Developer Tools
Free online developer tools — format, validate, encode, and convert code and data formats.
Our developer tools help programmers and web developers work faster without leaving the browser. Format and validate JSON, encode and decode Base64, generate hashes, test regular expressions, create URL slugs, and more. Every tool runs locally in your browser — no server uploads, no API keys, no signups. Whether you're debugging an API response, preparing data for a database, or prototyping a feature, these utilities save you from context-switching to desktop apps or running one-off scripts. Designed for daily use by frontend engineers, backend developers, DevOps teams, and anyone who works with structured data.
JSON Formatter
Format and beautify JSON data with syntax highlighting and tree view.
JSON Validator
Validate JSON syntax and identify errors with line and column numbers.
JSON Viewer
View JSON data in an interactive collapsible tree structure.
JSON Minifier
Minify JSON by removing whitespace and compressing the output.
XML Formatter
Format and beautify XML data with syntax highlighting.
HTML Beautifier
Format and beautify HTML code with proper indentation.
CSS Beautifier
Format and beautify CSS code with proper indentation and spacing.
JS Beautifier
Format and beautify JavaScript/TypeScript code.
YAML to JSON
Convert YAML data to JSON format instantly.
JSON to YAML
Convert JSON data to YAML format instantly.
Base64 Encoder
Encode text or files to Base64 format.
Base64 Decoder
Decode Base64 strings back to their original format.
URL Encoder
Encode text for safe use in URLs by converting special characters.
URL Decoder
Decode URL-encoded strings back to readable text.
JWT Decoder
Decode and inspect JWT tokens to view header, payload, and signature.
Regex Tester
Test and debug regular expressions with real-time match highlighting.
UUID Generator
Generate random UUID v4 identifiers instantly.
SHA256 Generator
Generate SHA-256 hash from any text input.
SHA512 Generator
Generate SHA-512 hash from any text input.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text.
Diff Checker
Compare two text files side-by-side and highlight differences.
Cron Expression
Build and validate cron expressions with human-readable explanations.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
QR Generator
Create custom QR codes for URLs, text, and more.
Frequently Asked Questions
Are these developer tools free to use?
Yes, all developer tools are completely free. There are no usage limits, no signups, and no ads that block functionality. Use them as often as you need.
Is my data sent to a server?
No. Every tool runs entirely in your browser using JavaScript. Your code, JSON, and data never leave your device, making these tools safe for sensitive or proprietary information.
Can I use these tools offline?
Once the page is loaded, most tools work offline since all processing happens client-side. You can even save the page for offline use in your browser.