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 credentials does it need?

It reads `REST_BASE_URL`, `AUTH_BASIC_USERNAME`, `AUTH_BASIC_PASSWORD`, `AUTH_BEARER`, `AUTH_APIKEY_HEADER_NAME`, `AUTH_APIKEY_VALUE`, `REST_ENABLE_SSL_VERIFY`, `REST_RESPONSE_SIZE_LIMIT` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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MCP REST API Tester MCP Server

A TypeScript-based MCP server that enables testing of REST APIs through Cline. This tool allows you to test and interact with any REST API endpoints

Local serverstdioTypeScript

What is the MCP REST API Tester MCP Server?

A TypeScript-based MCP server that enables testing of REST APIs through Cline. This tool allows you to test and interact with any REST API endpoints directly from

What it actually does

Supports GET, POST, PUT, DELETE, PATCH methods
Handles authentication (Basic, Bearer, API Key)
Normalizes endpoints automatically
Provides detailed response information
Configurable SSL verification and response limits

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

How to install the MCP REST API Tester MCP Server

{
  "mcpServers": {
    "rest-api": {
      "command": "npx",
      "args": ["-y", "dkmaker-mcp-rest-api"],
      "env": {
        "REST_BASE_URL": "your-value",
        "AUTH_BASIC_USERNAME": "your-value",
        "AUTH_BASIC_PASSWORD": "your-value",
        "AUTH_BEARER": "your-value",
        "AUTH_APIKEY_HEADER_NAME": "your-value",
        "AUTH_APIKEY_VALUE": "your-value",
        "REST_ENABLE_SSL_VERIFY": "your-value",
        "REST_RESPONSE_SIZE_LIMIT": "your-value"
      }
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

Variable	Description	Required
REST_BASE_URL	Endpoint or connection string the server talks to.	Yes
AUTH_BASIC_USERNAME	Configuration value read at startup.	Optional
AUTH_BASIC_PASSWORD	Configuration value read at startup.	Optional
AUTH_BEARER	Configuration value read at startup.	Optional
AUTH_APIKEY_HEADER_NAME	Credential the server authenticates with.	Yes
AUTH_APIKEY_VALUE	Credential the server authenticates with.	Yes
REST_ENABLE_SSL_VERIFY	Configuration value read at startup.	Optional
REST_RESPONSE_SIZE_LIMIT	Configuration value read at startup.	Optional

Example prompts to try

“Use MCP REST API Tester to Windows.”
“Use MCP REST API Tester to macOS.”

Frequently asked questions

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

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