JavaScript Object Praser

@dmitrytavern/object-parser - is a library for object validation that takes the original object and its schema, and then checks all object properties for existence and typing, can call a custom validator and assign a default value.

The library supports typescript and has smart autocomplete for checked objects.

It has no external dependencies and weighs ~7KiB compressed without gzip and ~3KiB with.

A quick example

npm install --save @dmitrytavern/object-parser

import parser from '@dmitrytavern/object-parser'

const schema = parser.schema({
  name: String,
  age: [String, Number],
  role: parser.property({
    type: String,
    required: false,
    default: 'anonymous',
    validator: (value) => {
      if (!['anonymous', 'user', 'admin'].includes(value))
        throw new Error('Role must be "anonymous", "user" or "admin".')

      return true
    },
  }),
})

const target = { name: 'Dmitry', age: 19 }

const result = parser.parse(target, schema)
// => {
//   value: { name: 'Dmitry', age: 19, role: 'anonymous' }
//   errors: []
// }

What's going on here:

1. Imported parser.
2. Created the object schema where:
   • name - is required property which can be only String.
   • age - is required property which can be String or Number.
   • role - is not required property, which can be only an "anonymous", "user" or "admin" string. Value by default: "anonymous".
3. Parsed the target object by the object schema.

The result of parsing is an object, where:

• value - parsed object. By default is a reference on the original object.
• errors - array of errors. Сontains parsing errors.

Installation

ObjectParser is available via npm:

npm install --save @dmitrytavern/object-parser

Browser/CDN:

<script src="https://unpkg.com/@dmitrytavern/object-parser/dist/object-parser.min.js"></script>

Usage

CommonJS:

const parser = require('@dmitrytavern/object-parser')
const { parser } = require('@dmitrytavern/object-parser')
const { parse, schema, property } = require('@dmitrytavern/object-parser')

ES6:

import parser from '@dmitrytavern/object-parser'
import { parser } from '@dmitrytavern/object-parser'
import { parse, schema, property } from '@dmitrytavern/object-parser'

Browser:

<script>
  const parser = window.objectParser
  const { parser } = window.objectParser
  const { parse, schema, property } = window.objectParser
</script>

You can use the style you prefer. For more information, see docs.

Documentation

Powerful documentation can be found at dmitrytavern.github.io/object-parser.

License

MIT - check repo files

Copyright (c) 2022-present, Dmitry Tavern