hapijs/joi

The most powerful data validation library for JS

21,172

stars

2,168

commits

JavaScript

primary language

Sep 11, 2026

updated

hapi

javascript

schema

validation

README

joi

The most powerful schema description language and data validator for JavaScript.

Installation

npm install joi

Visit the joi.dev Developer Portal for tutorials, documentation, and support

Useful resources

Contributors

(top 30 of 220)

879 commits

605 commits

104 commits

76 commits

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hapijs/joi

The most powerful data validation library for JS

21,172

stars

2,168

commits

JavaScript

primary language

Sep 11, 2026

updated

hapi

javascript

schema

validation

README

joi

The most powerful schema description language and data validator for JavaScript.

Installation

npm install joi

Visit the joi.dev Developer Portal for tutorials, documentation, and support

Useful resources

Similar repos

ianstormtaylor/superstruct

A simple and composable way to validate data in JavaScript (and TypeScript).

7,130

shared topics

Julian/jsonschema

An implementation of the JSON Schema specification for Python

4,978

shared topics

hapijs/hapi

The Simple, Secure Framework Developers Trust

14,791

shared contributors

hapijs/bourne

JSON.parse() drop-in replacement with prototype poisoning protection

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shared contributors

epoberezkin/jv

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14,820

ajv-validator/ajv

The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON…

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epoberezkin/ajv

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standard-schema/standard-schema

A standard interface for TypeScript schema validation libraries

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Contributors

(top 30 of 220)

879 commits

605 commits

104 commits

76 commits

Languages

JavaScript

97.6%

TypeScript

2.4%