Developer Utilities

54 free, in-browser developer tools — formatters, converters, generators, and encoders. No signup, no server round-trip, no rate limits.

54 tools
6 categories
100% client-side

Text & Search

Regex Tester Test regular expressions with live match highlighting. Diff Checker Compare two blocks of text or code side-by-side. Case Converter Convert text between camelCase, snake_case, kebab-case, and more.

Formatting & Data

JSON Formatter & TS Format, validate, and convert JSON to TypeScript types. JSONPath Evaluator Query JSON documents with JSONPath expressions. YAML ↔ JSON Convert between YAML and JSON. SQL → Prisma / Drizzle Convert SQL DDL tables to Prisma, Drizzle ORM, and TypeORM schemas. GraphQL to TypeScript Convert GraphQL schema SDL to type-safe TypeScript interfaces and resolvers. SemVer Calculator & Tester Plan version bumps and test npm/cargo caret (^) and tilde (~) range resolution. Tailwind v3 ↔ v4 Theme Migrate tailwind.config.js to modern Tailwind CSS v4 @theme variables. SQL Formatter Format and beautify SQL queries. SVG to JSX / React Convert SVG to clean React, Vue, Svelte, or React Native components. HTML Entity Encoder Encode and decode HTML entities. String Escaper Escape and unescape strings for code, JSON, and shells. CSV ↔ JSON Convert between CSV and JSON, with proper quoted-field handling. Markdown Previewer Live Markdown to HTML preview with copyable output.

Web & Networking

URL Parser & Encode Parse, encode, and decode URLs and query strings. cURL to Code Convert cURL commands into code in multiple languages. Docker Run ↔ Compose Convert between docker run commands and Compose files. Dockerfile Optimizer Audit Dockerfiles for security, caching, and generate multi-stage builds. CIDR Calculator Calculate subnet ranges and host counts from CIDR blocks. HTTP Status Codes Search, compare, and troubleshoot HTTP status codes and semantics. CORS Preflight Simulator Simulate CORS preflight headers and generate server middleware. HTTP Security Headers Audit security header grades and generate Nginx, Apache, and Caddy configs. Webhook Signature Verifier Verify Stripe, GitHub, Shopify, and Svix webhook HMAC SHA-256 signatures. OAuth 2.0 PKCE Generator Generate code_verifier, code_challenge, and OAuth 2.0 authorization URLs.

Encoding & Crypto

Hash & Checksum Generate MD5, SHA-1, SHA-256, and other hash digests. Bcrypt Generator Hash and verify passwords with bcrypt. RSA Key Generator Generate RSA public/private key pairs. Base64 & URL Encode and decode Base64 and Base64URL strings. JWT Decoder Decode and inspect JWT header, payload, and signature. JWT Generator Generate signed JWTs for testing. SSL/TLS Cert Decoder Decode and inspect SSL/TLS certificates. CSP Header Builder Build and validate Content Security Policy (CSP) headers. SRI Hash Generator Generate Subresource Integrity (SRI) hashes for script and link CDN tags. Password Generator Generate strong random passwords with an entropy strength meter.

System & Generators

Mock Data Generator Generate realistic fake data for testing. Chmod Calculator Calculate and explain Unix file permission codes. UUID / NanoID / ULID Generate UUID v4/v7, NanoID, and ULID identifiers. UUIDv7 / Snowflake Decoder Decode timestamps and worker IDs from UUIDv7, Twitter Snowflake, and ULID. KeyCode Inspector Inspect JavaScript keyboard events, key codes, and modifier keys. SPF / DKIM / DMARC Generate and validate email DNS records for anti-spoofing and deliverability. AWS IAM Visualizer Visualize AWS IAM policy permissions. .gitignore Generator Generate a .gitignore from curated language and tool templates.

Time & Design

Unix Epoch Suite Convert Unix timestamps to and from human-readable dates. Cron Translator Translate cron expressions into plain English. Cron Visualizer & Timeline Visualize upcoming cron execution timelines and build schedules visually. CSS clamp() Calculator Calculate fluid typography and responsive spacing with CSS clamp(). Glassmorphism Studio Design frosted glass CSS cards with live backdrop blur and refraction. Smooth Shadow Studio Create smooth multi-layered realistic CSS and Tailwind box shadows. Aspect Ratio & Srcset Sizer Calculate aspect ratios, responsive dimensions, and retina image srcsets. Font unicode-range Sizer Generate @font-face unicode-range rules to subset web fonts for performance. Color & Contrast Convert colors and check contrast ratios for accessibility. Timezone Converter Compare a time across multiple timezones for scheduling.

About the Developer Utilities Suite

A collection of 54 everyday developer tools — text and data formatters, encoders, hash and key generators, and network/system utilities — built to run entirely in your browser. Nothing you paste or generate here is sent to a server.