blancks/fast-jsonpatch-php: Class designed to handle JSON Patch operations in accordance with the RFC 6902 specification

delkano/f3-jsonapi: A few helpful classes to implement a JsonAPI server using the FatFreeFramework and F3-Cortex

Postman To Swagger

swaggest/php-json-schema: High definition PHP structures with JSON-schema based validation

swaggest/php-code-builder: JSON Schema enabled PHP code building abstraction for PHP

GitHub - justinrainbow/json-schema: PHP implementation of JSON schema. Fork of the http://jsonschemaphpv.sourceforge.net/ project

APIMATIC - Dashboard

APITransform: Convert Postman Collections to OpenAPI Spec [Free]

OpenAPI-GUI v3.0.0

nette/schema: 📐 Validating data structures against a given Schema.

Structuring a complex schema — Understanding JSON Schema 7.0 documentation

Combining schemas | Ajv JSON schema validator

JSON Schema Tool

JSON Schema Validator - Newtonsoft