scriptiii
100% Client-Side

Seeded · synthetic · offline

Mock JSON generator

Fake rows with a reproducible seed — for tests, seeds and prototypes that need realistic shape without real people in them.

Rows are generated in this tab from in-repo word lists. Nothing is requested or stored.

Same seed, same rows — that is what makes it a fixture.

Fields

Short answer: pick the fields, set a row count and a seed, then copy the JSON or CSV. The same seed always regenerates the same rows, and every address is an example.com one so nothing in the output can reach a real inbox.

What “seeded” buys you

Test fixtures and screenshots need stable data: a table that reorders on every reload makes a visual diff useless. A seeded generator produces the same values every time, so the fixture can be committed and reviewed like code.

Where the line is

This is prototype data. It has no relationships — no order belongs to a customer, no date follows another — because inventing plausible joins is a database problem, not a text problem. When a prototype needs real relationships, generate the rows here and wire the links in code.

Mock data questions

Why a seed instead of pure randomness?

The same seed and the same field list always produce the same rows. That makes the output usable as a fixture — paste it into a test and it stays valid next week, which random data never is.

Is any of this real data?

No. Names come from small in-repo word lists, every email uses example.com, and phone numbers are generated in the Indian mobile range without belonging to anyone. There is no database and no API call.

How many rows can I generate?

Up to 500 rows per run. That is enough for a table layout or a paging prototype, and it keeps the browser responsive — the limit is stated on the page rather than discovered by freezing the tab.

Can I use the output in production?

Use it for tests, demos and prototypes. It is synthetic by construction, so shipping it as real customer data would be misrepresentation — and every email address in it is deliberately unroutable.

Related tools

JSON formatterPretty-print or minify what you generated.JSON ↔ CSVConvert the rows into the other format.JSON Schema validatorCheck the rows against your schema.