Developer Tools
Essential utilities for software developers and engineers
JSON Formatter & Validator
Format, beautify, minify, and validate JSON data online with instant error detection.
Password Generator
NEWGenerate strong, secure passwords with customizable length, symbols, and complexity.
Regex Tester & Debugger
NEWTest and debug regular expressions with real-time matching, highlighting, and explanation.
UUID Generator
NEWGenerate UUIDs (v4) instantly. Bulk generate, copy, and use in your projects.
Hash Generator (MD5, SHA)
NEWGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes from text instantly.
Text Diff Checker
NEWCompare two texts and see the differences highlighted. Side-by-side or inline view.
QR Code Generator
NEWGenerate QR codes for URLs, text, WiFi, and more. Download as PNG or SVG.
JavaScript Minifier
NEWMinify JavaScript code to reduce file size and improve load times.
Cron Expression Builder
NEWBuild and understand cron expressions visually. Schedule tasks with a human-readable editor.
JWT Decoder
NEWDecode and inspect JWT tokens. View header, payload, and verify signature.
HTML Beautifier
NEWFormat and beautify messy HTML code with proper indentation and structure.
Markdown Preview Editor
NEWLive markdown editor with instant HTML preview. Split-view with real-time rendering of headings, bold, italic, code, links, and lists.
Chmod Calculator
NEWCalculate Unix/Linux file permissions interactively. Convert between numeric (755) and symbolic (rwxr-xr-x) notation.
Crontab Generator
NEWBuild cron expressions visually with dropdowns. See next 5 run times and human-readable schedule descriptions.
IP Address Info & Analyzer
NEWAnalyze IP addresses: class (A/B/C/D/E), binary representation, subnet mask, private/public check, IPv4/IPv6 detection.
Interactive ASCII Table
NEWBrowse all 128 ASCII characters with search and filter. Click any character for decimal, hex, octal, binary, and HTML entity values.
HTTP Status Codes Reference
NEWBrowse all HTTP status codes with descriptions, use cases, and quick search filtering.
JSONPath Tester
NEWTest JSONPath expressions against JSON data with real-time matching and result highlighting.
SQL Formatter
NEWFormat and beautify SQL queries with proper indentation, keyword uppercasing, and syntax highlighting.
HTML Table Generator
NEWGenerate HTML table markup visually with custom rows, columns, headers, and styling options.
XML Formatter
NEWFormat, beautify, and validate XML data with proper indentation and syntax highlighting.
Unix Permissions Converter
NEWConvert between numeric and symbolic Unix file permissions with interactive toggles.
JSON Minifier
NEWMinify JSON by removing whitespace and formatting to reduce file size for production use.
Fake Data Generator
NEWGenerate realistic fake data for testing including names, emails, addresses, and phone numbers.
JSON Tree Viewer
NEWVisualize JSON data as an interactive collapsible tree with search and path copying.
Regex Pattern Library
NEWBrowse and copy common regex patterns for emails, URLs, dates, IPs, and more.
.htaccess Generator
NEWGenerate Apache .htaccess rules for redirects, caching, security headers, and URL rewriting.
Nginx Config Generator
NEWGenerate Nginx server configuration blocks for reverse proxy, SSL, caching, and redirects.
Docker Compose Generator
NEWBuild Docker Compose YAML files visually with service definitions, volumes, and networks.
.gitignore Generator
NEWGenerate .gitignore files for popular languages, frameworks, and IDEs with template selection.
README Generator
NEWGenerate professional README.md files with sections for installation, usage, API, and badges.
JWT Token Generator
NEWGenerate JWT tokens with custom claims, expiration, and algorithm selection for testing APIs.
.env File Editor
NEWEdit and validate .env environment files with syntax highlighting and variable management.
API Response Formatter
NEWFormat and prettify API responses in JSON, XML, and other formats with syntax highlighting.
YAML Validator
NEWValidate YAML syntax with detailed error messages, line highlighting, and auto-formatting.
Essential Developer Utilities for Everyday Workflows
Every developer knows the frustration of switching between multiple websites and applications to accomplish routine tasks. Our free online developer tools bring together the most commonly needed utilities in one place, so you can format JSON, test regular expressions, generate secure passwords, and more without leaving your browser. All tools run entirely client-side, meaning your code and data never leave your machine.
The JSON formatter and validator is one of our most popular tools. Paste raw or minified JSON and instantly see it formatted with proper indentation and syntax highlighting. The validator catches errors like missing commas, unmatched brackets, and invalid escape sequences, pinpointing the exact line and character where the problem occurs. You can also minify formatted JSON for use in API requests or configuration files.
Building and debugging regular expressions is notoriously difficult. Our regex tester provides a real-time testing environment where you can write patterns and immediately see matches highlighted in your test string. The tool supports all standard regex flags (global, case-insensitive, multiline, dotAll) and displays capture groups, making it invaluable for data parsing, form validation, and text processing tasks.
Security-conscious developers will appreciate our password generator and hash generator. The password generator creates cryptographically random passwords with customizable length and character sets (uppercase, lowercase, numbers, and symbols). The hash generator computes MD5, SHA-1, SHA-256, and SHA-512 hashes for any text input, useful for verifying file integrity or creating checksums.
Additional tools include a UUID generator for creating unique identifiers, a diff checker for comparing two blocks of text or code side by side, a JWT decoder for inspecting JSON Web Tokens without needing to visit jwt.io, and a QR code generator for encoding URLs, text, or contact information. Each tool is designed with a clean interface, instant results, and zero data collection.
Frequently Asked Questions
What developer tools are available?
We offer a comprehensive suite including a JSON formatter and validator, regex tester, password generator, UUID generator, hash generator (MD5, SHA-1, SHA-256, SHA-512), diff checker for comparing text, JWT decoder, and QR code generator. All tools are free, require no signup, and run entirely in your browser.
Can I format JSON online for free?
Yes. Our JSON formatter lets you paste minified or messy JSON and instantly formats it with proper indentation and syntax highlighting. It also validates your JSON and reports any errors with the exact location, making it easy to debug API responses, configuration files, and data structures.
How do I test regex patterns?
Enter your regular expression pattern in the regex tester along with a test string. Matches are highlighted in real time as you type. The tool supports global, case-insensitive, multiline, and dotAll flags, and displays named and numbered capture groups so you can refine your patterns quickly.
Is the password generator secure?
Yes. The password generator uses the Web Crypto API (crypto.getRandomValues) to produce cryptographically secure random values. Passwords are generated entirely in your browser and are never transmitted to any server. You can customize length, character types (uppercase, lowercase, numbers, symbols), and generate multiple passwords at once.
Do developer tools store my data?
No. All of our developer tools process data entirely within your browser using client-side JavaScript. No code, passwords, JSON data, or any other input is ever sent to our servers. Your data stays on your machine, making these tools safe to use with sensitive or proprietary information.