Developer Toolkit
Essential dev tools — JSON formatter, Base64 encoder, regex tester, hash generator, UUID generator, cron builder, SQL formatter, and more.
Stop switching between bookmark folders of dev tools. This collection puts everything a developer needs in one place: JSON formatting, Base64 encoding, regex testing, hash generation, UUID creation, cron scheduling, SQL formatting, JWT decoding, and much more. All tools run client-side with zero data leaving your browser.
No sign-up · No data sent to servers · Instant results
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Tools in This Collection
JSON Formatter
Format, validate, and beautify JSON data
Use tool →Base64 Encoder/Decoder
Encode and decode Base64 strings
Use tool →Regex Tester
Test and debug regular expressions in real-time
Use tool →URL Encoder/Decoder
Encode and decode URL strings
Use tool →Cron Expression Builder
Build and explain cron expressions visually
Use tool →JWT Decoder
Decode and inspect JSON Web Tokens
Use tool →HTML Entity Encoder/Decoder
Encode and decode HTML entities
Use tool →SQL Formatter
Format and beautify SQL queries
Use tool →Color Converter
Convert colors between HEX, RGB, HSL, and more
Use tool →YAML/JSON Converter
Convert between YAML and JSON formats
Use tool →CSS Unit Converter
Convert between px, rem, em, pt, and other CSS units
Use tool →Password Generator
Generate strong, secure passwords
Use tool →Hash Generator
Generate MD5, SHA-1, SHA-256, and other hashes
Use tool →UUID Generator
Generate unique UUIDs and GUIDs
Use tool →Markdown to HTML Converter
Convert Markdown to clean HTML code
Use tool →JSON to CSV Converter
Convert between JSON and CSV formats
Use tool →Hex Color Picker
Pick colors with HEX, RGB, HSL output and WCAG contrast checker
Use tool →README Generator
Generate professional GitHub README.md files with live preview
Use tool →Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation
Use tool →Git Command Generator
Find the right git command for any scenario with copy-paste examples
Use tool →Frequently Asked Questions
Is my code safe in these tools?▾
Yes. All developer tools process data entirely in your browser using client-side JavaScript. Your code, tokens, API keys, and data never leave your device. There is zero server-side processing.
Can I format and validate JSON?▾
Yes. The JSON formatter validates syntax with detailed error messages, beautifies with proper indentation, and supports minification. It handles large files with no server limits.
What hash algorithms are supported?▾
The hash generator supports MD5, SHA-1, SHA-256, and SHA-512. Use SHA-256 for most security purposes. MD5 and SHA-1 are fine for checksums but weak for cryptographic use.
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