Mongoose find() Function
Last Updated :
10 Feb, 2021
The find() function is used to find particular data from the MongoDB database. It takes 3 arguments and they are query (also known as a condition), query projection (used for mentioning which fields to include or exclude from the query), and the last argument is the general query options (like limit, skip, etc).
Installation of mongoose module:
- You can visit the link to Install mongoose module https://www.npmjs.com/package/mongoose. You can install this package by using this command.
npm install mongoose
- After installing mongoose module, you can check your mongoose version in command prompt using the command.
npm version mongoose
- After that, you can just create a folder and add a file, for example index.js. To run this file you need to run the following command.
node index.js
Filename: index.js
const mongoose = require( 'mongoose' );
useNewUrlParser: true ,
useCreateIndex: true ,
useUnifiedTopology: true
});
const User = mongoose.model( 'User' , {
name: { type: String },
age: { type: Number }
});
User.find({ name: 'Punit' }, function (err, docs) {
if (err){
console.log(err);
}
else {
console.log( "First function call : " , docs);
}
});
User.find({ name: 'Punit'}, {age:0}, function (err, docs) {
if (err){
console.log(err);
}
else {
console.log( "Second function call : " , docs);
}
});
User.find({ age: {$gte:10}}, null , {limit:2}, function (err, docs) {
if (err){
console.log(err);
}
else {
console.log( "Third function call : " , docs);
}
});
|
Steps to run the program:
- The project structure will look like this:
- Make sure you have install mongoose module using following command:
npm install mongoose
- Below is the sample data in the database before the find() function is executed, You can use any GUI tool or terminal to see the database, like we have used Robo3T GUI tool as shown below:
- Run index.js file using below command:
node index.js
So this is how you can use the mongoose find() function in Node.js and MongoDB.
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