#    
#    
**`exists`** is a Mongoose method or function that is used to check if at least one document exists that matches a specified filter. If there is a match, `true` is returned. Otherwise, `false` is returned. 


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#  Syntax

```js
Model.exits(filter)
```

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## Parameter
**`filter`**: The specified filter. It is an object that contains a path or paths with a specified value to match the documents.

##   
## Return value
A Boolean value is returned, which is either `true` or `false`. `true` is returned when at least one document that matches the filter exists in the collection. Otherwise, `false` is returned.

##   
## Code
In the example below, we  demonstrate the use of the `exists()` method. We create a product Schema and check if a certain product exists in the collection using the `exists()` method. 

// import mongoose
const mongoose = require("mongoose");

// creating a product Schema with mongoose
let Product = mongoose.model("Item", new mongoose.Schema({
    name: String,
    category: Number,
    price: Number,
    tag: String
  })
)

// check if product Educative.io
// exists with the exists() method
let product = await Product.exists({name: "Educative.io"}); 

console.log(product)   // true

If `product` from the code above is logged to the console, a `true` value is returned because `Educative.io` is a product that exists in the collection.

What is exists() in Mongoose?

Mongoose's `exists()` method checks if any document matches a specified filter, returning true or false.