networknt/json-schema-validator

Health v2 · maintenance only

Adoption not part of the score

1078 stars · 353 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A fast Java library for validating JSON and YAML documents against JSON Schema drafts v4, v6, v7, 2019-09, and 2020-12, built on the Jackson parser. It supports custom dialects, vocabularies, keywords, and OpenAPI 3 request/response validation, and powers request validation in the light-4j microservices framework.

Use cases

• validate json payloads against a json schema in java
• validate openapi 3 request and response bodies at runtime
• check yaml config files against a schema
• support multiple json schema draft versions in one app
• high-performance schema validation for microservices
• customize json schema dialects and keywords

When to choose

• you need a fast, actively maintained JSON Schema validator on the JVM
• you must support multiple schema drafts including 2020-12
• you validate OpenAPI 3 requests/responses in a Java service
• you need custom dialects or vocabularies

When to avoid

• your project is not on the JVM
• you need a CLI or standalone validator rather than an embeddable library
• you need non-JSON formats like XML schema validation

Facets

library · maturity active

serialization parser testing developer-tools apis backend web-development jvm cross-platform json-schema jackson openapi3 yaml validation draft-v4 draft-v7 draft-2020-12

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