MCPJam Inspector
UnclaimedTest and develop ChatGPT and MCP apps locally without ngrok or ChatGPT subscription.
TL;DR - MCPJam Inspector
- Locally test and develop ChatGPT and MCP apps.
- Emulates ChatGPT behavior, exposing API calls and JSON-RPC traffic.
- Includes OAuth debugger and LLM playground for testing with various models.
Pricing: Free plan available
Best for: Growing teams
Pricing Plans
Community
Free
- Test server primitives like tools, resources, prompts
- LLM playground for testing in real environments
- Playground free models or bring your own key
- Evals / pen test limited to 1 test case
- OAuth testing with dynamic client registration
- Collaboration features like share tools
- Up to 3 users per team
- Launch Inspector: npx@mcpjam/inspector@latest
Enterprise
Contact us
- Everything in Community, plus:
- Unlimited evals / pen test runs
- Integrate tests into your CI/CD
- Security and evals agent
- Server quality analysis agent
- Unlimited playground use with any model
- Advanced collaboration features
- No seat limits
- Customer success 24/7 support
About MCPJam Inspector
MCPJam Inspector is a local development tool designed for building and testing ChatGPT Apps SDK and MCP (ext-apps) applications. It provides an emulator that simulates ChatGPT's behavior, exposing all `windows.openai` API calls and JSON-RPC traffic, similar to Chrome DevTools for web applications. This allows developers to rapidly iterate on their apps without needing an ngrok tunnel or a ChatGPT subscription.
The tool also includes an OAuth debugger to visualize and verify MCP authorization flows against the MCP specification. Additionally, its LLM playground offers 1:1 emulation with ChatGPT, enabling developers to test their apps against various models, including frontier models like GPT-5, and view them in different display modes. MCPJam aims to streamline the development process for AI applications by providing a comprehensive local testing environment.
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MCPJam Inspector FAQ
MCPJam Inspector offers a free plan with limited features. Paid plans are available for additional functionality.
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MCPJam Inspector is ideal for users looking for developer tools solutions. The free tier is great for getting started, with paid options for teams.