Click the ... icon next to the collection and select Export under More.
3.
Choose Collection v2.1 (Recommended) and save the JSON file.
Batch Exporting Multiple Collections
You can batch export multiple Postman collections using the steps below:
Click your account avatar in the top-right corner of Postman and select Settings.
Under Account Settings, click Export Data.
Create a new export request and select Collections and Environments as needed.
Download the export file from the email Postman sends you.
Importing these collections is straightforward. Extract the folders from the zip file you received, then follow the same procedure described below to import your collections.
Once imported, check that your variables are correctly mapped. You can then select the imported environment (or create a new one, if you didn't import) and make requests.