How to views all documents in a particular collection of database in MongoDB through mongo Shell?

OK, let's start from basics!

After you have connected to mongod with command mongo.

• List databases with command show dbs

iot:PRIMARY> show dbs admin 0.000GB iot 0.020GB local 0.042GB test 0.000GB testi 0.000GB

• Select one of the DB's with use iot command

iot:PRIMARY> use iot

switched to db iot

• List collections on that DB with show collections command

iot:PRIMARY> show collections data header key

• Make query to one of those collections

iot:PRIMARY> db.header.find() { "_id" : "1b5caa", "temp1" : "Temperature", "pressure1" : "Pressure", "humidity1" : "Humidity", "uv1" : "UV", "BusV1" : "Solar Panel (V)", "Current1" : "Solar Panel Current (mA)", "BusV2" : "Battery (V)", "Current2" : "Battery Current (mA)" } { "_id" : "30444", "temp1" : "Temperature", "pressure1" : "Pressure", "humidity1" : "Humidity" } { "_id" : "239684", "temp1" : "Temperature", "pressure1" : "Pressure", "humidity1" : "Humidity" }

So, you need to be connected WANTED database with use command and you need to show the one collection what you want to query with db.<collection_name>.find()

How to see to what database I'm connected currently? Just give command db and you get the answer what is your current DB.

Ref:

https://docs.mongodb.com/manual/tutorial/query-documents/

Select All Documents in a Collection

To select all documents in the collection, pass an empty document as the query filter parameter to the find method. The query filter parameter determines the select criteria:

db.inventory.find( {} )

These operation corresponds to the following SQL statement:

SELECT * FROM inventory