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Node.js readStream.isRaw Property

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  • Last Updated : 26 Aug, 2020
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The readStream.isRaw property is an inbuilt application programming interface of class ReadStream within tty module which is used to check if the read stream object is currently configured to operate as a raw device or not.

Syntax:

const status = ReadStream.isRaw;

Return Value: This property returns true if and only if the read stream object is currently configured to operate as a raw device.

Example 1: Filename: index.js




// Node.js program to demonstrate the
// readStream.isRaw property
  
// Importing dgram module
var dgram = require('dgram');
  
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
  
// Catching the message event
server.on("message", function (msg) {
  
    // Creating and initializing a
    // ReadStream object
    let ReadStream = process.stdin;
  
    // Checking if it is configured or
    // not by using isRaw() method
    const status = ReadStream.isRaw;
  
    // Displaying the result
    if (status) {
        process.stdout.write(msg 
            + "configured" + "\n");
    } else {
        process.stdout.write(msg 
            + "not configured" + "\n");
    }
  
    // Exiting process
    process.exit();
})
  
// Binding server with port
.bind(1234, () => {
});
  
// Client sending message to server
client.send("It is ", 0, 7, 1234, "localhost");


Output:

It is not configured

Example 2: Filename: index.js




// Node.js program to demonstrate the
// readStream.isRaw property
  
// Creating and initializing a 
// ReadStream object
let ReadStream = process.stdin;
  
// Setting the read stream Raw mode
// by using setRawMode() method
ReadStream.setRawMode(true);
  
// Checking if it is configured or not 
// by using isRaw() method
const status = ReadStream.isRaw;
  
// Displaying the result
if(status) {
   console.log("It is configured");
} else {
   console.log("it is not configured");
}


Run the index.js file using the following command:

node index.js

Output:

It is configured

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tty.html#tty_readstream_israw


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