Developer Tools

Essential developer utilities. Format JSON, test regex, generate UUIDs, encode Base64, decode JWTs, build cron expressions, and hash strings.

JSON Formatter & Validator

Format, validate & explore JSON with tree view & error highlighting

Regex Tester

Test regex patterns with live highlighting & plain-English explanations

UUID / ULID Generator

Generate UUID v4, v7 & ULID — bulk up to 1,000

Base64 Encoder / Decoder

Encode & decode Base64 — text, files & image preview

JWT Decoder

Decode JWTs — view header, payload & expiry status

Cron Expression Generator

Build cron expressions visually — see next 10 run times

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 & HMAC hashes

Password Generator

Generate secure passwords with custom length & character sets

QR Code Generator

Generate QR codes for URLs, text, Wi-Fi & more — download as PNG/SVG

JSON to CSV Converter

Convert JSON arrays to CSV with auto column detection & download

JSON to YAML Converter

Convert JSON to YAML and back — preserves types & nesting

SQL Formatter

Format & beautify SQL queries with proper indentation & keyword styling

Chmod Calculator

Calculate Unix file permissions — numeric & symbolic chmod notation

JSON to XML Converter

Convert JSON to XML and back — nested objects & arrays supported

CSV to JSON Converter

Convert CSV to JSON arrays with auto delimiter detection

JavaScript Formatter

Format, beautify & minify JavaScript with syntax highlighting

YAML Validator

Validate YAML syntax, find errors & convert to JSON

XML Formatter & Validator

Format, beautify & validate XML with error detection

IP Address Analyzer

Analyze IPv4 addresses with subnet calculator & binary/hex conversion

HTML Minifier

Minify HTML — remove comments, whitespace & optional tags

URL Parser & Decoder

Parse URLs into components — protocol, host, path, query params & hash

Backslash Escape / Unescape

Escape & unescape backslash sequences — \n, \t, \", \uXXXX

JSON Path Finder

Explore JSON interactively — click nodes to find & copy paths

Placeholder Image Generator

Generate placeholder images — custom size, color, text & download as PNG/SVG

Essential Tools for Every Developer

These tools solve the tasks developers encounter daily — formatting JSON from API responses, testing regular expressions before deploying, generating secure passwords for new accounts, and decoding JWT tokens during authentication debugging. Every tool runs entirely in your browser using Web Crypto API for security-sensitive operations like password generation and hash computation.

Most Popular Developer Tools

The JSON Formatter & Validator is the most-used tool — paste minified JSON, get instant formatting with tree view, error highlighting, and auto-fix for common issues like trailing commas and unquoted keys. The Regex Tester provides real-time match highlighting, capture group extraction, code generation for JavaScript/Python/PHP/Go, and a replacement mode for testing string.replace() patterns.

For authentication and security, use the JWT Decoder to inspect token claims and expiry, the Password Generator with entropy estimation, and the Hash Generator for MD5, SHA-256, and SHA-512 with file hashing support.

Data Format & Conversion Tools

Convert between data formats with the JSON to CSV Converter (auto-detects columns, flattens nested objects) and the JSON to YAML Converter (bidirectional, perfect for Kubernetes configs). The Base64 Encoder handles text and file encoding with image preview, while the SQL Formatter beautifies queries with proper keyword casing and indentation.

For DevOps and system administration, the Cron Expression Generator builds schedules visually with timezone support, the UUID Generator creates v4/v7/ULID identifiers with a validator mode, and the Chmod Calculator makes Linux file permissions easy to understand.