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JSON, Base64, regex, and coding utilities — 32 free tools, all processing client-side for maximum privacy. No sign-up, no limits, no data collection.
Our Developer Tools are built by developers, for developers. Format JSON, test regex patterns, decode JWTs, compare code diffs, build cron expressions, and more — all running natively in your browser. No API calls, no data leaks, no rate limits.
Modern software development requires a reliable toolkit that is always within reach. CodelithLabs Developer Tools provide browser-based utilities that eliminate the need for local CLI installs, desktop apps, or cloud-hosted services that may log your data. Our JSON Formatter prettifies, validates, and minifies JSON with syntax highlighting and error pinpointing — perfect for debugging API responses or preparing configuration files.
The Regex Tester provides real-time match highlighting with capture group extraction and built-in cheat sheet, saving developers hours of trial-and-error on complex pattern matching. Our JWT Decoder lets you inspect token headers and payloads instantly — without sending them to a third-party server, which is critical when working with auth tokens containing user PII. The Cron Expression Generator converts human-readable schedules into cron syntax with a live preview of the next five execution times.
Our API Tester offers a Postman-like interface for GET, POST, PUT, and DELETE requests with custom headers, request bodies, and response inspection — entirely from a browser tab. The Code Diff tool compares two code snippets with line-by-line highlighting. JS and CSS Minifiers reduce file size for production builds. Every developer tool on CodelithLabs processes data client-side, ensuring your proprietary source code, secret tokens, and API keys never leave your machine.
Format, beautify, and validate JSON data with syntax highlighting.
Test and debug regular expressions with real-time match highlighting, capture groups, and flags support — all processed client-side in your browser.
Decode and inspect JSON Web Tokens without verification.
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats instantly. Visual color picker with live preview and one-click copy for designers and developers.
Test REST API endpoints with custom methods, headers, and body — like Postman in your browser.
Build cron expressions visually with human-readable descriptions and upcoming run times.
Convert HTML to React JSX — transforms class→className, styles→objects, self-closes tags.
Compare two texts side by side and see additions, removals using LCS algorithm.
Explore JSON data, discover all paths, and query values using JSONPath-like syntax.
Choose from common regex patterns or build your own with real-time testing.
Create professional GitHub README files with badges, features, and installation steps.
Create beautiful linear, radial, and conic gradients with live preview and copy-ready CSS.
Strip TypeScript type annotations, interfaces, and generics to get clean JavaScript code.
Auto-generate JSON Schema (Draft-07 / 2020-12) from any JSON object with nested definitions.
Convert SQL SELECT statements to MongoDB find/aggregate queries with projections and sorting.
Build GraphQL queries, mutations, and fragments visually without writing raw syntax.
Generate docker-compose.yml files visually with service presets for Nginx, Postgres, Redis, and more.
Parse, edit, and export .env files visually. 100% client-side — your secrets never leave your browser.
Generate .gitignore files by selecting languages and frameworks. Combine templates and download instantly.
Calculate Linux file permissions visually. Toggle read/write/execute and get octal + symbolic notation.
Searchable reference for all HTTP status codes (1xx–5xx) with descriptions, causes, and examples.
100+ ready-to-use regex patterns for email, phone, URL, dates, IP, and more. Copy and test instantly.
Convert HTML to clean Markdown format. Preserves links, images, and formatting.
Generate TypeScript interfaces from JSON data. Supports nested objects and arrays.
Convert SQL DDL statements to Prisma schema format for modern database workflows.
Convert vanilla CSS to Tailwind CSS classes. Map common CSS properties to utility classes.
Check NPM package stats, downloads, dependencies, and security vulnerabilities.
Convert cURL commands to JavaScript fetch code. Supports headers, body, and auth.
Generate Go struct definitions from JSON data with proper field tags.
Convert images to Base64 encoded data URIs for embedding in HTML/CSS.
Generate complex Git commands with visual interface. Supports branching, rebasing, cherry-pick.
Convert .env environment files to JSON format and vice versa.