UTILYARD
tools / developer

Developer Tools

Utilities for formatting, encoding, converting, and debugging. Everything runs in your browser — no login required.

json
JSON Formatter
Format, validate, and minify JSON data.
b64
Base64 Encoder
Encode and decode Base64 strings.
uuid
UUID Generator
Generate version 4 random UUIDs.
ts
Timestamp Converter
Convert Unix timestamps to dates and back.
url
URL Encoder/Decoder
Encode and decode URL components.
hash
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
rx
Regex Tester
Test regular expressions with live highlighting.
clr
Color Converter
Convert between HEX, RGB, HSL, and HSV.
jwt
JWT Decoder
Decode and inspect JSON Web Tokens in your browser.
html
HTML Entity Encoder
Encode and decode HTML entities and special characters.
md
Markdown Previewer
Write Markdown and see the live rendered HTML preview instantly.
base
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
sql
SQL Formatter
Format and beautify SQL queries with proper indentation.
html+
HTML Beautifier
Beautify or minify HTML markup.
css
CSS Minifier
Minify and compress CSS to reduce file size.
js
JavaScript Minifier
Remove comments and whitespace from JavaScript.
cron
Cron Expression Parser
Translate cron expressions into plain English.
ua
User Agent Parser
Detect browser, OS, and device type from a user agent string.
diff
Diff Checker
Compare two texts and highlight line-by-line changes.

DEVELOPER GUIDES

json
What is JSON?
A complete guide to JSON syntax, data types, and common use cases.
b64
What is Base64?
How Base64 encoding works, why it exists, and when to use it.
rx
Regex Tutorial
Learn regular expressions from scratch with practical examples.
jwt
What is a JWT?
How JSON Web Tokens work, their structure, and how to use them safely.
hash
What is a Hash Function?
How hash functions work, what MD5, SHA-1, and SHA-256 are used for, and why some are no longer safe.
md
Markdown Guide
A complete reference for Markdown syntax — headings, lists, links, code blocks, tables, and more.
url
What is URL Encoding?
Why URLs can only contain certain characters, how percent-encoding works, and when to use encodeURI vs. encodeURIComponent.
ts
What is a Unix Timestamp?
How Unix timestamps work, why developers use them, the year 2038 problem, and how to convert timestamps in JavaScript, Python, and SQL.
cron
What is a Cron Job?
How cron works, how to read and write cron expressions, common scheduling patterns, and special shortcuts.
clr
Color Codes Explained
What HEX, RGB, and HSL color codes mean, how to convert between them, and when to use each format.
ua
What is a User Agent?
What user agent strings are, how browsers identify themselves, why they look messy, and how to read them in code.
bin
Binary, Hex, and Decimal Explained
How number systems work, conversion examples, and where binary and hexadecimal are used in programming.