Steps to reproduce:

1) Open the MongoDB Compass

2) Go to the Databases Tab and Choose DB

2) Under the Collections Tab, Choose Collection

3) Choose the Documents Tab

4) Click Add or Import Data

5) Select a JSON File (Choose JSON Button)

6) Click Import

7) The following message appears: 

 
Import completed with following errors: 0 / 14

• Operation passed in cannot be an Array
  Conclusion: