UUID v5 Generator for Developers (Namespace-Based, Deterministic UUIDs)
UUID v5 is the preferred choice for deterministic, repeatable identifiers in modern systems. Unlike random UUIDs, UUID v5 generates the same UUID every time for the same namespace and name, making it ideal for distributed systems, caching layers, APIs, and databases.
Use the fast, secure, browser-based UUID v5 Generator at
👉 https://langstop.com/uuid-generator/v5
What Is UUID v5?
UUID v5 is a name-based UUID generated using:
- SHA-1 hashing
- A namespace UUID
- A unique name (string)
This ensures:
- 🔁 Deterministic output
- 🌍 Global uniqueness across namespaces
- 🧠 Predictable identifiers without storage
UUID v5 vs UUID v4 (Why v5 Matters)
| Feature | UUID v4 | UUID v5 |
|---|---|---|
| Generation | Random | Deterministic |
| Repeatable | ❌ No | ✅ Yes |
| Namespace Support | ❌ No | ✅ Yes |
| Best For | Temporary IDs | Stable system identifiers |
If you need idempotency, UUID v5 is the correct choice.
Key Features of UUID v5 Generator
- ⚡ Instant UUID v5 generation
- 📦 Single UUID v5 generator
- 📊 Bulk UUID v5 generator
- 🌐 Runs fully in the browser
- 🔐 No data stored or transmitted
- 🧪 Perfect for testing & production use
Try it here:
👉 https://langstop.com/uuid-generator/v5
When Should You Use UUID v5?
UUID v5 is ideal when:
- You want consistent IDs across environments
- You generate IDs from usernames, emails, URLs, or keys
- You need stateless ID generation
- You work with microservices or distributed systems
Common UUID v5 Namespaces
UUID v5 requires a namespace. Common ones include:
- DNS Namespace
- URL Namespace
- OID Namespace
- X.500 Namespace
- Custom application-defined namespaces
Using a namespace prevents collisions across domains.
How UUID v5 Works (Step-by-Step)
- Choose a namespace UUID
- Provide a name string
- Apply SHA-1 hashing
- Format output as a UUID v5
The same namespace + name = the same UUID, always.
UUID v5 Example Output
Input:
- Namespace: DNS
- Name: example.com
Output:
cfbff0d1-9375-5685-968c-48ce8b15ae17
This output will never change for the same inputs.
How to Generate UUID v5 in JavaScript
import { v5 as uuidv5 } from "uuid";
const NAMESPACE = uuidv5.DNS;
const name = "example.com";
const uuid = uuidv5(name, NAMESPACE);
console.log(uuid);Bulk UUID v5 Generation Example
import { v5 as uuidv5 } from "uuid";
const namespace = uuidv5.URL;
const names = ["user1", "user2", "user3"];
const uuids = names.map(name => uuidv5(name, namespace));
console.log(uuids);This mirrors the Bulk UUID v5 Generator available at
👉 https://langstop.com/uuid-generator/v5
UUID v5 in Databases
UUID v5 is perfect for:
- Stable primary keys
- Idempotent inserts
- Cross-system consistency
- Event sourcing identifiers
Since the UUID is deterministic, duplicates are naturally avoided.
UUID v5 Security Considerations
- SHA-1 is used for uniqueness, not encryption
- Do not use UUID v5 for secrets or tokens
- Safe for identifiers, keys, and references
UUID v5 Tooling for Modern Dev Stacks
UUID v5 integrates seamlessly with:
- Next.js APIs
- Node.js services
- PostgreSQL / MySQL
- Microservices
- CI/CD pipelines
No server required when using browser-based tools.
Frequently Asked Questions (FAQs)
Is UUID v5 better than UUID v4?
For deterministic IDs, yes. For random IDs, use v4.
Can UUID v5 collide?
Only if namespace + name are identical.
Is UUID v5 safe for production?
Yes, for identifiers (not secrets).
Can I generate UUID v5 in bulk?
Yes. Use the bulk generator at
👉 https://langstop.com/uuid-generator/v5
Does UUID v5 change over time?
No. It is fully deterministic.
Final Thoughts
UUID v5 is the go-to standard for predictable, namespace-based identifiers. Whether you're building APIs, databases, or distributed systems, a UUID v5 generator simplifies consistency and reliability.
Use the fast, privacy-friendly UUID v5 generator now:
👉 https://langstop.com/uuid-generator/v5