JSONPlaceholder

What it is

A FastMCP server over JSONPlaceholder, the free fake REST API used for testing and prototyping. It implements all three MCP primitives — tools, resources and prompts — against that data.

What you get

• Posts, users, comments, albums, photos and todos retrieved, whole or by ID
• Comments filtered by post, albums by user, photos by album, todos by user
• Posts searched by title or body content
• A post created, simulated the way JSONPlaceholder does it
• Resources at posts://all, posts://{post_id}, users://all and users://{user_id}
• Prompts for analysing a post and for summarising a user profile

Requirements

Python 3.10 or newer and the uv package manager; uv sync, then run server.py. No key — JSONPlaceholder is public and the data is invented.

Setup effort

Build from source

Tools you get

8 tools named in the project's documentation. Four resources (posts://all, posts://{post_id}, users://all, users://{user_id}) and two prompts (analyze_post, user_profile_summary) sit alongside the tools.

Requires

Python 3.10+