Useful immediately
Every card focuses on a real code, data or browser task instead of a generic demo.
JAVASCRIPT IN YOUR BROWSER
A focused toolkit for JavaScript learners and developers: execute code, find syntax mistakes, format or minify source, inspect browser data and export useful results. No account is required.
AVAILABLE JAVASCRIPT UTILITIES
Run JavaScript in an isolated browser sandbox and capture console output without installing Node.js.
Open JavaScript tool →Find JavaScript syntax errors and receive a focused message before running the code.
Open JavaScript tool →Format untidy JavaScript into readable, consistently indented source and download the result.
Open JavaScript tool →Remove safe comments and unnecessary whitespace, then compare original, minified and gzip-estimate sizes.
Open JavaScript tool →Convert valid JSON into a JavaScript object literal or serialize a safe object literal back to JSON.
Open JavaScript tool →Test JavaScript regular expressions, flags, matches, groups and positions against sample text.
Open JavaScript tool →Decode the readable header and payload of a JSON Web Token locally without claiming to verify its signature.
Open JavaScript tool →Convert seconds, milliseconds and readable dates between local time, UTC and ISO 8601.
Open JavaScript tool →Inspect a URL origin, path, query parameters and hash, then safely edit or rebuild it.
Open JavaScript tool →Generate one or many cryptographically random UUID v4 identifiers in the browser.
Open JavaScript tool →Generate SHA-256, SHA-384 or SHA-512 checksums for text using the browser cryptography API.
Open JavaScript tool →Encode Unicode text to Base64 or decode Base64 back into readable UTF-8 text.
Open JavaScript tool →Count, clean, quote and convert text to camelCase, PascalCase, snake_case, kebab-case or a JS string literal.
Open JavaScript tool →Parse an array, remove duplicates, sort, reverse, shuffle, chunk and calculate numeric summaries.
Open JavaScript tool →Validate package.json structure, inspect scripts and dependencies, sort keys and export a clean file.
Open JavaScript tool →Turn a PptxGenJS-compatible JavaScript presentation script into a downloadable PowerPoint file.
Open JavaScript tool →Every card focuses on a real code, data or browser task instead of a generic demo.
Ordinary source and text transformations stay in the current browser.
Clear controls, samples and explanations help learners understand each result.