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Developer Tools
Small coding helpers that stay in the browser: format or diff JSON, preview HTML, decode a JWT, test a regex, minify CSS or JS. No upload, no account.
JSON, HTML preview, JWT, regex and more.
All 18 developer tools are free — use works without login.18 free developer tools — no login to use.
JSON Formatter
Paste JSON to check if it is valid. Format only when you tap Format. Up to 20,000 lines.
Open →JSON Compare
Two JSON files side by side. Extra keys stay visible.
Open →JSON Validator
Check if JSON parses. Shows the error if it doesn’t.
Open →JSON to CSV
Paste JSON on the left. CSV table appears on the right — copy or download.
Open →CSV to JSON
Paste CSV on the left. Formatted JSON appears on the right — copy or download.
Open →Base64 Encoder
Encode and decode Base64 strings quickly in the browser.
Open →JWT Decoder
Inspect JWT header and payload without sending tokens anywhere.
Open →Regex Tester
Test regular expressions against sample text live.
Open →UUID Generator
Generate unique UUIDs for APIs, tests and databases.
Open →URL Encoder / Decoder
Encode or decode URL query strings safely in the browser.
Open →Hash Generator
Create SHA-256 hashes for checksums and quick checks.
Open →Timestamp Converter
Convert Unix timestamps to dates and back.
Open →Color Picker
Pick colours and copy HEX, RGB and HSL values.
Open →HTML Preview
Write HTML on the left, see the page on the right.
Open →Markdown Preview
Preview Markdown headings, bold, lists and links instantly.
Open →CSS Minifier
Minify CSS to reduce file size for production.
Open →JavaScript Minifier
Compress JavaScript for faster page loads.
Open →Binary Converter
Convert text to binary and binary back to readable text.
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