Express.js req.acceptsCharsets() Function

Last Updated : 07 Jul, 2020

The req.acceptsCharsets() function returns the first accepted charset of the specified character sets on the basis of the request’s Accept-Charset HTTP header field otherwise it returns false if none of the specified charsets is accepted.

Syntax:

req.acceptsCharsets(charset [, ...])

Parameters: The charset parameter is the charset code like ‘UTF-8’, etc.

Return Value: String (if true) or False.

Installation of express module:

You can visit the link to Install express module. You can install this package by using this command.
```
npm install express
```
After installing the express module, you can check your express version in command prompt using the command.
```
npm version express
```
After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
```
node index.js
```

Example 1: Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;
  
app.get('/', function (req, res) {
    console.log(req.get('Accept-Charset'));    
    console.log(req.acceptsCharsets('UTF-8')); 
    res.end();
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

The project structure will look like this:
Make sure you have installed express module using the following command:
```
npm install express
```
Run index.js file using below command:
```
node index.js
```
Output:
```
Server listening on PORT 3000
```
Now make a GET request to http://localhost:3000/ with header set to ‘ Accept-Charset: UTF-8’, then you will see the following output on your console:
```
Server listening on PORT 3000
UTF-8
UTF-8
```

Example 2: Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;
  
app.get('/', function (req, res) {
    console.log(req.get('Accept-Charset'));    
    console.log(req.acceptsCharsets('ISO-8859-1'));
    res.end();
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now make a GET request to http://localhost:3000/ with header set to ‘ Accept-Charset: UTF-8’, then you will see the following output on your console:

Server listening on PORT 3000
UTF-8
false

Reference: https://expressjs.com/en/5x/api.html#req.acceptsCharsets

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