Random ID Generator
Prefixed random identifiers for test data.
1 – 128
1 – 1000
About Random ID Generator
The Random ID Generator produces prefixed identifiers like id_x8k2m9q4 — the style popularized by Stripe (cus_…, sub_…) and now common across APIs. The prefix makes test data self-describing: you can tell at a glance in logs whether an id belongs to a user, an order or a session.
Set your prefix, the length of the random part and how many you need. It is a fast way to mint realistic, readable identifiers for fixtures, seed scripts and exploratory API testing.
How to use
- Enter the "Prefix" your ids should carry (for example user_ or ord_).
- Set "Random length" — how many random characters follow the prefix.
- Choose "How many" ids to create and click "Generate IDs".
- Copy the results from "Generated IDs" into your fixtures or requests.
Frequently asked questions
Why prefix ids at all?
Prefixes make ids self-identifying in logs, bug reports and databases — cus_a8x2 is obviously a customer. They also prevent an id from one entity type being accepted where another was expected, a real class of bug worth testing.
How long should the random part be?
Longer means more collision resistance: 8 characters is fine for small test datasets; 16+ approaches UUID-level uniqueness. For production systems, follow whatever your API contract specifies.
Are these ids predictable?
They are generated for test-data convenience, not as security tokens. For credentials or session tokens, use the Random String Generator with a long length — and in production, a vetted crypto library.