Question 161457 in Javascript Question posted in
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Can Javascript connect to mongodb?

I got error "throw new MongooseError(‘Mongoose.prototype.connect() no longer accepts a callback’);"


const mogoURI = "mongodb://localhost:27017/?directConnection=true";

const connectToMongo = ()=>{
    mongoose.connect(mogoURI,()=>{
        console.log("Connected to Mongo Successfully");
    })



}

module.exports = connectToMongo;```
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3

Answers


  1. 0

    what version of mongoose are you using? As the error says the connect method does not take a callback function. The second argument to the function is now an options object you can pass, but now the third parameter is the callback function.

    doc: https://mongoosejs.com/docs/connections.html#callback

    in your case if you just remove that callback it should work, just do:

    mongoose.connect(mogoURI)

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  2. 0

    As the error tells you, the callback is not supported anymore in Mongoose connect() function. Instead, the function returns a promise where you can handle it either for successful or error cases

    mongoose.connect(mogoURI)
  .then(() => console.log("Connected to Mongo Successfully"))
  .catch(error => handleError(error));

    Better way is to use JS await keyword:

    try {
  await mongoose.connect(mogoURI);
  console.log("Connected to Mongo Successfully");
} catch (error) {
  handleError(error);
}
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  3. 0

    If you are using moongoose 5.x and onward, modifying your code in following way should fix it

      const mongoURI = "mongodb://localhost:27017/?directConnection=true";

const connectToMongo = () => {
    mongoose.connect(mongoURI)
        .then(() => {
            console.log('Connected to Mongo Successfully');
        })
        .catch(err => {
            console.error('Failed to connect to Mongo: ' + err);
        });
}

    Also Remember to call your connectToMongo() function somewhere in your code.

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