faker.js
Generate massive amounts of fake (but realistic) data for testing and development in the browser and node.js
Similar Tools
The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.
AutoTestData is a single page web application to generate the Fake Test Data just in 3 simple steps. It is an absolutely free community product.
Go beyond basic mocking and stubbing to create a more robust simulation for APIs and services.