In my angular projects, I use the faker.js library to generate fake data for the test fixture factories used by my unit tests and the dev application running with a stubbed back-end. It is a convenient and consistent way to generate data that looks real and makes the code of our fixtures really simple. The Faker.js API documentation is really basic and sometimes it not obvious what kind of values it can generate.
To help with that you can use the next demo page https://cdn.rawgit.com/Marak/faker.js/master/examples/browser/index.html that shows examples of generated data for each of the faker.js API methods.
I encourage to use it and get familiar with the faker API to improve the quality of our test data.