UUID

What this does

Returns a freshly generated UUID version 4 string: a random 128-bit identifier that is vanishingly unlikely to collide with another. No parameters needed. Call it whenever you need an ID for a record, session, or file.

Who it is for

• Database primary keys before insert
• Correlation IDs in logs and support tickets
• File upload names that must be unique
• Prototypes that need realistic IDs

Try it

https://fetch.li/v1/uuid

Each request returns a new value.

HTTP example

GET /v1/uuid HTTP/1.1
Host: fetch.li
Accept: application/json

curl

curl -sS "https://fetch.li/v1/uuid"

JavaScript fetch

const response = await fetch("https://fetch.li/v1/uuid");
const { uuid } = await response.json();
console.log(uuid);

Python requests

import requests

response = requests.get("https://fetch.li/v1/uuid")
response.raise_for_status()
print(response.json()["uuid"])

Example JSON response

{
  "uuid": "0b3e1c2a-7d44-4f1a-9c8a-2a6f4d1e9b10",
  "version": 4,
  "generated_at": "2026-08-25T11:43:00.000Z"
}

Parameters

This endpoint accepts no query parameters.

Errors that can happen

Demo

GET endpoints work without an API key on the public demo tier (60 calls per hour per IP). POST /v1/vibe/classify needs a key.