About ClaudKit

ClaudKit is a free API playground for building and testing requests to Anthropic's Claude API. It provides a visual form interface for constructing API calls and generates the equivalent code in curl, Python, and JavaScript with syntax highlighting. You can also test requests directly from your browser by providing your own API key.

Built by Michael Lip

Solo developer with 10+ years experience. 140+ PRs merged into open source projects including Google Chrome and Axios. $400K+ earned on Upwork with 100% Job Success. Creator of 20+ Chrome extensions.

ClaudKit is part of the Zovo Tools network — a collection of free, privacy-first developer tools built to solve real problems without tracking, accounts, or paywalls.

About This Project

ClaudKit is an independent developer tool for building and testing Claude API requests. Everything runs locally in your browser — your API keys never leave your machine.

For Developers

The source code is on GitHub. The syntax highlighting is implemented with simple regex-based span coloring — no external libraries. The entire tool is a single HTML page with one CSS file and one JavaScript file, totaling under 30KB. It loads in under a second on any connection. Contributions and suggestions are welcome.

Helpful references: Anthropic API documentation · MDN Web Docs

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