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.