Useful immediately
Every card focuses on a real code, data or browser task instead of a generic demo.
JAVASCRIPT IN YOUR BROWSER
Run it. Inspect it. Ship it smaller.
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.
18 focused toolsImport and exportBrowser-first privacy
AVAILABLE JAVASCRIPT UTILITIES
Choose a JavaScript tool
01New
Build & exportClaude JS → PPTX
Clean AI-generated PptxGenJS scripts, find errors by line, apply supported colour fixes and download PowerPoint.
Open JavaScript tool →02New
Build & exportJavaScript Viewer
Paste or import JavaScript, read it with syntax highlighting, edit the source and download a .js file. View code without running it or uploading it.
Open JavaScript tool →03Popular
Run JavaScriptJavaScript Playground
Run JavaScript in an isolated browser sandbox and capture console output without installing Node.js.
Open JavaScript tool →04Popular
Check & optimizeJS Syntax Checker
Find JavaScript syntax errors and receive a focused message before running the code.
Open JavaScript tool →05Recommended
Check & optimizeJS Formatter
Format untidy JavaScript into readable, consistently indented source and download the result.
Open JavaScript tool →06Popular
Check & optimizeJS Minifier
Remove comments and redundant spacing with token-aware minification, preserve significant line boundaries and compare original versus output UTF-8 bytes.
Open JavaScript tool →07New
Data & textJSON ↔ JS Object
Convert valid JSON into a JavaScript assignment, or unwrap a simple assignment containing JSON-compatible data. Source is parsed as JSON, never executed.
Open JavaScript tool →08Popular
Data & textJS Regex Tester
Test JavaScript regular expressions, flags, matches, groups and positions against sample text.
Open JavaScript tool →09Useful
Browser utilitiesJWT Decoder
Decode the readable header and payload of a JSON Web Token locally without claiming to verify its signature.
Open JavaScript tool →10Useful
Browser utilitiesTimestamp Converter
Convert seconds, milliseconds and readable dates between local time, UTC and ISO 8601.
Open JavaScript tool →11New
Browser utilitiesURL Parser
Inspect a URL protocol, origin, host, path, query parameters and fragment without visiting the destination.
Open JavaScript tool →12Fast
Browser utilitiesUUID Generator
Generate one or many cryptographically random UUID v4 identifiers in the browser.
Open JavaScript tool →13Private
Browser utilitiesJS Hash Generator
Generate SHA-256, SHA-384 or SHA-512 checksums for text using the browser cryptography API.
Open JavaScript tool →14Popular
Data & textJS Base64 Tool
Encode Unicode text to Base64 or decode Base64 back into readable UTF-8 text.
Open JavaScript tool →15New
Data & textString Utilities
Count, clean, quote and convert text to camelCase, PascalCase, snake_case, kebab-case or a JS string literal.
Open JavaScript tool →16New
Data & textArray Utilities
Parse an array, remove duplicates, sort, reverse, shuffle, chunk and calculate numeric summaries.
Open JavaScript tool →17Developer
Build & exportpackage.json Validator
Validate package.json structure, inspect scripts and dependencies, sort keys and export a clean file.
Open JavaScript tool →18Advanced
Build & exportJavaScript → PPTX
Turn a PptxGenJS-compatible JavaScript presentation script into a downloadable PowerPoint file.
Open JavaScript tool →Private by default
Ordinary source and text transformations stay in the current browser.
Beginner-readable
Clear controls, samples and explanations help learners understand each result.