Online Code Editor.
Pick a language mode, edit with Ace highlighting, and download snippets—no install, no account.
Completions appear as you type; press Ctrl+Space to open the list. Tab expands snippets where available. Find: Ctrl+F (Cmd+F on Mac). Format: toolbar button or Ctrl+Shift+B for supported languages.
Choose editor font size in pixels
Pick a language mode in the sidebar. Each URL loads Ace with the right highlighter—start from the samples below.
JavaScript module
export function pick(obj, keys) {
return Object.fromEntries(keys.map((k) => [k, obj[k]]));
}SQL probe
SELECT id, status
FROM jobs
WHERE status = 'queued'
ORDER BY created_at
LIMIT 20;HTML shell
<!doctype html>
<html lang="en">
<body><main><h1>Preview</h1></main></body>
</html>YAML service
services:
web:
image: nginx:1.27
ports:
- '8080:80'