🔧 DevToolbox

20+ free developer tools. No signup. No tracking. Runs entirely in your browser.

JSON Formatter & Validator

Paste JSON to format, validate, and minify.

Base64 Encoder / Decoder

Encode or decode Base64 strings.

URL Encoder / Decoder

UUID Generator

Generate random UUIDs (v4).

Count:

Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes.

JWT Decoder

Decode and inspect JSON Web Tokens. Does not verify signatures.

Regex Tester

Pattern: Flags:

Color Converter

Convert between HEX, RGB, and HSL.

Unix Timestamp Converter

Current Unix Timestamp:
Timestamp → Date:
Date → Timestamp:

Text Diff

Compare two texts and see differences.

Original
Modified

Lorem Ipsum Generator

Paragraphs:

Markdown Preview

Markdown
Preview

HTML Entity Encoder / Decoder

CSV ↔ JSON Converter

QR Code Generator

Cron Expression Parser

Password Generator

Length:

Character & Word Counter

JavaScript Minifier

Basic JS minification (removes comments, extra whitespace).

SQL Formatter

⚡ Premium Developer Resources

Deep-dive cheatsheets & guides — instant PDF download.

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Prompt Engineering Mega Pack

50+ battle-tested prompt patterns & frameworks for ChatGPT, Claude, and more.

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Git Power User Cheatsheet

Advanced git workflows, rebasing strategies, recovery commands & automation tips.

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Docker Compose Cheatsheet

Production-ready compose patterns, networking, volumes & debugging.

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Regex Mastery Cheatsheet

Core syntax, lookaheads/lookbehinds, validation patterns, data extraction recipes for Python/JS/Go.

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Linux CLI Essential Reference

150+ essential commands: file mgmt, text processing, networking, processes, security & shell tricks.

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VS Code Productivity Guide

Keyboard shortcuts, must-have extensions, multi-cursor mastery, debugging configs & Git integration.

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Shell Scripting Cookbook

50+ battle-tested Bash recipes: strict mode, argument parsing, file processing, APIs, parallel execution & debugging.

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API Design Patterns Guide

REST, GraphQL, pagination, auth (JWT/OAuth), rate limiting, versioning & security checklist.

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SQL Query Optimization Guide

EXPLAIN ANALYZE, indexing strategies, N+1 fixes, aggregation optimization for PostgreSQL & MySQL.

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Python One-Liners Reference

100+ concise Python snippets: comprehensions, string magic, file I/O, itertools, CLI tricks & debugging.

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