mcp-http-inspect

5 HTTP / REST debugging tools for Claude. Stop pasting curl output. Free, MIT.

Devs constantly paste curl output into Claude. mcp-http-inspect lets Claude/Cursor actually make and inspect HTTP requests — with safety defaults (read-only by default; mutations require explicit allowlist).

Install

{
  "mcpServers": {
    "http": {
      "command": "npx",
      "args": ["-y", "@dpm-tools/mcp-http-inspect"]
    }
  }
}

Requires Node.js 22.18+.

Tools (5)

• request — Send HTTP requests. GET/HEAD/OPTIONS work by default; POST/PUT/PATCH/DELETE require allow_mutations: true (safety).
• compare_responses — Hit two URLs, return structured diff (status, headers, body length, header differences).
• inspect_cors — Run preflight + actual request, report all Access-Control-* headers, decide whether a browser would allow it.
• decode_jwt_from_header — Pull JWT from Authorization: Bearer ..., decode header + payload, optionally verify HMAC, flag expiry.
• explain_status — Get the meaning, RFC link, and common causes for any HTTP status code.

Example prompts

• "GET https://api.github.com/repos/torvalds/linux and show me the rate-limit headers."
• "Compare the response from https://example.com/v1/users and https://example.com/v2/users."
• "Inspect CORS for https://api.openai.com/v1/models from origin https://localhost:3000."
• "Decode this Authorization header: Bearer eyJhbGciOiJIUzI1NiJ9..."
• "What does HTTP 429 mean and what should I do about it?"

See examples/prompts.md for more.

Why this exists

Existing HTTP MCPs are either generic fetch wrappers or paid SaaS API testers. Devs need three specific things repeatedly: inspect a response, compare two endpoints, debug CORS. This server is the focused trio plus JWT + status helpers.

Safety design: mutations (POST/PUT/PATCH/DELETE) are gated behind allow_mutations: true to prevent the LLM from accidentally creating/destroying resources. 5MB response body cap. 30s timeout default.

Sister servers from dpm

• mcp-devkit, mcp-public-data, mcp-diff, mcp-archive, mcp-citations, mcp-ical, mcp-dict.

License

MIT © dpm (digital product mill)