Validd

A lightweight, zero-dependency data validation library for JavaScript and TypeScript.

• ⚡ Zero dependencies: 0 runtime dependencies, 0 build dependencies.
• 📦 Dual package: Native ES Modules (import) and CommonJS (require) support.
• 🔷 TypeScript ready: Built-in type definitions (.d.ts) included out of the box.
• 🚀 Asynchronous & Synchronous: Built-in support for sync and async validation rules.

Installation

# Using npm
npm install validd

# Using pnpm
pnpm add validd

# Using yarn
yarn add validd

Usage

ES Modules (ESM)

import { validate } from 'validd'

CommonJS (CJS)

const { validate } = require('validd')

Defining a Schema

Create a schema defining the validation rules for your data:

import { validate } from 'validd'

const customAsyncValidationFunction = (value) =>
  new Promise((resolve) => {
    const error = value === 'admin' ? { error: 'reservedName', message: 'Name is reserved' } : null
    resolve(error)
  })

const formSchema = {
  type: 'object',
  messages: {
    invalidType: 'Tipo de dato inválido',
  },
  fields: {
    personName: {
      type: 'string',
      isRequired: true,
      minLength: 5,
      maxLength: 20,
      regex: /^[a-zA-Z ]+$/,
      validation: customAsyncValidationFunction,
      messages: {
        minLength: 'Must have at least 5 characters',
        maxLength: 'Text is too long...',
      },
    },
  },
}

Validating Data

Pass the schema and the object to validate. validate returns a Promise with the validation result:

const dataToValidate = {
  personName: 'Alice',
}

const result = await validate(formSchema, dataToValidate)
console.log(result)

Example Validation Result

If valid, an empty object or clean fields map is returned:

{}

If errors are encountered:

{
  errors: [
    {
      error: 'invalidType',
      message: 'Invalid data type',
    },
  ],
  fields: {
    personName: {
      errors: [
        {
          error: 'minLength',
          message: 'Must have at least 5 characters',
        },
      ],
    },
  },
}

License

ISC © Oscar Saraza