example.js

const fastJson = require('.')
const stringify = fastJson({
  title: 'Example Schema',
  type: 'object',
  properties: {
    firstName: {
      type: 'string'
    },
    lastName: {
      type: 'string'
    },
    age: {
      description: 'Age in years',
      type: 'integer'
    },
    now: {
      type: 'string'
    },
    birthdate: {
      type: ['string'],
      format: 'date-time'
    },
    reg: {
      type: 'string'
    },
    obj: {
      type: 'object',
      properties: {
        bool: {
          type: 'boolean'
        }
      }
    },
    arr: {
      type: 'array',
      items: {
        type: 'object',
        properties: {
          str: {
            type: 'string'
          }
        }
      }
    }
  },
  required: ['now'],
  patternProperties: {
    '.*foo$': {
      type: 'string'
    },
    test: {
      type: 'number'
    },
    date: {
      type: 'string',
      format: 'date-time'
    }
  },
  additionalProperties: {
    type: 'string'
  }
})

console.log(stringify({
  firstName: 'Matteo',
  lastName: 'Collina',
  age: 32,
  now: new Date(),
  reg: /"([^"]|\\")*"/,
  foo: 'hello',
  numfoo: 42,
  test: 42,
  strtest: '23',
  arr: [{ str: 'stark' }, { str: 'lannister' }],
  obj: { bool: true },
  notmatch: 'valar morghulis',
  notmatchobj: { a: true },
  notmatchnum: 42
}))