Developer tools

Developer tools for everyday code work.

Format, encode, generate, convert, and validate without leaving the browser. No sign-up, no uploads — pick a tool and go.

Open JSON Formatter

Formatters

Pretty-print and minify JSON, SQL, and source code.

3 tools

JSON Formatter

Format, validate, and minify JSON with syntax highlighting and error reporting.

SQL Formatter

Pretty-print or minify SQL queries with tunable keyword case, indent, and comma placement. Works across Postgres, MySQL, and SQL Server.

HTML / CSS / JS Formatter

Beautify or minify HTML, CSS, and JavaScript with configurable indentation.

Encoders

Base64, URL, and HTML entity encoding and decoding.

3 tools

Base64 Encoder/Decoder

Encode and decode text or files to and from Base64, including data URLs.

URL Encoder/Decoder

Encode and decode URLs with encodeURIComponent and encodeURI variants.

HTML Entity Encoder

Encode and decode HTML entities — named and numeric.

Testers

Regex matching, diffs, and syntax validation.

4 tools

Diff Checker

Compare two blocks of text side by side with color-coded additions and removals.

Regex Tester

Test regular expressions with live match highlighting, capture groups, and a cheatsheet.

JWT Decoder

Decode JWT tokens to inspect the header, payload, and expiry status.

Syntax Checker

Validate syntax for JSON, YAML, JavaScript, HTML, CSS, and SQL.

Generators

UUIDs, cron expressions, hashes, passwords, and QR codes.

7 tools

UUID Generator

Generate RFC 4122 v4 and v7 UUIDs in bulk with one-click copy.

Cron Expression Builder

Build and parse cron expressions with a visual editor and next-run preview.

Test Card Generator

Generate Luhn-valid test credit card numbers for Visa, Mastercard, Amex, and Discover.

QR Code Generator

Generate QR codes for text, URLs, WiFi credentials, and vCards. Download as PNG.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files.

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences, words, or UTF-8 byte budget.

Password Generator

Generate crypto-secure random passwords or diceware-style passphrases with tunable length and character classes.

Converters

Timestamps, colors, YAML/JSON, and JSON to TypeScript.

5 tools

YAML ↔ JSON Converter

Convert between YAML and JSON formats with syntax highlighting.

Timestamp Converter

Convert between Unix timestamps, ISO 8601, and human-readable dates across timezones.

Color Converter

Convert colors between HEX, RGB, HSL, and OKLCH with alpha support and WCAG contrast checks.

Text Case Converter

Convert identifiers and prose between camelCase, snake_case, kebab-case, Title Case, SCREAMING_SNAKE, and more.

JSON to TypeScript

Convert any JSON sample into TypeScript interfaces or type aliases with inferred optional fields and nested types.