LoopBack JSON Schema Registry

Example Usage

server.js:

import loopback from 'loopback'
import Registry from 'loopback-jsonschema-registry'
import path from 'path'

// Configure the app to not load the built-in models, so that the registry
// can be overridden first, allowing to change the way model.json configs are
// parsed.
const app = loopback({
  localRegistry: true,
  loadBuiltinModels: false
})


// Override app.registry with a JSON Schema Registry
app.registry = new Registry({
  // Load and register all validators (keywords or formats) from ./validators
  loadValidators: path.resolve(__dirname, 'validators'),

  // Disable and emulate default LoopBack validations through JSON schema:
  emulateValidations: true,

  // Define further processing / translation of model JSON properties:
  configureProperty(schema) {
    if (schema.computed) {
      // Don't include computed properties in LB schema.
      return false
    }
    // App-wide rules:
    const {type} = schema
    if (type === 'integer') {
	  // JSON 'integer' is translated to LB 'number'
      schema.type = 'number'
    } else if (type === 'number' && !schema.postgresql) {
	  // JSON 'number' is used for double precision fields by adding postgresql
	  // specific information
      schema.postgresql = {
        dataType: 'double precision'
      }
    }
  }
})

validators/range.js:

export default {
  keyword: 'range',
  type: ['number', 'integer'],
  metaSchema: {
    type: 'array',
    items: [
      { type: 'number' },
      { type: 'number' }
    ],
    additionalItems: false
  },
  macro(config) {
    return {
      minimum: config[0],
      maximum: config[1]
    }
  }
}

models/test.json:

{
  "name": "Test",
  "base": "PersistedModel",
  "properties": {
    "factor": {
      "type": "integer",
      "range": [0, 50],
      "required": true
    }
  }
}

DEBUG=loopback:contrib:jsonschema-registry yarn start

loopback:contrib:jsonschema-registry LoopBack Schema for Model `Test`:

{
  "name": "Test",
  "base": "PersistedModel",
  "properties": {
    "factor": {
      "type": "number",
      "required": true
    }
  }
}

loopback:contrib:jsonschema-registry JSON Schema for Model `Test`:

{
  "id": "Test",
  "$schema": "http://json-schema.org/draft-06/schema#",
  "$async": true,
  "type": "object",
  "properties": {
    "factor": {
      "type": "integer",
      "range": [
        0,
        50
      ],
      "format": "required"
    },
    "id": {
      "type": [
        "number",
        "null"
      ]
    }
  },
  "required": [
    "factor"
  ],
  "additionalProperties": false
}