UUID जनरेटर

UUID क्या हैं और ये क्यों ज़रूरी हैं?

A UUID (Universally Unique Identifier), also called a GUID (Globally Unique Identifier), is a 128-bit identifier standardised in RFC 4122. The core guarantee is that a UUID generated independently on any machine will never collide with another UUID — without coordination between systems. This makes UUIDs essential for distributed databases, microservices, event sourcing, and any context where you need an ID before inserting into a database or coordinating with a central server.

UUID Versions समझाए गए

• UUID v4 (Random) — 122 bits of cryptographic randomness. No timestamp component. The most widely used version because it reveals nothing about creation time or location. Use this when uniqueness and privacy matter more than sortability.
• UUID v1 (Timestamp + MAC) — Encodes a 60-bit Gregorian timestamp (100-nanosecond intervals since Oct 15, 1582) plus a node ID. This implementation uses a random node (multicast bit set) to protect privacy. Chronologically sortable within the same node.
• UUID v7 (Unix Epoch, RFC 9562) — 48-bit Unix millisecond timestamp in the first 6 bytes, 74 bits of randomness thereafter. Naturally sortable by database B-tree indexes. The recommended replacement for v1 in new applications.

वैकल्पिक ID फ़ॉर्मेट

• ULID (Universally Unique Lexicographically Sortable Identifier) — 10-character Crockford Base32 timestamp (48 ms) + 16-character random component = 26 characters total. Lexicographically sortable, case-insensitive, and 30% shorter than a UUID with hyphens.
• NanoID — URL-safe, compact, configurable length. Uses rejection sampling to eliminate modulo bias. Default 21 characters with alphanumeric alphabet achieves approximately 126 bits of collision resistance.
• CUID2 — Collision-resistant, fingerprint-resistant. Always starts with a letter, lowercase only, suitable for HTML IDs and CSS class names. Good default for JavaScript applications.
• Short ID — Human-readable configurable-length IDs from multiple character sets. Useful for order numbers, referral codes, and user-facing references.
• Custom Template — Combine any of the above generators with static text, timestamps, and sequence numbers using a simple {token} syntax.

Output Formats

Generated IDs can be exported in 8 formats ready to paste directly into your code: plain text (one per line, click-to-copy), JSON array, JSON object array (with a configurable key), CSV (with header), SQL INSERT statement (configurable table and column), XML, TypeScript const array, and Python list.

UUID Parser & Validator

The Parser tab accepts any UUID string — with or without hyphens, in URN format (urn:uuid:…), or wrapped in braces. It extracts the version and variant, decodes the embedded timestamp for v1 and v7 UUIDs, renders a colour-coded segment breakdown, and shows 7 alternative representations including Base64 and integer encoding.

Collision Tester

The Collision Test generates up to 1 million UUIDs and checks every single one against a Set for duplicates. The test runs in non-blocking 5,000-ID chunks so the browser stays responsive. After completion it displays the theoretical collision probability alongside the empirical result.

Cryptographic Randomness

All generators on this tool use crypto.getRandomValues() — the browser's cryptographically secure pseudo-random number generator (CSPRNG). Math.random() is never used. NanoID uses rejection sampling to eliminate modulo bias. This means every ID is as random as your browser's entropy pool allows.

गोपनीयता

All generation happens locally in your browser. No IDs, templates, or custom formats are sent to any server. Saved templates are stored only in your browser's localStorage and never leave your device.