Random Data is described as 'Generate random data for testing purposes including names, streets, cities, numbers, phone, reversed regular expressions... Free without any registration required!' and is a test data generator in the development category. There are more than 10 alternatives to Random Data, not only websites but also apps for Windows, Linux, SaaS and Mac. The best Random Data alternative is Mock Turtle, which is free. Other great sites and apps similar to Random Data are SQLable, JSONGenerator, dbForge Data Generator for MySQL and DataConstruct.
It's hard to put together a meaningful UI prototype without making real requests to an API. By making real requests, you'll uncover problems with application flow, timing, and API design early, improving the quality of both the user experience and API.
