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MCP Jest

v1.0.0•Developer Tools•stable

Automated testing for Model Context Protocol servers. Ship MCP Servers with confidence.

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What is MCP Jest?

MCP Jest is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to automated testing for model context protocol servers. ship mcp servers with confidence.

Automated testing for Model Context Protocol servers. Ship MCP Servers with confidence.

This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.

Features

  • Automated testing for Model Context Protocol servers. Ship M

Use Cases

MCP server automated testing
Jest integration for CI/CD
ReallyArtificial

Maintainer

LicenseMIT
Languagetypescript
Versionv1.0.0
UpdatedMay 21, 2026
Statushealthy
Maintenanceactive

Works with

ClaudeOpenAIwindowsmacoslinux
View SourceBrowse All Servers

Installation

Manual Installation

npx mcp-jest

Configuration

Configuration Details

Config File

claude_desktop_config.json

Performance

Response Metrics

Response Time< 200ms
ThroughputMedium

Resource Usage

Memory UsageLow
CPU UsageLow

How to Set Up and Use MCP Jest

mcp-jest is an automated testing framework for Model Context Protocol servers that brings Jest-style testing patterns to MCP development, letting you verify that your server's tools, resources, and prompts behave correctly before shipping. It provides both a CLI for quick command-line test runs and a JavaScript/TypeScript API for integration into existing test suites and CI/CD pipelines. Developers building MCP servers use it to catch regressions, validate protocol compliance, and ensure that tool responses meet expected contracts without manually poking at a running server.

Prerequisites

  • Node.js 16 or later
  • npm or yarn for package installation
  • An existing MCP server to test (any language, started via a command)
  • Optional: a CI/CD environment such as GitHub Actions for automated test runs
1

Install mcp-jest

Install mcp-jest as a project dev dependency or globally for CLI use.

# As a project dev dependency:
npm install --save-dev mcp-jest

# Or globally for CLI access:
npm install -g mcp-jest
2

Run a quick CLI test

Use the CLI to start your MCP server and test specific tools in one command. The --tools flag specifies which tools to verify.

mcp-jest node ./server.js --tools search,email
3

Create a JSON test configuration file

For repeatable tests, create a test configuration file that defines your server startup command and the expected behavior of each tool.

{
  "server": {
    "command": "node",
    "args": ["./server.js"]
  },
  "tests": {
    "tools": {
      "search": {
        "args": { "query": "test" },
        "expect": "content.length > 0"
      },
      "email": {
        "args": { "to": "[email protected]", "subject": "Test" },
        "expect": "status === 'sent'"
      }
    }
  }
}
4

Run tests from configuration file

Execute the full test suite defined in your JSON config file.

mcp-jest --config test.json
5

Integrate via the JavaScript API

Import mcpTest in your Jest or Mocha test files to run MCP server tests programmatically as part of your existing test suite.

import { mcpTest } from 'mcp-jest';

const results = await mcpTest(
  { command: 'node', args: ['./server.js'] },
  { tools: ['search', 'email'] }
);
console.log(results);

MCP Jest Examples

Test configuration file

A sample mcp-jest JSON configuration that starts a Node.js MCP server and validates two tools.

{
  "server": {
    "command": "node",
    "args": ["./server.js"]
  },
  "tests": {
    "tools": {
      "search": {
        "args": { "query": "hello world" },
        "expect": "content.length > 0"
      }
    }
  }
}

Prompts to try

CLI usage patterns and integration scenarios for mcp-jest in development workflows.

- Run: mcp-jest node ./server.js --tools search,email
- Run: mcp-jest --config test.json
- Add to package.json scripts: "test:mcp": "mcp-jest --config mcp-test.json"
- Use in CI: npx mcp-jest node ./dist/server.js --tools all

Troubleshooting MCP Jest

mcp-jest exits immediately with 'server did not start' error

Check that the command and args in your config correctly start your MCP server. Test the server startup command manually (e.g. 'node ./server.js') and verify it runs without errors before using mcp-jest.

Tool tests fail even though the tool works manually

The 'expect' expression is evaluated against the tool response object. Log the raw response first by removing the expect field and inspecting the output structure, then write the expect expression to match the actual response shape.

mcp-jest command not found after global install

Ensure the npm global bin directory is in your PATH. Run 'npm bin -g' to find the directory and add it to your shell profile (e.g. export PATH="$(npm bin -g):$PATH" in ~/.zshrc).

Frequently Asked Questions about MCP Jest

What is MCP Jest?

MCP Jest is a Model Context Protocol (MCP) server that automated testing for model context protocol servers. ship mcp servers with confidence. It connects AI assistants to external tools and data sources through a standardized interface.

How do I install MCP Jest?

Follow the installation instructions on the MCP Jest GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.

Which AI clients work with MCP Jest?

MCP Jest works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.

Is MCP Jest free to use?

Yes, MCP Jest is open source and available under the MIT license. You can use it freely in both personal and commercial projects.

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Quick Config Preview

{ "mcpServers": { "mcp-jest": { "command": "npx", "args": ["-y", "mcp-jest"] } } }

Add this to your claude_desktop_config.json or .cursor/mcp.json

Read the full setup guide →

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