DataConstruct is described as 'Writing test data and then writing out the code to consume it is a tedious process. Especially if you need it across multiple programming languages and database(s). What if you could easily define what your schema should look like, and get your data, code, and SQL automatically' and is an app. There are more than 10 alternatives to DataConstruct for Web-based, Windows, Linux, SaaS and Mac. The best DataConstruct alternative is Mock Turtle, which is free. Other great apps like DataConstruct are JSONGenerator, Random Data, dbForge Data Generator for MySQL and MockBlast.
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.
