The JSON Parser node can be used to parse JSON data, either from a local file or from a response from a Web API. The steps are very similar to getting XML data from a web API.
Under the input tab on the Properties, the input could be output from some other node, such as a file access node or Web Run result.
For the output, if you provide a sample file with a JSON response, that is an easy way to get the syntax for the variables coming across in the JSON response. You can click “Set Variable” to see the syntax, and you can select “Export Variables” to get a file with the syntax for all variables in the sample file.
Use this output syntax to set variable values to use later in your flow.