I don't know how about add information to mongodb. Help me
Hello Anh,
What Mongodb node have you tried ?
I used the node-red-node-mongodb (node) - Node-RED set of nodes with success.
(which is the most recently updated)
You just send a msg.payload with the collection Document to a mongodb out node set to

and thats it 
The nodes Help file explains everything in detail.
if you have any problem, share the flow of what you have tried so we can try to help further
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