How do you implement data validation in MongoDB?

Data validation in MongoDB can be implemented using JSON Schema or custom validation

rules to ensure data consistency.

Example (using JSON Schema):

db.createCollection("products", {

validator: {

$jsonSchema: {

bsonType: "object",

required: ["product_name", "price"],

properties: {

product_name: { bsonType: "string" },

price: { bsonType: "double", minimum: 0 }

});