Practical notes for web developers
Short guides about HTTP headers, CORS and JSON in the browser: what breaks, why, and how to fix it without handing your data to anyone.
Written by the developer of the Pure browser extensions. Each guide says so where it mentions our tools.
Guides
ModHeader was removed from Chrome and Edge — how to move your header profiles in 2 minutes What happened, how to check if it is still installed, a five-point safety check for any replacement, and a step-by-step migration.Free tools
JSON formatter and validator Paste JSON, format, minify and check it. Runs in your browser; nothing is uploaded.The Pure extensions
Small browser tools with no account and no tracking. The free versions stay free; Pro is a one-time purchase.
