Fake Data Generator

Generate realistic fake data for testing — names, emails, addresses, and more.

Fake Data Generator produces realistic test fixtures across ten data types — Full Names, Email Addresses, Phone Numbers, Street Addresses, Credit Card Numbers, UUID v4, Random Dates (ISO), Secure Passwords, Random Numbers, and Hex Colors — without any faker.js dependency. Pick a type, set Count on a 1–1000 slider (Random Numbers also expose Min/Max), and "Generate {Type}" fills a scrollable results table you can Copy All, export as JSON, or export as CSV.

Generation is driven by an in-repo mulberry32 PRNG seeded with Date.now(), so sequences are reproducible within a page session. Emails combine first/last name lists with separators and digits; phones cycle four US-style formats; addresses assemble number + street + city + state + zip; credit cards use brand prefixes (Visa 4, MC 5, Amex 37, Discover 6) with a simple checksum digit for test data only. Everything runs locally — no network.

How it works

lib/fakeData.ts seeds mulberry32 with Date.now() and exposes one generator per DATA_TYPE label. Names pick from first×last lists; emails are name + separator + optional digits at a domain-list address; phones choose among us/dots/paren/intl formats; addresses join num + street + city + state + zip; credit cards pick a brand prefix, fill digits, and append a Luhn-ish checksum digit grouped by 4s; dates stay within 2000–2024, month 1–12, day 1–28 (ISO); passwords are 12–21 chars from alnum+symbols; numbers span min–max; colors emit #rrggbb.

Results land in fakeDataSlice (dataType/count/results). CSV export writes an index,value header with quote escaping; JSON export is a plain array. The "Generate {Type}" button toasts "Generated {n} {type-lowercased}". No network calls — word lists and the PRNG live entirely in the bundle.

How to use

Step "Configure" — pick Data Type from the select (ten options from "Full Names" to "Hex Colors").
Set Count on the slider (1–1000; ticks at 1, 500, 1000).
If type is "Random Numbers", set Min and Max (defaults 0/1000).
Click "Generate {Type}" (toast "Generated {n} {type}").
Browse the results table (# / Value, sticky header, scrollable to max-h-80) under "{n} results generated".
"Copy All" (newline-joined) → toast "Copied to clipboard!".
Download "JSON" (fake-{type}-{count}.json) or "CSV" (fake-{type}-{count}.csv).
"Clear Results" resets the list and step indicator.

Tips

Credit cards use brand prefixes + a simple checksum digit — test data only, never real PANs.
Phone numbers cycle four US-style formats for realistic variety in fixtures.
Dates stay ≤ day 28 to avoid invalid month/day combos across generated ranges.
mulberry32 seeded from Date.now() gives stable sequences within a page session — regenerate without changing the seed for the same stream.
CSV export always includes the index,value header, so it drops straight into spreadsheets.