is-my-json-valid

A JSONSchema validator that uses code generation to be extremely fast

npm install is-my-json-valid

It supports passes the entire JSONSchema v4 test suite except for remoteRefs and maxLength/minLength when using unicode surrogate pairs.

Usage

Simply pass a schema to compile it

var validator = require('is-my-json-valid')

var validate = validator({
  required: true,
  type: 'object',
  properties: {
    hello: {
      required: true,
      type: 'string'
    }
  }
})

console.log('should be valid', validate({hello: 'world'}))
console.log('should not be valid', validate({}))

// get the last list of errors by checking validate.errors
// the following will print [{field: 'data.hello', message: 'is required'}]
console.log(validate.errors)

You can also pass the schema as a string

var validate = validate('{"type": ... }')

Optionally you can use the require submodule to load a schema from __dirname

var validator = require('is-my-json-valid/require')
var validate = validator('my-schema.json')

Custom formats

is-my-json-valid supports the formats specified in JSON schema v4 (such as date-time). If you want to add your own custom formats pass them as the formats options to the validator

var validate = validator({
  type: 'string',
  required: true,
  format: 'only-a'
}, {
  formats: {
    'only-a': /^a+$/
  }
})

console.log(validate('aa')) // true
console.log(validate('ab')) // false

Performance

This is module is fast

When running the cosmicrealms.com benchmark it yields the following results on my macbook air

is-my-json-valid v4 total time (632) and per document time: 0.00316
amanda v3 total time (27121) and per document time: 1.35605
jayschema v4 total time (99449) and per document time: 4.97245
joi v3 total time (11949) and per document time: 0.59745
json-gate v3 total time (1443) and per document time: 0.07215
json-schema v3 total time (1318) and per document time: 0.0659
JSV v3 total time (33495) and per document time: 1.67475
schema v2 total time (1309) and per document time: 0.06545
tv4 v4 total time (703) and per document time: 0.03515
z-schema v4 total time (3188) and per document time: 0.1594

As seen above is-my-json-valid is 2500x faster than the slowest and ~20x faster than the second fastest

License

MIT