The schema in Mongoose is used to allow you to define the fields stored in each document along with their validation requirements and default values.
they also define document instance methods, static Model methods, compound indexes, and document lifecycle hooks called middleware.
The permitted SchemaTypes are:
<ul>
<li>String
</li>
<li>Number
</li>
<li>Date
</li>
<li>Buffer
</li>
<li>Boolean
</li>
<li>Mixed
</li>
<li>ObjectId
</li>
<li>Array
</li>
<li>Decimal128
</li>
<li>Map
</li>
<li>UUID
</li>
</ul>
<h2 id="heading-creating-schema">Creating Schema</h2>
<pre><code class="lang-javascript">import mongoose from 'mongoose';
const { Schema } = mongoose;

const blogSchema = new Schema({
 title: String, // String is shorthand for {type: String}
 author: String,
 body: String,
 comments: [{ body: String, date: Date }],
 date: { type: Date, default: Date.now },
 hidden: Boolean,
 meta: {
 votes: Number,
 favs: Number
 }
});
</code></pre>
<h2 id="heading-creating-schema-model">Creating schema model</h2>
To use our schema definition, we need to convert our <code>blogSchema</code> into a <a target="_blank" href="https://mongoosejs.com/docs/models.html">Model</a> we can work with. To do so, we pass it to the <code>mongoose.model(modelName, schema)</code>:
<pre><code class="lang-javascript">const Blog = mongoose.model('Blog', blogSchema);
</code></pre>

The schema in Mongoose is used to allow you to define the fields stored in each document along with their **validation** **requirements** and default values.

they also define document instance methods, static Model methods, compound indexes, and document lifecycle hooks called middleware.

The permitted SchemaTypes are:

* String
    
* Number
    
* Date
    
* Buffer
    
* Boolean
    
* Mixed
    
* ObjectId
    
* Array
    
* Decimal128
    
* Map
    
* UUID
    

## Creating Schema

```javascript
import mongoose from 'mongoose';
const { Schema } = mongoose;

const blogSchema = new Schema({
  title: String, // String is shorthand for {type: String}
  author: String,
  body: String,
  comments: [{ body: String, date: Date }],
  date: { type: Date, default: Date.now },
  hidden: Boolean,
  meta: {
    votes: Number,
    favs: Number
  }
});
```

## Creating schema model

To use our schema definition, we need to convert our `blogSchema` into a [Model](https://mongoosejs.com/docs/models.html) we can work with. To do so, we pass it to the `mongoose.model(modelName, schema)`:

```javascript
const Blog = mongoose.model('Blog', blogSchema);
```

Schema in Mongoose

Creating Schema

Creating schema model