How to export all collections in MongoDB?

Question

I want to export all collections in MongoDB by the command:

mongoexport -d dbname -o Mongo.json

The result is:
No collection specifie

Answer 1

1. Open the Connection
2. Start the server
3. open new Command prompt

Export:

mongo/bin> mongoexport -d webmitta -c domain -o domain-k.json

Import:

mongoimport -d dbname -c newCollecionname --file domain-k.json

Where

webmitta(db name)
domain(Collection Name)
domain-k.json(output file name)