MCP REST API Tester

What is MCP REST API Tester?

A TypeScript-based MCP server that enables testing of REST APIs through Claude, Cline and other MCP clients. It allows developers to test and interact with any REST API endpoints directly from their development environment.

How to use MCP REST API Tester?

Install globally via npm install -g dkmaker-mcp-rest-api, then configure the MCP client settings with environment variables for base URL, authentication, SSL verification, and custom headers. Use the test_request tool with parameters method, endpoint, optional body, and optional headers.

Key features of MCP REST API Tester

• Supports GET, POST, PUT, DELETE, and PATCH methods
• Handles Basic, Bearer, and API Key authentication
• Normalizes endpoints automatically
• Provides detailed response information (status, headers, body)
• Configurable SSL verification and response size limit
• Custom global headers via HEADER_* environment variables

Use cases of MCP REST API Tester

• Testing specific API endpoints during development
• Debugging API responses and verifying functionality
• Checking response times and validating request/response formats
• Testing local development servers and API sequences
• Verifying error handling and authentication flows

FAQ from MCP REST API Tester

What authentication methods are supported?

Basic Authentication (username/password), Bearer Token, and API Key (custom header). Only one method should be configured at a time.

How do I configure custom headers?

Set environment variables with the prefix HEADER_ (case-insensitive) followed by the header name. For example, HEADER_X-API-Version=2.0. Per-request headers override these global headers.

Can I disable SSL verification for self-signed certificates?

Yes, set the environment variable REST_ENABLE_SSL_VERIFY to false to disable SSL verification.

What is the default response size limit?

The default response size limit is 10000 bytes (10 KB). It can be changed via the REST_RESPONSE_SIZE_LIMIT environment variable.

Does this server work with any MCP client?

The README provides configuration examples for Cline but states the server should work with any MCP implementation.