Developer Tools
Free online developer tools: JSON formatter, Base64 encoder, regex tester, JWT decoder, and more. All tools run in your browser — no data sent to servers.
9 tools available
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JSON Formatter & Validator
Format, validate, and beautify JSON data instantly.
B64
Base64 Encode/Decode
Encode and decode Base64 strings instantly.
%20
URL Encode/Decode
Encode and decode URLs and query strings instantly.
MD
Markdown Preview
Preview Markdown as rendered HTML
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Regex Tester
Test and debug regular expressions
JWT
JWT Decoder
Decode and inspect JWT tokens
CSS
CSS Minifier & Beautifier
Minify or beautify CSS code
ID
UUID Generator
Generate random UUID v4 identifiers
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Cron Expression Parser
Parse cron expressions to readable text