How to Test Any MCP Server Online — No Setup Required

TL;DR Go to MCP Playground → Test MCP Server — free, no sign-up Paste your server URL, add a Bearer token if required, click Connect Browse tools, prompts, and resources; execute tools with custom arguments Use the JSON-RPC log to debug protocol-level issues Works with HTTP + SSE and Streamable HTTP transports; not STDIO servers If you've been building with MCP, you know the iteration loop can be slow. Write server code → restart the server → open Claude Desktop → restart Claude Desktop → ask a question → see if the tool got called → repeat. When something goes wrong, it's not obvious where the failure happened. MCP Playground breaks this loop. It's a browser-based MCP client that connects directly to any remote server, shows you everything the server exposes, lets you call tools with custom arguments, and displays the raw JSON-RPC traffic — all without touching your local config. What You Can Test 🔧 Tools Call any tool with custom arguments and see the raw response. Great for validati