Essential Developer Tools
Tools in This Collection
JSON Formatter
Beautify or minify JSON with customizable indentation. Validates syntax automatically.
JSON Validator
Validate JSON syntax and see detailed error messages with line numbers.
Regex Tester
Test regular expressions against text. See all matches highlighted with capture groups.
UUID Generator
Generate random UUIDs (v4) instantly. Create one or many unique identifiers with a single click.
Password Generator
Generate strong, random passwords with customizable length, character types, and count.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text using the Web Crypto API.
Base64 Decode
Decode Base64-encoded strings back to plain text instantly.
Cron Expression Generator
Build and explain cron expressions with a visual editor. See the next scheduled run times.
Frequently Asked Questions
- Are these developer tools safe to use with production data?
- Yes. All tools run entirely in your browser — no data is sent to any server. This makes them safe for formatting API responses, testing regex against real payloads, and generating credentials for production environments.
- What UUID version should I use?
- UUID v4 (random) is the most common choice for general-purpose unique identifiers. UUID v7 (time-ordered) is gaining popularity for database primary keys because it preserves insertion order and improves index performance.
- How do I test a regex pattern before using it in code?
- Paste your pattern and test strings into our regex tester to see matches highlighted in real time. It supports all JavaScript regex features including capture groups, lookaheads, and flags.