JSONing API - Free and open-source mock API for testing and prototyping. Easily create a mock API from JSON data, with the ability to define custom rules for HTTP status codes, headers, and response bodies.

Format JSON Online - Easily format, validate, and beautify JSON data with our free online tool. Includes powerful JSON conversion features for seamless data management

JSON Placeholder - JSON Placeholder is a modern platform that provides you online REST API, which you can instantly use whenever you need any fake data.

ReqRes - A hosted REST-API ready to respond to your AJAX requests.

Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.

Mockae - The most flexible way to mock REST APIs with Lua code execution