Answer / Sah Navneet Kumar Ramsuraj

In Mongoose, you can set a primary key by defining the schema's `_id` field and setting its type to your desired data type. For example, for a user model with an auto-incrementing primary key:
const mongoose = require('mongoose');
const { Schema } = mongoose;
const UserSchema = new Schema({ _id: {type: Number, unique: true, autoIncrement: true}});

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