Node.js Stream writable.setDefaultEncoding() Method
Last Updated :
12 Oct, 2021
The writable.setDefaultEncoding() method is an inbuilt application programming interface of Stream module which is used to set the default encoding for a Writable stream.
Syntax:
writable.setDefaultEncoding( encoding )
Parameters: This method accepts single parameter encoding which holds the encoding to be used for the Writable stream.
Return Value: It returns the encoding which is made by default.
Below examples illustrate the use of writable.setDefaultEncoding() method in Node.js:
Example 1:
const stream = require( 'stream' );
const writable = new stream.Writable({
write: function (chunk, encoding, next) {
console.log(chunk.toString());
next();
}
});
writable.write( 'hi' );
writable.setDefaultEncoding( "utf8" );
|
Output:
hi
Writable {
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: true,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 1,
prefinished: false,
errorEmitted: false,
emitClose: true,
autoDestroy: false,
bufferedRequestCount: 0,
corkedRequestsFree:
{ next: null,
entry: null,
finish: [Function: bound onCorkedFinish] } },
writable: true,
_write: [Function: write],
domain: null,
_events: [Object: null prototype] {},
_eventsCount: 0,
_maxListeners: undefined }
Here, the default value is returned in the output.
Example 2:
const stream = require( 'stream' );
const writable = new stream.Writable({
write: function (chunk, encoding, next) {
console.log(chunk.toString());
next();
}
});
writable.write( 'hi' );
writable.setDefaultEncoding( "ascii" );
|
Output:
hi
Writable {
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false, ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: true,
defaultEncoding: 'ascii',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 1,
prefinished: false,
errorEmitted: false,
emitClose: true,
autoDestroy: false,
bufferedRequestCount: 0,
corkedRequestsFree:
{ next: null,
entry: null,
finish: [Function: bound onCorkedFinish] } },
writable: true,
_write: [Function: write],
domain: null,
_events: [Object: null prototype] {},
_eventsCount: 0,
_maxListeners: undefined }
Here, the default value is “ascii”.
Reference: https://nodejs.org/api/stream.html#stream_writable_setdefaultencoding_encoding
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