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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: 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: 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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