hijaz/postmancer

Overview

An open-source experimental REST client built as an MCP server using TypeScript. It aims to provide an alternative to Postman and Insomnia by offering API testing capabilities within the Model Context Protocol framework. The project is in early development with limited adoption.

Best for

Best for
Developers experimenting with MCP-based API testing and AI integration

Use cases

• Testing REST APIs via MCP-compatible assistants
• Integrating API workflows with AI agents
• Replacing traditional GUI REST clients with a server-based approach

How to use

Install

npm install -g postmancer

Tools exposed

• http_request
• list_collections
• list_requests
• save_request
• request_from_collection
• set_environment_variable
• get_environment_variables

Tested with

Claude Desktop

Example client config

{\n  "mcpServers": {\n    "postmancer": {\n      "command": "npx",\n      "args": ["-y", "postmancer"],\n      "env": {\n        "LOG_LEVEL": "info"\n      }\n    }\n  }\n}

Notes

An open-source experimental REST client built as an MCP server using TypeScript. It aims to provide an alternative to Postman and Insomnia by offering API testing capabilities within the Model Context Protocol framework. The project is in early development with limited adoption.

28 stars on GitHub. Last updated 2025-08-19. Licensed MIT.

Use cases

• Testing REST APIs via MCP-compatible assistants
• Integrating API workflows with AI agents
• Replacing traditional GUI REST clients with a server-based approach

Pros

• Open source with TypeScript codebase
• Leverages MCP protocol for AI tool integration
• Lightweight server-based alternative to GUI clients

Cons

• Experimental status – not production-ready
• Very small community (28 stars) and limited documentation
• Requires MCP-compatible host to function fully

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.