Online MCP Inspector: Web-Based Tool for Testing & Debugging

What is Online MCP Inspector?

Online MCP Inspector is a web-based tool for testing and debugging MCP (Model Context Protocol) servers directly in the browser. It requires no installation or command line, simplifying MCP development for builders and integrators.

How to use Online MCP Inspector?

Open the tool in your browser, select a transport type, enter your MCP server’s SSE URL, optionally configure authentication, and click the Connect button to begin testing and debugging.

Key features of Online MCP Inspector

• Runs entirely in the browser; no installation required.
• Supports SSE transport type for MCP server connections.
• Built-in authentication configuration panel.
• Connection status indicator (disconnected/connected).
• Theme selector (light/dark) for visual preference.
• Direct links to official MCP documentation and debugging guides.

Use cases of Online MCP Inspector

• Quickly test a local MCP server during development.
• Debug server responses without leaving the browser.
• Validate authentication settings before integrating with a client.

FAQ from Online MCP Inspector

What does Online MCP Inspector do?

It lets you test and debug MCP (Model Context Protocol) servers directly in a web browser, with no command line or local setup needed.

Does it require any installation?

No. It is a fully web-based tool – you just open the page and use it.

What transport protocol does it support?

The visible interface supports SSE (Server-Sent Events) transport, as indicated by the URL field defaulting to http://localhost:3001/sse.

Is Online MCP Inspector free?

The README does not mention pricing or licensing. The tool is publicly accessible online and appears to be free to use, but no explicit statement is provided.

Can I configure authentication for my MCP server?

Yes, the inspector includes an authentication panel that you can expand to supply necessary credentials before connecting.