ajv-validator/ajv

Health v2 · maintenance only

Adoption not part of the score

14813 stars · 1041 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Ajv is the fastest JSON Schema validator for JavaScript, compiling declarative schemas into optimized validation functions. It supports JSON Schema drafts 04 through 2020-12 and JSON Type Definition (RFC 8927), running in Node.js, browsers, and other JS environments.

Use cases

• validate JSON payloads against a schema in an API
• validate configuration files with JSON Schema
• validate user input in a browser form
• check JSON data structure in Node.js scripts
• validate data using JSON Type Definition RFC8927
• validate ESLint-style plugin configuration schemas
• generate fast reusable validators from schemas

When to choose

• you need high-performance, standards-compliant JSON Schema validation in JavaScript
• you want declarative data validation without writing manual checks
• you need support for multiple JSON Schema drafts or JTD
• you validate schemas in Node.js, browser, or Electron apps

When to avoid

• you need validation in a non-JavaScript language
• you only need simple ad-hoc checks that don't warrant a schema library
• you require draft-04 support without adding the separate ajv-draft-04 package

Facets

library · maturity stable

serialization developer-tools developer-tools web-development apis backend frontend browser cross-platform -schema -validation schema-validator -type-definition rfc8927 data-validation nodejs electron typescript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="ajv-validator/ajv")