AI & LLM Tools
API Request Builder
Free online LLM API request builder. Build, format, and test API requests for OpenAI, Claude, Gemini. View JSON payloads and mock responses.
What It Does
Build and test LLM API requests with ease
Privacy
FreeDevTools Studio tools are designed to run in the browser so your content stays on your device whenever possible.
Best For
Quick one-off tasks, lightweight developer workflows, and everyday utility work without installation.
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