# MCP Inspector Online — Browser Alternative to npx @modelcontextprotocol/inspector

> The MCP Inspector, online. Connect to any remote MCP server in the browser, inspect tools, prompts and resources, view raw JSON-RPC frames, and call tools with custom arguments. No npx, no Node, no local setup.

**Source:** https://mcpplaygroundonline.com/mcp-inspector-online

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## The problem this solves

The official inspector is run with `npx @modelcontextprotocol/inspector`. That requires Node on the machine, a terminal, and a local port — which is fine on your laptop and awkward everywhere else: a locked-down work machine, a phone, a code review, a support thread where you want a colleague to reproduce something in one click.

This is the same inspection surface, reachable from a URL.

## What you get

- Connect to any **remote** MCP server over http or SSE
- Browse tools, prompts and resources with their full schemas
- Call any tool with arguments you construct
- Read every raw JSON-RPC request and response
- Share the session context by sharing the URL — no "install Node first" preamble

## What it cannot do

Local **stdio** servers are out of reach from a browser tab: stdio means a child process on your machine, and a web page cannot spawn one. For a stdio server, either run the official inspector locally, or put an http transport in front of it and point this at that.

## Related

- [MCP Server Tester](https://mcpplaygroundonline.com/mcp-server-tester) — the same connection, framed around validating a server you are building.
- [MCP Agent Studio](https://mcpplaygroundonline.com/mcp-agent-studio) — drive the server with a real AI model instead of calling tools by hand.
- [Mock MCP Servers](https://mcpplaygroundonline.com/mock-mcp-servers) — public URLs to point the inspector at right now.

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_Canonical page: https://mcpplaygroundonline.com/mcp-inspector-online_

_MCP Playground (mcpplaygroundonline.com) is a free, browser-based toolkit for the Model Context Protocol: test any remote MCP server, run evals that prove an AI agent can use its tools, build reusable agents across 60+ models, and audit servers for security issues. No install, no local Node, free to start._