REST API Tester
Integrates with REST API's via Axios to provide a command-line tool for testing and debugging REST A...
Determine the Authentication Method
- Decide which authentication your target REST API requires:
- Basic Authentication (username and password)
- Bearer Token (single token)
- API Key (header name and value)
- Decide which authentication your target REST API requires:
Obtain the Necessary Credentials:
- For Basic Authentication:
- Sign up or log into your target REST API service.
- Create or locate your API username and password.
- For Bearer Token:
- Log into the admin console or developer portal of your API service.
- Generate or copy your API Bearer Token (sometimes called an access token or personal token).
- For API Key:
- Log into your API provider’s dashboard.
- Go to the “API Keys”, “Access Tokens”, or “Credentials” section.
- Generate a new API Key or use an existing one.
- Note both the header name (e.g.,
X-API-Key) and the key value.
- For Basic Authentication:
Gather Your REST API Base URL
- Identify the base URL for your API (e.g.,
https://api.example.com). - This is usually provided in your API’s documentation.
- Identify the base URL for your API (e.g.,
(Optional) Decide on Custom Headers or SSL Settings
- If your API requires custom headers, note the names and values.
- If using self-signed certificates, decide if SSL verification should be disabled.
Fill in Values in the FastMCP Connection Interface
- Click the "Install Now" button for the server.
- In the FastMCP interface, fill in the following environment variables as needed:
REST_BASE_URL: Paste your API base URL.- For Basic Auth:
AUTH_BASIC_USERNAME: Your usernameAUTH_BASIC_PASSWORD: Your password
- For Bearer Token:
AUTH_BEARER: Your bearer token
- For API Key:
AUTH_APIKEY_HEADER_NAME: API key header name (e.g.,X-API-Key)AUTH_APIKEY_VALUE: API key value
- (Optional)
REST_ENABLE_SSL_VERIFY: Set to "false" if skipping SSL verification. - (Optional) Custom headers, prefixed with
HEADER_(e.g.,HEADER_X-API-Version)
Save and Apply
- Save the configuration.
- Restart the MCP server if prompted or if configuration changes do not appear immediately.
Note: Only configure one authentication method at a time. If you don’t know what your API uses, refer to your REST API’s documentation or support resources for details.
How to Install REST API Tester
Install REST API Tester MCP server with one click through FastMCP. Choose your preferred AI development tool below:
Claude Desktop
Click "Claude Desktop" in Quick Start
Cursor IDE
Click "Cursor IDE" in Quick Start
VS Code
Click "VS Code" in Quick Start
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Configuration for
Environment Variables
Please provide values for the following environment variables:
HTTP Headers
Please provide values for the following HTTP headers:
started!
The MCP server should open in . If it doesn't open automatically, please check that you have the application installed.
Copy and run this command in your terminal:
Make sure Gemini CLI is installed:
Visit Gemini CLI documentation for installation instructions.
Make sure Claude Code is installed:
Visit Claude Code documentation for installation instructions.
Installation Steps:
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