工夫 · kufū · the art of making things work

Small, sharp tools for developers.

A hub of developer-focused utilities built to solve small, everyday needs.

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Get a unique URL that captures any incoming HTTP request in real-time. Inspect headers, bodies, and query params as they arrive.

See the public IP address your connection is coming from. Plain-text and JSON endpoints make it scriptable from the command line.

Check my IP

Paste ugly JSON and get it properly formatted.

Format JSON

Learn Git by doing, in a terminal that can't hurt you. Make your first commits, watch the history grow, and dive right in.

Fill the screen with any solid color. A clean backdrop for screenshots, recordings, and color checks.

Open background