Review a small utility
const activeCustomers=customers.filter((customer)=>customer.active);
Inspect the processed JavaScript before replacing the source.
Format JavaScript with the Prettier parser. Use it to inspect or prepare a focused JavaScript snippet. Source processing runs in this browser.
Format HTML, CSS, or JavaScript source. Source, result, and editor preferences are saved locally.
HTML preview runs without script permissions. Formatting follows the bundled parsers. CSS construction tools are in CSS Construction. Download the active source or result as text.
const activeCustomers=customers.filter((customer)=>customer.active);
Inspect the processed JavaScript before replacing the source.
Source processing runs in this browser. Source, result, and editor preferences are saved locally.
HTML, CSS, JavaScript. HTML preview runs without script permissions. Formatting follows the bundled parsers. CSS construction tools are in CSS Construction.
Download the active source or result as text.
Preview uses a restricted iframe. Treat downloaded code as untrusted until reviewed.
Format JSON with consistent indentation and syntax feedback.
JSON tools
Minify JavaScript locally with Terser.
JavaScript tools
Test regular expressions with live match details.
JavaScript tools
Start with a realistic JAVASCRIPT sample
Load a safe example, or paste and upload your source from the toolbar.