Still not clear with your requirement
If your intention is to import data from your primary server to another DB on your local host first create a dump file using mongoexport
Then import into your target DB
Also not clear what you meant by test.json will be created after import
mongoimport will not create any file.It expects a file created by mongoexport which is what we should pass with --file
How are you sure your test.json is a valid file
I was asking the physical size of this file H:\Desktop\Downloads\MongoBD\dumps\test.json not the size from db.stats
Purpose of asking these is to make sure your file is not empty
steevej also asked you to share how test.json was created and command you used to create it
Hope it clarifies your doubts