GUIDs or UUIDs are crucial for unique IDs in distributed systems or browser-based applications. Modern JavaScript offers `crypto.randomUUID()` in secure contexts (HTTPS/localhost) for generating compliant UUIDs. For legacy browsers, use `crypto.getRandomValues`. Avoid using `Math.random()` due to poor randomness. Third-party libraries are recommended for production. Validate UUIDs against RFC 4122 if using custom methods.
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