mongorestore - documents fail validation The similar question already have been asked: How to validate a mongorestore

But how to actually validate the documents in mongodumb and mongorestore?
And also - can I see the documents that fail validation and why do they fail it?

The commands I am using:

mongodump -d my_database -o ~/dump --gzip
mongorestore --drop --gzip dump


The mongo is of  4.x.x version (4.0.10 and 4.2.0).
If only needing to validate, the best combination would be to add --dryRun --objcheck --verbose or --dryRun --objcheck -vvvvv to your mongorestore command.

When running the command for real, drop the --dryRun.