@cocaxcode/api-testing-mcp

<strong>The most complete MCP server for API testing. Period.</strong>
35 MCP tools &middot; Zero config &middot; Works in any MCP client

Overview · Just Talk to It · Installation · Features · Tool Reference · Storage · Architecture

Quick Overview

The most complete MCP server for API testing — 35 tools, zero config, nothing else comes close. This is not just a request sender. It is a full testing workbench: HTTP requests with assertions, multi-step flows with variable extraction, OpenAPI import with schema-aware mock data, load testing with percentile metrics, response diffing across environments, bulk test runners, reusable collections, project-scoped environments, Postman import/export, and cURL export. All from natural conversation. No accounts, no cloud, no generated files. Everything runs inline and stores as plain JSON you own.

Just Talk to It

You don't need to learn tool names or parameters. Describe what you want and the AI picks the right tool.

"Set up an environment called dev with BASE_URL http://localhost:3000"
"Import my API spec from /api-docs-json"
"Show me all user endpoints"
"GET /users"
"Create a user with random data"
"Verify that DELETE /users/5 returns 204"
"Login as admin, extract the token, then fetch dashboard stats"
"How fast is /health with 50 concurrent requests?"
"Run all my saved smoke tests"
"Compare the users endpoint between dev and prod"
"Export the create-user request as curl"
"Export my collection to Postman"

If you've imported an OpenAPI spec, the AI already knows every endpoint, every required field, every valid enum value. When you say "create a blog post", it reads the schema and builds the request correctly — no guessing.

Installation

Claude Code

claude mcp add --scope user api-testing -- npx -y @cocaxcode/api-testing-mcp@latest

Claude Desktop

Add to your config file (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

{
  "mcpServers": {
    "api-testing": {
      "command": "npx",
      "args": ["-y", "@cocaxcode/api-testing-mcp@latest"]
    }
  }
}

Cursor / Windsurf

Add to .cursor/mcp.json or .windsurf/mcp.json in your project root:

{
  "mcpServers": {
    "api-testing": {
      "command": "npx",
      "args": ["-y", "@cocaxcode/api-testing-mcp@latest"]
    }
  }
}

{
  "servers": {
    "api-testing": {
      "command": "npx",
      "args": ["-y", "@cocaxcode/api-testing-mcp@latest"]
    }
  }
}

codex mcp add api-testing -- npx -y @cocaxcode/api-testing-mcp@latest

[mcp_servers.api-testing]
command = "npx"
args = ["-y", "@cocaxcode/api-testing-mcp@latest"]

{
  "mcpServers": {
    "api-testing": {
      "command": "npx",
      "args": ["-y", "@cocaxcode/api-testing-mcp@latest"]
    }
  }
}

Quick Start

Once installed, set up an environment so relative paths resolve automatically:

"Create an environment called dev with BASE_URL http://localhost:3000"

If your API has a Swagger/OpenAPI spec, import it:

"Import my API spec from http://localhost:3000/api-docs-json"

Verify with: "List my environments" — you should see the one you just created.

Features

HTTP Requests

Send any HTTP method with headers, query params, JSON body, auth, and {{variable}} interpolation. Relative URLs auto-resolve again