Developer tools

Format, minify and generate code, validate structured data, look up DNS and HTTP headers, and design CSS layouts — 32 hands-on tools that run entirely in your browser.

Note: Every formatter, generator and validator works locally on your device — your code is never uploaded. Only the DNS Record Lookup and HTTP Header Checker make network requests, and they call free public lookup APIs with the address you type.

Formatters & minifiers

JSON → TypeScript

Interfaces and type aliases from a sample.

SQL Formatter

Clause-per-line layout, keyword casing.

SQL Minifier

Strip comments and collapse whitespace.

HTML Formatter

Indent nested markup, protect raw text.

HTML Minifier

Comment-free, whitespace-collapsed HTML.

CSS Formatter

Expand minified stylesheets.

CSS Minifier

Smallest valid stylesheet.

JavaScript Formatter

Token-aware beautifier, K&R or Allman.

JavaScript Minifier

Comment-free, ASI-safe compression.

Validators & query tools

JSONPath Tester

Wildcards, slices, filters, recursion.

JSON Schema Validator

Every error with its instance path.

YAML Validator

Line-accurate syntax errors.

URLs, slugs & meta tags

URL Query Parser

Decode parameters and repeats.

URL Query Builder

Build correctly encoded URLs.

URL Slug Generator

Accent-safe, SEO-friendly slugs.

Open Graph Generator

Social tags with a live preview.

CSS generators & playground

CSS Gradient Generator

Linear, radial and conic, live.

Box Shadow Generator

Offset, blur, spread, opacity.

Flexbox Generator

Direction, wrap, alignment, gap.

CSS Grid Generator

Tracks, gaps and item alignment.

HTML Playground

Live HTML, CSS and JS sandbox.

Lookups & network tools

HTTP Status Code Lookup

Every code, with when to use it.

MIME Type Lookup

Extension to media type and back.

User-Agent Parser

Browser, OS, device and engine.

DNS Record Lookup

A, MX, TXT, NS, CNAME and more.

HTTP Header Checker

Real status line and response headers.

IP Subnet Calculator

Network, broadcast and host range.

Cron Expression Generator

Build, explain and schedule.

Project & security helpers

.gitignore Generator

Presets for languages, editors, OS.

Chmod Calculator

Octal, symbolic and ls -l modes.

CSP Header Generator

Content-Security-Policy builder.

Bcrypt Hash Verifier

Verify or create bcrypt hashes.