Developer Tools
Five free tools are live so far: a JSON formatter, a regex tester, a Base64 encoder and decoder, a JWT decoder, and a UUID generator. Everything runs locally in your browser, nothing you paste is sent to a server. More utilities are added regularly.
JSON Formatter
Format or minify JSON instantly, in your browser.
Regex Tester
Test patterns against your text with live highlighted matches.
Base64 Encoder / Decoder
Convert text to Base64 or decode it back, instantly.
JWT Decoder
Decode a JSON Web Token and see its header and payload instantly.
UUID / GUID Generator
Generate random, version 4 UUIDs, one or a hundred at a time.
New to these tools? Start with the guides
Each tool has a plain-language explainer: JSON explained for beginners, regex explained for beginners, Base64 explained for beginners, JWT explained for beginners and UUIDs and GUIDs explained.
Or browse all Dev Explained guides.
Frequently asked questions
Are the developer tools free, and do I need to sign up?
They are free and need no account or sign-up.
Is what I paste into these tools uploaded?
No. Everything runs locally in your browser, so nothing you paste is sent to a server.
Which developer tools are available?
A JSON formatter, a regex tester, a Base64 encoder and decoder, a JWT decoder and a UUID (GUID) generator. More utilities are added over time.
Is there a guide if I do not know what a tool does?
Yes. The Dev Explained articles give a beginner-friendly introduction to JSON, regex, Base64, JWT and UUIDs.