Atomic Transactions in MongoDB With NodeJS

Atomic Transactions are very useful when one has to perform a indivisible and irreducible series of database operations, and with mongoDB the multi document atomic transactions were introduced in the version 4.0. While MongoDb is wiidely used along with NodeJS, I thought it would be helpful to have an example of performing atomic transactions in mongodb with nodejs.

MongoDB atomic transactions with NodeJS

var mongoose = require('mongoose');

async () => {
    const session = await mongoose.startSession();
    await session.startTransaction();
    try {
        const opts = { session, new: true };
        // perform operations
     } catch (error) {
        await session.abortTransaction();
        await session.endSession();
        throw error;
    }
}

Important things to remember:

• Every transaction has a session associated with it
• At a given time, at most only one open transaction for a session.
• If a session ends and it has an open transaction, the transaction aborts.