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What is setDefaultEncoding in Node.js?

Rukhshan Haroon

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The setDefaultEncoding method in Node.js comes with the Stream module and is used to reset the default encoding of a writable stream.

Syntax

stream.setDefaultEncoding(encoding)

Parameters

The setDefaultEncoding function only takes one argument:

  • encoding: a string that denotes the new default encoding

Some of the most widely used encoding(s) supported by Node.js are listed below:

%0 node_1625948397794 ascii node_1625948398502 utf8 node_1625948395009 latin1 node_1625948358739 ucs2 node_1625948337331 hex node_1 base64

Return value

The setDefaultEncoding function returns the current state of the writable stream, which contains details such as its default encoding and length.

Example

The program below creates a writable stream. A string is written to it, and the setDefaultEncoding method is called to change its default encoding from hex to utf8.

To observe this change, the stream’s current default encoding value is filtered out and printed onto the screen using the console.log function.

Alternatively, the entire state of the stream can be printed as well by skipping the filter. The state is returned by the setDefaultEncoding function, or it can be accessed by directly logging the stream onto the console.

const stream = require('stream');
//creating a new writable stream
const mystream = new stream.Writable({
//function to write data to the stream
write: function(data) {
//prints data onto the console
console.log("Data in stream:",data.toString())
}
});
// writes data to stream
mystream.write('Educative');
//changing default encoding of stream to hex
mystream.setDefaultEncoding("hex");
//print default encoding of stream
console.log("Current default encoding:", mystream['_writableState']['defaultEncoding'])
//changing default encoding of stream to hex
mystream.setDefaultEncoding("utf8");
//print new default encoding of stream
console.log("New default encoding:",mystream[ '_writableState']['defaultEncoding'])
//to print the entire state, use the line below:
//console.log(mystream)

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Rukhshan Haroon
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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