Generate random numbers, strings, UUIDs, hex colors, names, dates, emails, and more. Cryptographically secure, fully customizable, with bulk generation.
Random data generation is a fundamental tool in software development, testing, cryptography, and data science. From generating unique identifiers and test data to creating secure tokens and sampling datasets, randomness plays a critical role in modern computing.
Pseudorandom number generators (PRNGs) like JavaScript's Math.random() produce numbers that appear random but follow a deterministic algorithm. For most applications — games, simulations, UI testing, and data sampling — PRNGs are sufficient.
For security-sensitive applications — encryption keys, session tokens, password salts, and OTP codes — you need cryptographically secure random number generators (CSPRNGs). The Web Crypto API's crypto.getRandomValues() provides this level of security in browsers.
UUIDs (Universally Unique Identifiers) are 128-bit values formatted as 32 hex digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000). UUID v4 uses random generation and is statistically guaranteed to be unique — the probability of collision is negligible (1 in 2^122).
When generating test data, use realistic-looking values (proper name formats, valid email patterns, sensible date ranges) to ensure your tests accurately simulate production scenarios.