ajv.js.org
type: SoftwareApplication
type: SchemaValidator
name: AJV JSON Schema Validator
description: The fastest JSON Schema validator for JavaScript, supporting all major JSON Schema drafts.
code repository: https://github.com/ajv-validator/ajv
programming language: JavaScript

json-schema.hyperjump.io
type: SoftwareApplication
type: SchemaValidator
name: Hyperjump JSON Schema
description: Standards-compliant JSON Schema validation and bundling library supporting all drafts and OpenAPI vocabularies.
code repository: https://github.com/hyperjump-io/json-schema
programming language: JavaScript

spectral
type: SoftwareApplication
type: SchemaValidator
name: Spectral
description: Open-source JSON/YAML linter and schema validator providing customizable rulesets for API governance.
code repository: https://github.com/stoplightio/spectral
programming language: JavaScript