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Postmancer

A standalone MCP server for API testing and management, allowing AI assistants to interact with RESTful APIs through natural language.

Overview

Postmancer is an MCP (Model Context Protocol) server that enables AI assistants like Claude to make HTTP requests, manage collections of API endpoints, and test API responses. It provides similar functionality to tools like Postman or Insomnia but designed specifically for AI assistants.

Features

Make HTTP requests to any REST API
Save and organize requests in collections
Set and use environment variables with variable substitution
Multiple authentication methods (Basic, Bearer, API Key, OAuth2)
Request/response history and testing

Quick Start

Installation

# Install globally
npm install -g postmancer

# Or run directly with npx
npx postmancer

Using with Claude Desktop

Add this to your Claude Desktop configuration file:

Windows: %USERPROFILE%\.claude\claude_desktop_config.json
macOS/Linux: ~/.claude/claude_desktop_config.json

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

Using with Docker

docker run -i --rm \
  --mount type=bind,src=/path/to/collections,dst=/data/collections \
  postmancer

Available Tools

Postmancer provides the following tools to AI assistants:

http_request - Send HTTP requests to any URL
list_collections - View all your saved API collections
list_requests - View all requests in a collection
save_request - Save a request to a collection
request_from_collection - Execute a saved request
set_environment_variable - Set variables for request templates
get_environment_variables - View all environment variables

Configuration

Configure Postmancer with these environment variables:

COLLECTIONS_PATH: Path to store collections (default: ~/.postmancer)
LOG_LEVEL: Logging level (debug, info, warn, error) (default: info)
POSTMANCER_ENCRYPTION_KEY: Secret key used to encrypt credentials and tokens (gene

Categories

Current Category: insomnia

postmancer