Dummy JSON and CSV test-data generator

Create small dummy records for tests and examples. Values come only from your chosen labels and options; no real people or external data are sourced.

Input

Number of rows

A whole number from 1 to 1,000. Output is limited to 1,000,000 characters.

Output format

Label prefix (optional)

Leave blank for item. One line, maximum 100 UTF-16 characters; labels append -0001, -0002 and so on.

Choice values (optional)

One nonblank choice per line. Leave blank for alpha and beta. Maximum 100 choices, 200 characters each and 10,000 characters in total.

Include dummy UUID-shaped ID

These identifiers are test fixtures, not credentials, password material or a cryptographic identifier service.

Reproducible seed (optional)

Exact text, maximum 256 UTF-16 characters. A seed reproduces all generated fields and must not be a secret. Leave blank to use browser cryptographic random bytes.

Output

Ready. Nothing is saved automatically.

How to use this tool

Enter 1 to 1,000 rows and choose JSON or CSV. Optionally supply a label prefix and one choice per line.
Leave the seed blank for browser random bytes, or enter a nonsecret seed to reproduce a fixture. The optional UUID-shaped value is explicitly dummy test data.
Select Generate dummy records. Review any CSV safety warning, then copy or download the result.

Scope and limits

Only sequence, label, choice, boolean and optional dummy UUID-shaped fields are generated. No real personal information, network source, custom executable template, credential or password generation is provided. The seeded FNV-1a/Mulberry32 generator is deterministic and not cryptographically secure.

Maximum 1,000 records, 100 choices, 200 UTF-16 characters per choice, 100 per prefix, 256 per seed and 1,000,000 output characters. Empty prefix/choices use the documented defaults; blank lines inside a supplied choice list are rejected.

CSV quotes every cell and prefixes a single apostrophe to formula-risk text, including formula markers after leading whitespace and leading tab/control characters. The result reports how many cells changed. JSON retains original text. Spreadsheet interpretation varies: inspect imports and do not remove the safety prefix without review.

Processing runs locally and this tool does not upload or autosave source text. This site can load consent-controlled third-party services, so use dummy, nonsensitive input only. Password and authentication tools remain subject to separate verified ad-free-hosting requirements.

Inputs start empty. Load example fills them only when you choose it. Reset clears every text field and output. Cancel stops the worker and keeps your input.

Processing runs locally. This tool does not upload or autosave your input. The site can load consent-controlled third-party services; use nonsensitive test input and keep passwords, tokens and personal records out of these fields.

Worked example

Input and settings

Rows: 2
Format: JSON
Label prefix: item
Choices: alpha and beta
Seed: demo
Dummy UUID-shaped ID: off

Result

[
  {
    "sequence": 1,
    "label": "item-0001",
    "choice": "alpha",
    "boolean": true
  },
  {
    "sequence": 2,
    "label": "item-0002",
    "choice": "alpha",
    "boolean": true
  }
]

Load example to reproduce this complete dummy fixture. Changing JSON to CSV preserves the generated values except for explicitly reported spreadsheet-safety prefixes.