Developer Tools
Runs locally. Your tokens and data never leave your browser.
JWT Decoder
Paste a token, see header + payload + expiry
eyJhbGciOiJIUzI1NiIs...
Cron Expression Builder
Build cron syntax visually, see next 5 run times
0 9 * * 1-5 → weekdays at 9am
Base64 Encode/Decode
Convert text ↔ Base64, detect and decode automatically
SGVsbG8gV29ybGQ= → Hello World
JSON ↔ XML Converter
Convert, format, beautify + generate XSD from XML
{"name":"John"} ↔ <name>John</name>
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
abc → a9993e364706816aba3e25...
URL Encoder/Decoder
Encode/decode URLs with encodeURI or encodeURIComponent
hello world → hello%20world
Regex Tester
Test regex patterns with live highlighting
/\d+/g matches 123, 456...
Color Converter
Convert HEX, RGB, HSL, CMYK colors
#3B82F6 → rgb(59, 130, 246)
Markdown Preview
Live preview, word count, export to HTML
# Heading → <h1>Heading</h1>
Diff Checker
Compare texts, see changes highlighted
Split + unified view modes
JWT structure
header.payload.signature
header: algorithm + token type
payload: claims (sub, exp, iat, custom data)
signature: verification (can't decode without secret)
Cron syntax
┌───────────── minute (0-59) │ ┌─────────── hour (0-23) │ │ ┌───────── day of month (1-31) │ │ │ ┌─────── month (1-12) │ │ │ │ ┌───── day of week (0-6, Sun=0) │ │ │ │ │ * * * * *
0 9 * * 1-5 → 9:00 AM, Mon-Fri
*/15 * * * * → every 15 minutes
0 0 1 * * → midnight, 1st of month
Base64 basics
Base64 encodes binary data as ASCII text. Common uses: data URLs, basic auth headers, embedding images in JSON.
Hello World → SGVsbG8gV29ybGQ=
{"key":"value"} → eyJrZXkiOiJ2YWx1ZSJ9
JSON ↔ XML mapping
{"name":"John"} → <name>John</name>
{"items":[1,2]} → <items><item>1</item><item>2</item></items>
Also generates XSD schemas with auto-detected types: xs:integer, xs:boolean, xs:date
Security note: All decoding/encoding happens in your browser. JWTs often contain sensitive data — we never see them. Check the network tab if you don't believe us.