Claude API Tester by Eric

Send test requests to the Anthropic Claude API from your browser. Prefilled Messages API template, x-api-key header auth, response inspector, request history.

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About this extension

Claude API Tester is a lightweight REST client preconfigured for the Anthropic Messages API.

Features:
- Prefilled Messages API request template with required headers
- x-api-key and anthropic-version header support
- Syntax-highlighted JSON responses
- Request history with search and restore
- Import and export cURL commands
- Test streaming and non-streaming requests

Your API key never leaves your browser - requests go directly from the extension to api.anthropic.com.

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Claude API Tester by Eric

Required permissions:

Required data collection, according to the developer:

Optional data collection, according to the developer: