Short answer
What to know
Choose Mockaroo when you need custom fields, generated records, large datasets or configurable mock routes. Choose Payloads when a tiny public fixture, stable URL, cross-format equivalence and no account or API key are more important than customization.
The short comparison
| Need | Payloads | Mockaroo |
|---|---|---|
| Use immediately without an account | Yes | Website generation is available; API access uses a key |
| Design custom fields | No | Yes |
| Generate many records | No; deliberately small | Yes; the free plan allows 1,000 rows per file |
| Stable public fixture URLs | Yes | Saved/generated workflows |
| MessagePack and CBOR fixtures | Yes | Not documented API output formats |
| Programmable mock routes | No | Yes |
Choose Mockaroo for data generation
Mockaroo generates realistic test data from fields you define. The website exports CSV, JSON, SQL and Excel, and the generate API returns JSON, CSV, TXT, SQL, XML or a custom format. Both of its APIs require an API key, and the free plan allows 200 API requests per day. Its mock API feature lets you control the URLs, responses and error conditions.
Choose Payloads for a fixed shared fixture
Payloads requires no setup because there is nothing to configure. The trade-off is that the dataset is fixed. That is useful for examples, regression tests and teams that want to refer to the same small input by URL.