Developer Tools

Utilities for everyday development work: hashing, encoding, color codes, regex testing, validators, generators, and more -- all free and processed entirely in your browser.

Featured Guides

JWT Explained: What's Actually Inside a JSON Web Token

How JWTs actually work under the hood.

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Cron Syntax Cheatsheet: How to Read Any Crontab Schedule

The five fields, decoded.

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Cloud GPU Pricing Explained: Community Cloud vs. Hyperscalers

Why the same GPU can cost 3.5x more depending on where you rent it.

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How Much Do LLM API Calls Actually Cost? A Practical Guide

Input vs. output token pricing, explained.

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JSON Formatter

Format and validate JSON data.

Regex Tester

Test and debug regex patterns.

JWT Decoder

Decode JSON Web Tokens securely.

CSS Minifier

Compress CSS code instantly.

JS Minifier

Compress JavaScript code instantly.

HTML Minifier

Compress HTML payload size.

CSS Grid Generator

Visually generate CSS Grids.

Box Shadow Generator

Create CSS drop shadows.

Gradient Generator

Generate CSS linear gradients.

Gradient Library

Browse curated, ready-to-use CSS gradients.

Flexbox Generator

Generate CSS Flexbox layouts.

QR Code Generator

Create custom QR codes free.

Cron Job Parser

Translate cron to plain English.

SQL Formatter

Beautify messy SQL queries.

JSON Viewer

Explore JSON as a collapsible tree.

JSON Validator

Check JSON syntax and see errors.

XML Formatter

Pretty-print and indent XML.

Sitemap Generator

Build a sitemap.xml from your URLs.

QR Code Scanner

Decode QR codes from image or camera.

HTML Beautifier

Format and pretty-print HTML code.

SQL Beautifier

Format and pretty-print SQL queries.

XML Validator

Validate XML code and check for errors.

XML Viewer

View & format XML with syntax highlighting.

JSON Minifier

Minify JSON by removing whitespace.

CSS Beautifier

Format and pretty-print CSS code.

Robots.txt Generator

Generate a robots.txt file for your website.

URL Encoder

Encode text into a URL-safe string.

YAML Formatter

Format and indent YAML cleanly.

CSV Formatter

Clean up and align CSV data.

Cron Expression Generator

Build cron schedules visually.

YAML Validator

Check YAML syntax for common errors.

Color Contrast Checker

Check WCAG contrast ratios between colors.

Slug Generator

Create URL-friendly slugs from text.

JavaScript Beautifier

Beautify or minify JavaScript code.

Regex Generator

Build regex patterns visually with a live preview.

SQL Minifier

Compress SQL queries to reduce size.

API Key Generator

Create secure random API keys.

Code128 Barcode Generator

Turn text into a scannable Code128 barcode.

CSS Animation Generator

Build CSS keyframe animations visually.

CSS Clip-Path Generator

Create custom shapes with clip-path visually.

CSS Filter Generator

Build CSS filter effects with sliders.

CSS Gradient Text Generator

Create gradient-filled text with CSS.

CSS Text Shadow Generator

Build CSS text-shadow effects visually.

EAN-13 Barcode Generator

Generate scannable EAN-13 retail barcodes.

Hex Color Generator

Generate random hex color palettes.

Leap Year Checker

Check if a year is a leap year.

MD5 Hash Generator

Generate an MD5 hash from any text.

Meta Tag Generator

Generate HTML meta tags for SEO.

Open Graph Generator

Generate Open Graph & Twitter Card tags.

Password Hash Generator

Hash a password with MD5, SHA-1, or SHA-256.

Regex Cheat Sheet

Quick reference for regex syntax & patterns.

RGB Color Generator

Generate random RGB color palettes.

SHA-256 Hash Generator

Generate a SHA-256 hash from any text.

SQL Validator

Basic SQL sanity checker for common issues.

URL Parser

Break a URL into its component parts.

UUID Validator

Validate a UUID and detect its version.

JSON to TypeScript

Generate TypeScript interfaces from JSON.

JSON to Go Struct

Generate Go structs from JSON.

JSON to Go BSON

Generate Go structs with json + bson tags.

JSON to Java

Generate Java POJO classes from JSON.

JSON to Kotlin

Generate Kotlin data classes from JSON.

JSON to Scala Case Class

Generate Scala case classes from JSON.

JSON to Rust Serde

Generate Rust structs from JSON.

JSON to Zod Schema

Generate Zod schemas from JSON.

JSON to io-ts

Generate io-ts codecs from JSON.

JSON to JSON Schema

Generate a JSON Schema from JSON.

JSON to JSDoc

Generate JSDoc @typedef blocks from JSON.

JSON to MobX-State-Tree

Generate MST models from JSON.

JSON to Mongoose Schema

Generate Mongoose schemas from JSON.

JSON to MySQL

Generate MySQL CREATE TABLE statements from JSON.

JSON to React PropTypes

Generate React PropTypes from JSON.

JSON to Sarcastic

Generate Sarcastic schemas from JSON.

JSON to TOML

Convert JSON to a TOML document.

JSON to YAML

Convert JSON to a YAML document.

JSON to GraphQL

Generate a GraphQL schema from JSON.

JSON to BigQuery Schema

Generate a BigQuery table schema from JSON.

JSON Schema to TypeScript

Generate TypeScript interfaces from a JSON Schema document.

JSON Schema to Zod

Generate a Zod schema from a JSON Schema document.

JSON Schema to OpenAPI

Generate an OpenAPI schema fragment from a JSON Schema document.

JSON Schema to Protobuf

Generate a Protocol Buffers message from a JSON Schema document.

JSON to Flow

Generate Flow types from JSON.

SVG to JSX

Convert SVG markup into a React JSX component.

SVG to React Native

Convert SVG markup into a react-native-svg component.

HTML to JSX

Convert raw HTML into valid JSX.

HTML to Pug

Convert HTML markup into Pug template syntax.

CSS to JS Objects

Convert CSS rules into JS style objects.

CSS to Template Literal

Convert CSS rules into styled-components templates.

CSS to Tailwind CSS

Best-effort conversion of CSS into Tailwind classes.

JavaScript to JSON

Convert a permissive JS object literal into strict JSON.

GraphQL to Introspection JSON

Run a real introspection query against your GraphQL SDL.

GraphQL to Schema AST

Parse a GraphQL SDL schema into a clean, readable AST.

GraphQL to TypeScript

Generate TypeScript interfaces from a GraphQL SDL schema.

GraphQL to Flow

Generate Flow types from a GraphQL SDL schema.

GraphQL to JAVA

Generate Java POJO classes from a GraphQL SDL schema.

GraphQL to Resolvers Signature

Generate resolver map stubs from a GraphQL SDL schema.

GraphQL to Fragment Matcher

Generate Apollo's IntrospectionFragmentMatcher JSON.

GraphQL to TypeScript MongoDB

Generate TypeScript interfaces with an approximate _id field.

GraphQL to Components

Scaffold a React component from a GraphQL operation.

JSON-LD to Compacted

Compact a JSON-LD document using its context.

JSON-LD to Expanded

Expand a JSON-LD document into full IRIs.

JSON-LD to Flattened

Flatten a JSON-LD document into one node array.

JSON-LD to Framed

Reshape a JSON-LD document with a frame.

JSON-LD to N-Quads

Convert JSON-LD to N-Quads RDF.

JSON-LD to Normalized

Canonicalize JSON-LD with URDNA2015.

TypeScript to Flow

Convert TypeScript interfaces to Flow types.

TypeScript to JSON Schema

Convert TypeScript interfaces to JSON Schema.

TypeScript to Plain JavaScript

Strip types from TypeScript to plain JS.

TypeScript to Declaration (.d.ts)

Generate .d.ts files from TypeScript source.

TypeScript to Zod Schema

Convert TypeScript interfaces to Zod schemas.

JavaScript to TypeScript

Add best-effort type annotations to JS.

Flow to Plain JavaScript

Strip Flow type annotations from source code.

Flow to TypeScript Declaration

Convert Flow types to a TypeScript declaration.

Flow to TypeScript

Convert Flow source to TypeScript (best-effort).

TOML to JSON

Convert TOML config files to JSON.

TOML to YAML

Convert TOML config files to YAML.

YAML to TOML

Convert YAML config files to TOML.

JSON Tree Viewer

Search & explore JSON as a tree.

XML Pretty Print

Pretty-print or minify XML.

YAML Viewer

Explore YAML as a collapsible tree.

CSS Triangle Generator

Generate pure-CSS triangles.

WiFi QR Code Generator

Turn WiFi credentials into a QR code.

Contrast Color Finder

Find the best text color for a background.

Twitter Card Generator

Generate Twitter/X Card meta tags.

CSV Validator

Check CSV structural well-formedness.

Country Code Finder

Find ISO & calling codes by country.

CSS Border Radius Generator

Visually generate border-radius CSS.

SHA-1 Hash Generator

Generate a SHA-1 hash from any text.

Canonical URL Generator

Strip tracking params and generate a canonical tag.

curl Command Generator

Build a properly escaped curl command.

CRC32 Generator

Compute a CRC-32 checksum of text.

HTTP Header Viewer

Parse and explain pasted HTTP response headers.

INI Formatter

Normalize spacing and layout of INI config text.

Regex Replace Tester

Preview find-and-replace output for a regex.

CHMOD Generator

Generate Unix file permission codes.

CSP Generator

Build a Content-Security-Policy header.

Favicon HTML Generator

Generate favicon link and meta tags for your site.

Apple Touch Icon Generator

Crop and resize an image into a 180x180 apple-touch-icon.

CSS Transform Generator

Visually build a CSS transform declaration.

Space to Tab Converter

Convert leading spaces to tabs or tabs to spaces.

File Extension Finder

Look up a file extension's type & MIME.

File Type Identifier

Detect real file type from its bytes.

SHA-512 Hash Generator

Generate a SHA-512 hash from any text.

SHA-384 Hash Generator

Generate a SHA-384 hash from any text.

SHA-224 Hash Generator

Generate a SHA-224 hash from any text.

RIPEMD-160 Generator

Generate a RIPEMD-160 hash from any text.

Adler-32 Generator

Generate an Adler-32 checksum from any text.

CSV Minifier

Shrink CSV by stripping unnecessary whitespace.

TOML Formatter

Reformat TOML into clean, consistent TOML.

SQL Keywords Uppercase

Convert SQL keywords to UPPERCASE.

SQL Keywords Lowercase

Convert SQL keywords to lowercase.

Regex Escape Tool

Escape text for safe use inside a regex.

File Permission Viewer

Parse and explain a Unix ls -l permission string.

HSTS Header Generator

Build a Strict-Transport-Security header.

X-Robots Header Generator

Build an X-Robots-Tag HTTP header.

OpenSearch Generator

Generate an OpenSearch description document.

Manifest.json Generator

Generate a PWA web app manifest.

Browserconfig.xml Generator

Generate a browserconfig.xml for Windows tiles.

CSS Glassmorphism Generator

Build a frosted-glass CSS effect with a live preview.

CSS Neumorphism Generator

Build a soft-UI CSS box-shadow with a live preview.

Language Code Finder

Find ISO 639-1 language codes by name.

ASCII Table Viewer

Browse the full ASCII table with search.

BCrypt Hash Generator

Generate a secure bcrypt password hash.

HTTP Status Code Lookup

Search HTTP status codes by number or keyword.

Folder Structure Generator

Generate an ASCII tree and mkdir/touch shell script.

Browser Tab List Generator

Turn pasted tab URLs into an organized list by domain.