
![](/api/edpresso/shot/6725583532195840/image/5272130360442880)**`req.query`** is a request object that is populated by request query strings that are found in a URL. These query strings are in key-value form. They start after the #key# question mark :? #key# in any URL. And if there are more than one, they are separated with the #key# ampersand :& #key#. See example below.

#   
#  Example
```
https://educative.io/user?name=Theodore&isAuthor=true
```
From the above code, the query strings are `name` and `isAuthor`. When this request is made, the `req.query` object becomes populated with the query strings.
```
req.query = {name: "Theodore", isAuthor: true}
```

## 
## How to use `expressJs`
1. Create an application and start the server.


var express = require('express');
var app = express();

const PORT = 3000;


app.listen(PORT, ()=>{
  console.log("app running on port "+PORT);
})

app.get("/user", (req, res)=>{
  var name = req.query.name;
  var isAuthor = req.query.isAuthor;
  res.json({
    name,isAuthor
  })
})

3. Open your browser and request the route 
`/user?name=Theodore&isAuthor=true"`.  
This will return a JSON object with the following result.
```
{
   "name": "Theodore",
   "isAuthor": "true"
}
```

Thanks for reading!


![](/api/edpresso/shot/6725583532195840/image/5272130360442880)**`req.query`** is a request object that is populated by request query strings that are found in a URL. These query strings are in key-value form. They start after the #key# question mark :? #key# in any URL. And if there are more than one, they are separated with the #key# ampersand :& #key#. See example below.

#   
<h2>Example</h2>
```
https://educative.io/user?name=Theodore&isAuthor=true
```
From the above code, the query strings are `name` and `isAuthor`. When this request is made, the `req.query` object becomes populated with the query strings.
```
req.query = {name: "Theodore", isAuthor: true}
```

## 
<h3>How to use `expressJs`</h3>
1. Create an application and start the server.


What is req.query in Express.js?

req.query extracts key-value query strings from URLs in Express.js, allowing easy access to request parameters.