Schema Validation

aid: schema-validation
name: Schema Validation
description: >-
  Schema validation is the practice of verifying that data structures conform
  to a defined schema, contract, or specification. In API development, schema
  validation ensures API requests and responses match declared OpenAPI, JSON
  Schema, AsyncAPI, or GraphQL specifications, enabling contract testing,
  governance, and runtime integrity. Key tools include AJV, Hyperjump JSON
  Schema, Spectral, and Schemathesis, each addressing different validation
  contexts from CLI pipelines to runtime API testing.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- API Governance
- Contract Testing
- JSON Schema
- OpenAPI
- Schema Validation
url: >-
  https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/apis.yml
created: '2025'
modified: '2026-05-02'
specificationVersion: '0.19'
apis:
- aid: schema-validation:ajv
  name: AJV JSON Schema Validator
  description: >-
    AJV (Another JSON Validator) is the fastest JSON Schema validator for
    JavaScript and Node.js. It supports JSON Schema drafts 04/06/07/2019-09/
    2020-12 and JSON Type Definition (RFC 8927). AJV compiles schemas to
    highly optimized JavaScript functions for maximum runtime performance.
  humanURL: https://ajv.js.org/
  tags:
  - JSON Schema
  - JavaScript
  - Schema Validation
  - Node.js
  properties:
  - type: Documentation
    url: https://ajv.js.org/
  - type: GitHubRepository
    url: https://github.com/ajv-validator/ajv
  - type: npm Package
    url: https://www.npmjs.com/package/ajv
  - type: APIReference
    url: https://ajv.js.org/api.html
  - url: graphql/schema-validation-graphql.md
    type: GraphQL
- aid: schema-validation:hyperjump-json-schema
  name: Hyperjump JSON Schema
  description: >-
    Hyperjump is a JSON Schema validation, annotation, and bundling library
    for JavaScript. It supports JSON Schema drafts 04, 06, 07, 2019-09,
    2020-12, OpenAPI 3.0, and OpenAPI 3.1 vocabularies. It also provides
    an OAS Schema Validator for OpenAPI-specific validation.
  humanURL: https://json-schema.hyperjump.io/
  tags:
  - JSON Schema
  - JavaScript
  - OpenAPI
  - Schema Validation
  properties:
  - type: Documentation
    url: https://json-schema.hyperjump.io/
  - type: GitHubRepository
    url: https://github.com/hyperjump-io/json-schema
  - type: npm Package
    url: https://www.npmjs.com/package/@hyperjump/json-schema
- aid: schema-validation:spectral
  name: Spectral
  description: >-
    Spectral is an open-source JSON/YAML linter and schema validator from
    Stoplight. It provides customizable rulesets for validating OpenAPI,
    AsyncAPI, JSON Schema, and any custom schema format, enabling API
    governance at the CLI, IDE, and CI/CD pipeline level.
  humanURL: https://stoplight.io/open-source/spectral
  tags:
  - API Governance
  - API Linting
  - JSON Schema
  - OpenAPI
  - Schema Validation
  properties:
  - type: Documentation
    url: https://docs.stoplight.io/docs/spectral/
  - type: GitHubRepository
    url: https://github.com/stoplightio/spectral
  - type: npm Package
    url: https://www.npmjs.com/package/@stoplight/spectral-core
- aid: schema-validation:openapi-schema-validator
  name: OpenAPI Schema Validator
  description: >-
    A Node.js library for validating OpenAPI schemas against the OpenAPI
    specification for versions 2.0 (Swagger), 3.0.x, and 3.1.x. Available
    as both a library and CLI tool.
  humanURL: https://github.com/seriousme/openapi-schema-validator
  tags:
  - OpenAPI
  - Schema Validation
  - Node.js
  properties:
  - type: GitHubRepository
    url: https://github.com/seriousme/openapi-schema-validator
  - type: npm Package
    url: https://www.npmjs.com/package/@seriousme/openapi-schema-validator
- aid: schema-validation:blaze-validator
  name: Blaze JSON Schema Validator
  description: >-
    An ultra high-performance JSON Schema validator for C++ with support for
    JSON Schema Draft 4, Draft 6, Draft 7, 2019-09, and 2020-12. Suitable
    for high-throughput server-side validation scenarios.
  humanURL: https://github.com/sourcemeta/blaze
  tags:
  - C++
  - JSON Schema
  - Performance
  - Schema Validation
  properties:
  - type: GitHubRepository
    url: https://github.com/sourcemeta/blaze
- aid: schema-validation:alterschema
  name: AlterSchema
  description: >-
    A tooling library for upgrading JSON Schema documents from previous
    versions (Draft 4, 6, 7, 2019-09) to the latest draft 2020-12,
    enabling schema modernization pipelines.
  humanURL: https://github.com/sourcemeta/alterschema
  tags:
  - JSON Schema
  - Schema Migration
  - Schema Validation
  properties:
  - type: GitHubRepository
    url: https://github.com/sourcemeta/alterschema
common:
- type: Website
  url: https://json-schema.org/
- type: Documentation
  url: https://json-schema.org/learn
- type: Blog
  url: https://apievangelist.com/archive/
- type: GitHubOrganization
  url: https://github.com/json-schema-org
- type: JSONSchema
  url: >-
    https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/json-schema/schema-validation-config-schema.json
- type: JSONStructure
  url: >-
    https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/json-structure/schema-validation-config-structure.json
- type: JSONLD
  url: >-
    https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/json-ld/schema-validation-context.jsonld
- type: Vocabulary
  url: >-
    https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/vocabulary/schema-validation-vocabulary.yml
- type: Examples
  url: >-
    https://raw.githubusercontent.com/api-evangelist/schema-validation/refs/heads/main/examples/schema-validation-ajv-example.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com