guid

guid is a required string field used by the sample aggregation system to uniquely identify the sample. It is the author's responsibility to assign a unique guid to their code sample.

You can use https://www.guidgenerator.com to generate a guid. Check the Uppercase and Hyphens boxes and then click on the Generate some GUIDs! button.

The guid field in your sample.json file should have a format similar to the following:

"guid": "01234567-89AB-CDEF-0123-456789ABCDEF"