Encoding

Background
The 
TextEncoder takes a stream of code points as input and emits a stream of bytes. Encoding types passed to the constructor are ignored and a UTF-8 
TextEncoder is created.
TextEncoder() returns a newly constructed 
TextEncoder that generates a byte stream with UTF-8 encoding. 
TextEncoder takes no parameters and throws no exceptions.
Constructor
let encoder = new TextEncoder();
Properties
encoder.encoding DOMString read-only
The name of the encoder as a string describing the method the 
TextEncoder uses (always 
utf-8).
Methods
encode(inputUSVString) : Uint8Array
Encodes a string input.
TextDecoder
Background
The 
TextDecoder interface represents a UTF-8 decoder. Decoders take a stream of bytes as input and emit a stream of code points.
TextDecoder() returns a newly constructed 
TextDecoder that generates a code-point stream.
Constructor
let decoder = new TextDecoder();
Properties
decoder.encoding DOMString read-only
The name of the decoder that describes the method the 
TextDecoder uses.
decoder.fatal boolean read-only
Indicates if the error mode is fatal.
decoder.ignoreBOM boolean read-only
Indicates if the byte-order marker is ignored.
Methods
decode() : DOMString
Decodes using the method specified in the 
TextDecoder object. Learn more at MDN’s 
TextDecoder documentation.