Print the names of collections with mongoDB and node.js - node.js

Question

im using mongoclient and im sure that I have connection to the database
const client = new MongoClient(uri);
const datatbaseslist = client.db().admin().listDatabases();
datatbaseslist.databases.forEach(db => {
console.log($db.name)
});
I saw that code in a video of the mongodb and its not working.
thanks
I have tried looking for other versions to that line
const datatbaseslist = client.db().admin().listDatabases();
datatbaseslist.databases.forEach(db => {
console.log($db.name)
});
because im pretty sure that the problem is there.

Answer 1

I think your question title is saying one thing (collections) and your code is confusing this any another (databases).
A mongodb server can have multiple databases.
A database can have multiple collections.
You connect to the server using a client.
Normally if you want to know about the databases, you would use admin(). Or to connect to a specific database (although you can connect via URI), the you use db(dbName) from the client.
Once you have a db object, you can get the collections from there.
The below code shows you how to get both databases and collections.
const { MongoClient } = require('mongodb')
async function main () {
// Set config
const uri = 'mongodb://localhost:27017'
const client = new MongoClient(uri)
try {
// Connect to the MongoDB cluster
await client.connect()
// Get databases
const databasesList = await client.db().admin().listDatabases()
for (const dbName of databasesList.databases.map(db => db.name)) {
console.log('DB: ', dbName)
// Get collections for each database
const collections = await client.db(dbName).listCollections().toArray()
console.log('Collections:', collections.map(col => col.name).join(', '))
console.log('---------------------------------------------')
}
} catch (e) {
// Handle any erros
console.error(e)
} finally {
// Always close the connection to the database when finished
await client.close()
}
}
main().catch(console.error)