The answer
Create a new schema with new mongoose.Schema({ field: type }). For example, const userSchema = new mongoose.Schema({ name: { type: String, required: true }, email: { type: String, unique: true }, age: Number }).
Mongoose Schemas and Models Explained for Node.js
How do I define a Mongoose schema?
More FAQs in Mongoose Schemas and Models Explained for Node.js
A schema defines the structure, types, and validation of documents. A model is compiled from a schema and provides CRUD methods to interact with documents. The schema is the blueprint; the model is the tool.
Use mongoose.model('ModelName', schema). For example, const User = mongoose.model('User', userSchema). The model name maps to a collection (User becomes 'users'), and you use the model for all CRUD operations.
Required fields, min/max values, match patterns, enum values, and custom validators. Mongoose runs these before saving, so invalid data never reaches the database, preventing data integrity issues.
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