How to convert a JSON to CSV online?

How to convert JSON data into table format online?

I don't know what web service you are using, but I would use the JSON.NET library to deserialize JSON into a collection of classes or into a dictionary if it is already a dictionary. Then iterate through the collection and just output a string for each element.

Here is an example using Newtonsoft.Json.
// Create a list of data that will be converted to a table. List data = new List(). new SomeClass() . };
// Convert data into a table. It is more or less raw json.

String output = JsonConvert.SerializeObject(data); // Parse output to a Dictionary>. Dictionary> dict = JsonConvert.write document.