Encoding

Last updated Apr 23, 2026

TextEncoder

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

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