चरण-दर-चरण UUID कैसे उत्पन्न करें
Quick Answer
UUID उत्पन्न करने के लिए: UUID Generator खोलें, संस्करण 4 (random) चुनें और Generate क्लिक करें। टूल crypto.getRandomValues से "550e8400-e29b-41d4-a716-446655440000" जैसा UUID बनाता है। सारा जनरेशन स्थानीय है।
Introduction
UUID (Universally Unique Identifier) एक 128-bit identifier है जो बिना समन्वय के व्यावहारिक रूप से अद्वितीय होता है। UUID डेटाबेस primary key, request ID, session token और वितरित सिस्टम identifier के रूप में व्यापक उपयोग होते हैं। सबसे आम संस्करण UUID v4 है जो random bits उपयोग करता है।
Step by Step
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Open the UUID Generator tool
Go to the UUID Generator tool page. The tool supports UUID v4 (random) and v1 (time-based) generation.
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Select the UUID version
Choose UUID v4 for most use cases — it uses cryptographically secure random bits and has no privacy concerns. Choose v1 only if you need time-ordered IDs and accept the privacy tradeoff (v1 embeds a timestamp and MAC address).
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Choose the quantity
Set how many UUIDs you want to generate — from 1 to 1000. Generating multiple UUIDs at once is useful for seeding a database or creating batch request IDs.
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Generate the UUIDs
Click Generate. The tool produces UUID(s) using crypto.getRandomValues for v4, ensuring cryptographic randomness. Each UUID is a 36-character string in the format 8-4-4-4-12 hex digits.
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Copy the UUID(s)
Click Copy to copy a single UUID, or copy the entire list if you generated multiple. Use the UUID as a database ID, request correlation ID, or session token.
Examples
UUID v4 (random)
Input: Version: 4, Quantity: 1
Output: 550e8400-e29b-41d4-a716-446655440000
Multiple UUID v4
Input: Version: 4, Quantity: 3
Output: f47ac10b-58cc-4372-a567-0e02b2c3d479
7b582ea2-1f4d-4f6a-9c83-3a5f2b8e1d47
3d4a5b6c-7e8f-4a2b-9c1d-0e3f5a7b9c2d
UUID v1 (time-based)
Input: Version: 1, Quantity: 1
Output: a3bbf0ee-d6e4-11ed-a5b3-3c9703e8b4a1
Common Problems
- Using Math.random() to generate UUIDs —it is not cryptographically secure. Always use crypto.getRandomValues() or crypto.randomUUID().
- Storing UUIDs as strings in databases —UUIDs stored as UUID type (16 bytes) are more efficient than strings (36 bytes).
- Using v1 in security-sensitive contexts —v1 embeds a timestamp and MAC address, which can leak information. Use v4 for anonymity.
- Assuming UUIDs are truly unique —they are practically unique (collision probability is negligible), but not guaranteed unique.
Tips
- Use UUID v4 for almost all use cases —it is random, has no privacy concerns, and is supported by all modern databases.
- Use crypto.randomUUID() in modern browsers for a built-in v4 generator without a library.
- Store UUIDs as UUID/GUID type in databases (16 bytes) instead of strings (36 bytes) for better storage and index performance.
- Use UUIDs as request IDs for distributed tracing —they correlate requests across services without central coordination.