How to add unique constraint in collection of MongoDB using Node.js?
Mongoose module is one of the most powerful external modules of the node.js.Mongoose is a MongoDB ODM i.e (Object database Modelling) that used to translate the code and its representation from MongoDB to the Node.js server. Mongoose module provides several functions in order to manipulate the documents of the collection of the MongoDB database.
Unique constraint: We can add a unique constraint on the value of the document collection in MongoDB so that all the documents can be distinguished easily. A unique constraint is added during the creation of the structure of the collection in Node.js
npm install mongoose
Running the server on Local IP: Data is the directory where the MongoDB server is present.
mongod --dbpath=data --bind_ip 127.0.0.1
Run index.js file using below command:
Output: Record already present in the collection(Console).