json-server is a development toolset used to simulate a full REST API from a JSON file. It functions as a customizable mock API server that allows for the simulation of CRUD operations and resource relationships without the need to write backend code.
The project enables rapid prototyping by generating a fake backend that persists data changes back to a local JSON file. It distinguishes itself by providing a static asset file server to deliver local documents, images, and stylesheets alongside the mock API endpoints.
The server includes capabilities for data querying, such as parameter-based filtering, pagination, and sorting. It also supports resource relationship management through relational data embedding and offers extensibility via a middleware-based request pipeline for custom logic and authentication.