When you export a contact, you download a zip file containing two files:
a CSV file containing the contact's information
a JSON file of their chat history.
Export a contact and their chat history
On the chat interface, select the chat session of the contact you want to export – this opens the chat window.
Select the Contact actions drop-down menu in the right column of the chat window.
Select Export contact, and wait on the Exports page until the status changes to Finished.
Select Download — a zip file downloads to your local machine containing two files:
the contact's information in CSV
their message history in JSON.
Unzip the file to access either of the files.