Mongoose READ

Mongoose READ

As a web developer, I have worked with MongoDB and Mongoose, a popular Object Data Modeling (ODM) library for MongoDB. Mongoose provides easy-to-use methods to perform CRUD operations on MongoDB documents. In this post, I will explain how to perform a read operation using Mongoose.

What is Mongoose READ?

Mongoose READ operation is used to retrieve data from MongoDB collections. In other words, it is used to fetch records/documents from the database.

Mongoose provides two methods to perform READ operations:

• findOne
• find

findOne Method

The findOne method is used to retrieve a single document that matches the specified query criteria. It takes one parameter, which is an object containing the query criteria.

const User = require('./models/user');

User.findOne({ username: 'johndoe' }, (err, user) => {
  if (err) {
    console.log(err);
    return;
  }
  console.log(user);
});

find Method

The find method is used to retrieve multiple documents that match the specified query criteria. It takes one parameter, which is an object containing the query criteria.

const User = require('./models/user');

User.find({ age: { $gte: 18 } }, (err, users) => {
  if (err) {
    console.log(err);
    return;
  }
  console.log(users);
});

The above code will retrieve all users whose age is greater than or equal to 18.

Conclusion

Mongoose provides easy-to-use methods to perform READ operations on MongoDB documents. The findOne method is used to retrieve a single document and the find method is used to retrieve multiple documents.