Developer tools generators
Formatters and converters for JSON, SQL, XML, YAML and Base64, a regex tester, UUID generators, CSS snippets and HTTP/API helpers — built to work fast, right in the browser.
92 tools in this category.
.gitignore generator Generate a .gitignore file by combining templates for Node, Python, Java, macOS, VS Code and more. Ready to copy into your repo. Free. .htaccess generator Generate Apache .htaccess rules: 301 redirects, force HTTPS and www, gzip compression, browser cache and security headers. Copy the ready block. Free. AI Name Generator Create tech names for artificial intelligences, virtual assistants, and ML systems. Includes corporate, sci-fi, and custom styles. Algorithm Name Generator Create technical names for algorithms, ML models and prediction systems with scientific resonance. For papers, demos, products and tech narrative. Assassin Name Generator Create stealthy, lethal names for assassins, spies and undercover agents. Perfect for RPG characters, thriller novels and action campaigns. Atomic Design Component Generator Generate consistent React/Vue component names following Atomic Design: atoms, molecules, organisms, templates, and pages. Clear convention for your design system. Base32 encoder / decoder Encode and decode Base32 text (RFC 4648), the format used by TOTP/2FA keys. UTF-8 support and optional padding. Instant and 100% in your browser. Base64 decoder Decode Base64 text to UTF-8 instantly. Supports URL-safe variant and missing padding. Runs entirely in your browser. Base64 encoder Encode text to Base64 instantly. Supports UTF-8, URL-safe variant and files. Runs entirely in your browser, no data sent. Biohacker Alias Generator Generate futuristic aliases for biohackers, transhumanists and human enhancement enthusiasts with tech edge, cyberpunk identity and scientific mystique. Computer Virus Name Generator Create cyberpunk code names for fictional malware and viruses. Perfect for novels, games, and cybersecurity simulations. Conventional Commit Message Generator Generate Conventional Commits messages. Types: feat, fix, docs, refactor, test, chore. Great for automatic release notes. Cron Expression Builder Build cron expressions visually. Pick minutes, hours, days, month and day-of-week without memorizing syntax. Plain-English preview. CSS clamp() Generator Generate the CSS clamp() function for responsive typography and sizing. Set min/max and viewport range, copy the code. CSS Class Name Generator Generate CSS class names following BEM, SMACSS and other methodologies. Keep your code clean, scalable and easy to maintain with proven conventions. CSS Custom Property Generator Organized names for CSS custom properties. Color, spacing, typography variables and more with scalable conventions for modern design systems. CSS Flexbox Generator Generate Flexbox layouts: direction, alignment, justify, wrap and gap. Interactive preview, ready CSS. CSS Grid Generator Generate CSS Grid layouts: columns, rows, gap and areas. Live preview, copy-ready code. CSS Keyframes Generator Generate CSS animations with keyframes: fade, slide, bounce, pulse and custom. Live preview, copy-ready code. CSS Triangle Generator Generate pure CSS triangles without images. Configurable direction, size and color. Useful for tooltips and arrows. CSS Variables Generator Generate a :root with your custom properties: colors, spacing, typography, radii. Ready for your design system. CSV to JSON — Free Converter Turn CSV into a JSON array of objects. Header detection, quote handling and configurable separators. 100% in-browser. CSV to Markdown table Convert CSV data into a Markdown table ready to paste into a README, GitHub or docs. Detects headers and alignment. Instant and free. cURL to code converter Paste a cURL command and get the equivalent code in JavaScript (fetch), Python (requests) and Node. Great for going from terminal to your app. Runs in your browser. cURL to Code Generator Convert cURL commands to Python (requests, httpx), JavaScript (fetch, axios), PHP, Ruby, Go and Rust code. HTTP requests ready for production code. Database Table SQL Builder Generate CREATE TABLE statements with types, keys, indexes and constraints. PostgreSQL, MySQL, SQLite or SQL Server. Docker Container Name Generator Generate random Docker container names like "happy-otter" or "calm-river". Memorable and Docker-naming-rule compliant. Environment Variable Name Generator Generate consistent SCREAMING_SNAKE_CASE environment variable names. Conventions for 12-factor apps. Express Middleware Generator Generate Express middleware names with clear functionality. Perfect for auth, validation, logging, error handling, and Node.js API routes. Feature Flag Name Generator Generate consistent names for feature flags / toggles. Clear convention for LaunchDarkly, Unleash, Flagsmith or homemade flags. File size converter Convert sizes between bytes, KB, MB, GB and TB, in binary (1024) or decimal (1000). Great for dev, hosting and storage. No signup. Free JSON Formatter Format, indent and validate JSON instantly in the browser. Pinpoints syntax errors and shows their exact location. 100% local. Free JSON Minifier Compress JSON to a single line with no spaces. Cuts size by up to 30% for APIs, configs and storage. 100% in-browser. Free SQL Formatter Indent and format SQL queries instantly. Supports SELECT, INSERT, UPDATE, DELETE, JOIN, WHERE and subqueries. 100% in your browser. Free URL Slug Generator Turn any title into a clean URL slug: lowercase, no accents, hyphens, and SEO-safe characters. Perfect for blogs, CMS and routing. Free XML Formatter Indent, format and validate XML instantly in the browser. Handy for SOAP, RSS, sitemaps, Java/Spring configs and legacy responses. Git Branch Name Generator Generate consistent git branch names: feature/, fix/, hotfix/, release/. kebab-case slug and ticket reference. GraphQL Query Sample Generate sample GraphQL queries, mutations and subscriptions with variables, fragments and aliases. GraphQL Schema Generator Generate GraphQL schemas with types, queries, and mutations. Examples of common structures for modern APIs with strong typing. Hackathon Name Generator Create technical and motivating names for hackathons, coding sprints, and programming jams that attract talented developers. Hacker Handle Generator Create ethical hacker handles and aliases for CTFs, bug bounty platforms, infosec communities and cyberpunk characters with authentic identity. Hex to text converter Convert hex to text and text to hex, with UTF-8 support and optional separators. Great for debugging, forensics and CTFs. Instant. HTML entities encoder / decoder Encode and decode HTML entities (&, <, é, ©). Convert special characters, accents and symbols to entities and back. Instant and in your browser. HTML Escape / Unescape — Free Tool Convert special characters (<, >, &, quotes) to HTML entities and back. Useful for displaying code in blogs and preventing XSS attacks. HTML Meta Tags Generator Generate the essential SEO and social meta tags: title, description, Open Graph and Twitter Card. Copy with one click. HTML table generator Build an HTML table with live preview: set rows and columns or paste CSV data, and copy the ready-made code with or without styles. Runs in your browser. HTML to Markdown — Free Converter Turn HTML into clean Markdown in your browser: p, h1-h6, ul, ol, a, img, code, strong, em and more. 100% local. HTTP Security Headers Generator Generate HTTP security headers (CSP, HSTS, X-Frame-Options, Permissions-Policy) with OWASP-recommended values to protect your web application. HTTP Status Code Reference Complete reference of HTTP status codes: 1xx, 2xx, 3xx, 4xx, 5xx. Search by code or category, with description and usage notes. Human-Readable Cron Generator Convert cron expressions to natural language and back. Common examples for Linux, GitHub Actions, Kubernetes and schedulers. Stop fighting crontab.guru. JSON Schema Sample Generator Generate a sample JSON Schema (draft 2020-12) to validate payloads. Types, required fields, formats and patterns ready to copy. JSON to CSV converter Convert a JSON array to CSV ready for Excel or Google Sheets. Detects columns, flattens nested objects and escapes quotes (RFC 4180). Runs in your browser. JSON to TypeScript converter Paste JSON and get typed TypeScript interfaces instantly. Detects types, nested objects, arrays and optionals. Great for APIs. Runs in your browser. JSON to YAML — Free Converter Convert JSON to readable YAML instantly in the browser. Useful for Kubernetes manifests, GitHub Actions, Docker Compose. 100% local. JWT decoder Decode JSON Web Tokens instantly: header, payload and signature. Inspect claims, expiration and algorithm. 100% in your browser. Markdown to HTML — Free Converter Convert Markdown to HTML instantly in your browser: headings, lists, links, code, emphasis and more. Your text never leaves your device. Markdown to plain text Strip Markdown formatting from text: no #, *, links or code blocks left. Great for pasting into emails, social posts or docs. Instant and free. Migration Name Generator Generate consistent database migration names: timestamp + verb + resource. Compatible with Rails, Laravel, Knex and Flyway. Mock JSON Response Generator Generate sample JSON responses to mock APIs during development and testing. Lists, nested objects, pagination. Nano ID generator Generate random, secure, URL-friendly Nano IDs with configurable length and alphabet. A compact alternative to UUID. Runs in your browser. Number base converter Convert numbers between binary, octal, decimal, hexadecimal and any base (2-36). Great for programming, networking and electronics. No signup. Postman Collection Example Generate a Postman v2.1 collection JSON ready to import. Great for kicking off API testing or documenting endpoints. Pull Request Title Generator Generate clear, consistent pull request titles. Compatible with conventional commits and squash merges. Px to Em Converter Convert pixels to em relative to the parent font-size. Ideal for spacing inside components with their own typographic scale. Px to Rem Converter Convert pixel values to rem using a configurable base font size. Quick reference table and copy-ready CSS. Random IP generator Generate random IPv4 and IPv6 addresses for testing, fixtures and configuration. Public, private or specific range. Random MAC generator Generate random MAC addresses with real vendor prefix (Apple, Cisco, Dell) or locally administered. For network testing, fixtures and configuration. Random SQL SELECT Query Generator Generate random SELECT queries with joins, where, group by and order by. Useful for SQL practice and documentation samples. Random string generator Generate random strings with any alphabet: letters, numbers, symbols or a custom set. Ideal for tokens, slugs and test data. Random User Agent generator Generate realistic User Agent strings for Chrome, Firefox, Safari and Edge across operating systems. Useful for testing, scraping research and QA. React Hook Name Generator Generate React custom hook names that follow conventions. Descriptive ideas with 'use' prefix to improve your code readability. React Props Generator Generate idiomatic prop names for React components with TypeScript types. Improve your component API with clear and consistent conventions. README Badge Generator Generate markdown badges for your README with shields.io. Copy and paste build, coverage, version, license badges and more. Instant customization. Redux Reducer Generator Generate Redux reducer names with associated actions. Consistent patterns for state management, async thunks, and architecture best practices. Regex Tester Test regular expressions in real time with match highlighting. JavaScript syntax compatible. 100% local. Rem to Px Converter Convert rem to pixels using a configurable base font size. Ideal for inspecting design system values. REST API Endpoint URL Builder Build REST API endpoints with base URL, resource, path params and query params. Useful for designing and documenting APIs. SASS Variable Generator Generate organized SASS/SCSS variable names following design system patterns. BEM conventions, atomic design and scalable naming for modular CSS. Sitemap.xml Builder Build a sitemap.xml from a list of URLs. Includes lastmod and priorities. Ready for Google Search Console. Space Station Name Generator Generate realistic technical names for orbital stations, space outposts, and habitats. Perfect for sci-fi worldbuilding and space projects. Tailwind Class Shortener Shorten long Tailwind className strings by removing duplicates, sorting them and grouping shorthand. Great for readability and clean diffs. Tech Blog Name Generator Generate modern names for your technology blog. Professional, memorable combinations perfect for quality tech content. Text to binary converter Convert text to binary and binary back to text. Also to hexadecimal and ASCII decimal. UTF-8 support. Instant and 100% in your browser. Text-Based Favicon Generator Generate a favicon from text: pick a letter, background and font color. Download a square PNG ready to drop into any website. TypeScript Decorator Generator TypeScript decorator names for classes, methods, and properties. Ready-to-use inspiration for frameworks like NestJS, TypeORM, and Angular. Copy and apply. TypeScript Enum Generator Generate TypeScript enum names with descriptive, semantic values. Structure your constant types with professional conventions and best practices. TypeScript Function Name Generator Generate TypeScript function names following clean code conventions: clear verbs, specific intent, precise semantics. Ideal for coherent naming. TypeScript Interface Generator Create TypeScript interfaces with correctly typed properties. Examples for API responses, React components, data models, and contracts between layers. Unix timestamp converter Convert Unix timestamps (epoch) to human-readable dates and back. Seconds or milliseconds, UTC and local time. Live current timestamp. Runs in your browser. UUID generator Generate random UUIDs (v4 and v7), one or in bulk. Compatible with databases, APIs and testing. Runs entirely in your browser. UUID v5 generator Generate deterministic UUID v5 from a namespace and a name (SHA-1, RFC 4122). Same input, same UUID: great for reproducible IDs. Runs in your browser. YAML to JSON — Free Converter Turn YAML into JSON instantly in the browser. Supports scalars, lists, nested maps and comments. 100% local.