()),
  releaseDate: date()
})

const Person = object({
  name: string(),
  films: array().items(Film)
})

JoiQL uses the meta property to extend GraphQL fields. Use meta.args to define GraphQL arguments (adding automatic input validation), and meta.name to declare the GraphQLObjectType type name (without it JoiQL will automatically add a "Anon" type name).

Person.meta({
  name: 'Person',
  args: { id: number().required() }
})

Then create a JoiQL api object from the Joi schemas and expose a GraphQL.js schema object for mounting into a server like Express.

const { graphql } = require('graphql')
const joiql = require('../')

const api = joiql({
  query: {
    person: Person,
    film: Film
  }
})

graphql(api.schema, ...)

TODO

• Figure out how to do circular dependencies (ideally with Joi lazy)

Contributing

Please fork the project and submit a pull request with tests. Install node modules npm install and run tests with npm test.

License

MIT