API Tools
Free developer tools for the Claude API. Build requests, create tool schemas, convert formats, and test vision capabilities. Everything runs in your browser.
API Request Builder
Generate curl, Python, and JavaScript code for Claude API calls. Visual form builder with instant code output and pricing estimation.
Tool/Function Builder
JSON Schema generator for Claude tool use. Build tool definitions visually with parameter types, descriptions, and required fields.
Message Format Converter
Translate message formats between OpenAI, Anthropic, and Google APIs. Paste in one format, get the equivalent in another instantly.
Vision API Tester
Upload images and test Claude's vision capabilities. Preview responses and generate production-ready code for image analysis tasks.
Vision API Playground
Drag-and-drop image upload with 8 example types (charts, documents, screenshots, photos). Simulated responses, prompt suggestions, and code generation in Python, Node.js, and curl.