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.

Fake data tool

Seamlessly visualize your JSON data instantly into graphs.

Great Expectations is the leading tool for validating, documenting, and profiling your data to maintain quality and improve communication between teams

Generate massive amounts of fake (but realistic) data for testing and development in the browser and node.js

a scalable synthetic data generation platform focused on automated data creation for complex test scenarios.