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MCPJam Inspector logo

MCPJam Inspector Logo

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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.

See full MCPJam Inspector review on Toolradar