How to set read concern in MongoDB

Question

I was facing the issue related to setting up of MongoDB can you tell me How to set read concern in MongoDB?

Answer 1

In MongoDB, you can set read concern to control the consistency level of read operations.

1. Setting Read Concern in a Query

db.collection.find({}, { readConcern: { level: "majority" } });

2. Setting Read Concern in MongoDB Driver (Node.js Example)

const collection = db.collection("users");

const result = await collection.find({}).readConcern("majority").toArray();

Read Concern Levels

"local" (default) – Returns the most recent data from the node.

"majority" – Ensures data is committed by a majority of nodes.

"linearizable" – Guarantees the latest committed data across the cluster.

"snapshot" – Provides a snapshot of data (used in transactions).