Tools

Developer tools

JSON, regex, Markdown — utilities for working with code and structured data.

Beautify, minify, and validate JSON in your browser. Live updates, copy with one click — nothing leaves your device.

Build, test and debug JavaScript regular expressions with live highlighting, replace mode and ready-to-use presets.

Write Markdown on the left, see the rendered HTML on the right. Live preview, GFM support, copy as HTML.