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.