Error while saving data in MongoDB atlas with mongoose

Question

I'm trying to save data in the MongoDB atlas with node.js and mongoose.

Every time I use MySchema.save(), Data is inserting But I'm also getting the error:

UnhandledPromiseRejectionWarning: MongoWriteConcernError: No write concern mode named 'majority;' found in replica set configuration

Also, there is no duplicate entry, Data is also inserting But I'm also getting the error

let User = require('../models/users.models');

const username = req.body.username;
const newUser = new User({username});
newUser.save()
.then(() => res.json('user added!'))
.catch(err => res.status(400).json('Error: ' + err));

User model

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

var userSchema = new Schema({
    username:  {
        type: String,
        required: true,
        unique: true,
        trim: true,
        minlength: 3
    },
  },
  {
    timestamps: true
  });

const User = mongoose.model('User', userSchema);

module.exports = User;

Answer 1

I know it was asked 2 months ago, but for those who will encounter the same issue. You are mistakenly entering a wrong char at the end of the URI string:
mongodb+srv://${ user }:${ password }@track-mkahl.mongodb.net/test?retryWrites=true&w=majority;
You need to delete the ; after the word majority.

Answer 2

This helped me.

const schema = new Schema({ name: String }, {
  writeConcern: {
    w: 'majority',
    j: true,
    wtimeout: 1000
  }
});

https://mongoosejs.com/docs/guide.html#writeConcern

Answer 3

"mongoURI" : "mongodb+srv://${ user }:${ password }@cluster0.mde0j.mongodb.net/cluster0?retryWrites=true&w=majority "

I get the same error with this in default.json its simple error just delete the &w=majority part at the end and it will be solved

Answer 4

for me it was also in the URI string like @Yossi Saadi has suggested, it's just that I had majoritys written there instead of majority