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 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.

MCP REST API Tester MCP Server — Install Guide & Tools

Name: MCP REST API Tester MCP Server
Author: dkmaker

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 your development environment. The mcp rest api tester mcp server wraps that behind the Model Context Protocol, so an assistant can use it through 2 defined tools rather than through you.

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

Adding it to your client

The server ships on npm as dkmaker-mcp-rest-api, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.

Its toolset

Everything the assistant can do here goes through one of these:

Windows — ⚠️ IMPORTANT: Due to a known issue with Windows path resolution (issue #40), you
macOS — Add to ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json: json { "mcpServers": {

Configuration

You will need 8 environment variables: 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. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

Caveats

It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
MCP clients confirm each tool call by default. Leave that on until you have watched what the mcp rest api tester mcp server does with a few real requests.

When to reach for it

Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. MCP REST API Tester's toolset — Windows, macOS — is a fair guide to whether it matches your workflow. It is maintained by dkmaker; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against MCP REST API Tester's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Available tools

Tool	What it does
Windows	⚠️ IMPORTANT: Due to a known issue with Windows path resolution ([issue #40](https://github.com/modelcontextprotocol/servers/issues/40)), you must use the full path instead of %APPDATA%.
macOS	Add to ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json: json { "mcpServers": { "rest-api": { "command": "npx", "args": [ "-y", "dkmaker-mcp-rest-api" ], "env"

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

MCP REST API Tester MCP Server

What is the MCP REST API Tester MCP server?

What it actually does

Adding it to your client

Its toolset

Configuration

Caveats

When to reach for it

Available tools

How to install the MCP REST API Tester MCP server

Configuration

Example prompts to try

Frequently asked questions

Alternatives to the MCP REST API Tester MCP server

Context7

Playwright

GitHub

Linear

Git

Time