Dev Tools Lab

Dev Tools Lab includes five browser-based developer utilities: JSON Formatter & Validator (format, validate, minify, and explore JSON data with tree view), Regex Tester (test regular expressions with real-time matching, capture groups, and 5 flag toggles), Hash & Encode Toolkit (generate SHA-1/SHA-256/SHA-512 hashes, encode/decode Base64, URL, and HTML, and decode JWT tokens), Password & QR Generator (create cryptographically secure passwords with strength meter and generate QR codes for text, URLs, email, phone, and WiFi), and Diff Checker (compare two texts line-by-line or word-by-word with color-coded highlights and statistics).

No. All Dev Tools work entirely in your browser with no server-side processing. You can use them without creating an account or logging in. No data is sent to any server — everything stays private on your device. This also means there are no usage limits, unlike AI-powered tools that have daily restrictions due to API costs.

No. Unlike AI-powered tools that have daily limits due to API costs, Dev Tools run 100% in your browser. There are no daily usage limits, no credits required, and no restrictions on how many times you can use them. They are completely free and unlimited — use them as much as you need, anytime.

The Password Generator uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically secure random numbers — the same standard used by professional password managers like 1Password and Bitwarden. Unlike Math.random() which is predictable, crypto.getRandomValues() is designed specifically for security. The generated passwords never leave your browser, and you can customize length (8-128 characters), character types, and exclude ambiguous characters like I, l, 1, O, 0, o.

Yes, all Dev Tools are responsive and work in any modern mobile browser. The Password Generator and Hash & Encode tools work great on mobile devices. Tools like the JSON Formatter and Diff Checker are easier to use on desktop due to the larger screen and keyboard input, but they remain fully functional on mobile. The Regex Tester's preset patterns and cheat sheet are particularly handy for quick regex checks on the go.

The Hash & Encode Toolkit supports SHA-1, SHA-256, and SHA-512 hash generation using the browser's Web Crypto API. SHA-256 is recommended for most use cases as it's widely used, fast, and secure. SHA-512 provides stronger security for sensitive applications. SHA-1 is included for legacy compatibility but is not recommended for new cryptographic use. MD5 is not available in browsers due to known vulnerabilities. The toolkit also includes Base64 encode/decode, URL encode/decode, HTML encode/decode, and JWT token decoding.

The Diff Checker uses the Longest Common Subsequence (LCS) algorithm — the same foundation used by professional tools like Git diff. It supports two comparison modes: Line-by-Line (best for code and structured files where each line is a meaningful unit) and Word-by-Word (best for prose and articles where changes within a line matter). Results are color-coded: green for additions, red for deletions, with statistics showing the number of added, deleted, and unchanged lines.

Absolutely. All Dev Tools process data entirely in your browser using built-in JavaScript APIs. No data — including JSON payloads, regex patterns, passwords, hash inputs, or text comparisons — is ever sent to any server, API, or cloud service. Your data stays completely private on your device. This makes these tools safe for use with sensitive data like API keys, configuration files, and authentication tokens.