Generate fake data to JSON, CSV, TXT, SQL and XML.
Mockaroo API is a free Test Data API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
A free test data generator and API mocking tool - Mockaroo lets you create custom CSV, JSON, SQL, and Excel datasets to test and demo your software.
Details from mockaroo.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Zero-auth REST endpoints for mock user profiles, UUIDs and HTTP status codes
API mocking tool to generate contextual, fake or random data
The "lorem ipsum" generator that doesn't suck
Random data generator
The Mockaroo API is provided by Mockaroo (mockaroo.com). A free test data generator and API mocking tool - Mockaroo lets you create custom CSV, JSON, SQL, and Excel datasets to test and demo your software.
Yes. The Mockaroo API is listed in the Test Data category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Mockaroo API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Mockaroo API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Mockaroo API is served over HTTPS, so it's safe to use in production.