Json Generator
A tool used by the developers for generating random data
Screenshots

Hunter's comment
Developers are used to work with Json data and when it comes to dummy data for testing, they will require lots of data to test out their application. Json Generator tool is an awesome tool that helps in providing dummy data for the users. For someone who is using a MongoDB, this tool is awesome because you can prepare the metadata in the left column and generate data in the right column.
While preparing the data, there is also an option available to specify how many values you will need. The first line of the code specifies "repeat" option where you can choose how many comma seperated json values you will need. While working with MongoDB. All you have to do is to bulk import this data into your database structure. There is a shell command called db.collections.insertmany() available in Mongo DB to insert buld data into your mongo database.
Earlier the developers used to insert data manually inside a database to do their testing. This can even be used for API testing as well.
Link
https://www.json-generator.com/

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