---
description: Takes a stream of code points as input and emits a stream of bytes.
title: Encoding
image: https://developers.cloudflare.com/og-docs.png
---

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# Encoding

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://4f1c5cd2.previews.developers.cloudflare.com/workers/runtime-apis/encoding/index.md)|[Agent setup](https://4f1c5cd2.previews.developers.cloudflare.com/agent-setup/)

## 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() ↗](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder/TextEncoder) returns a newly constructed `TextEncoder` that generates a byte stream with UTF-8 encoding. `TextEncoder` takes no parameters and throws no exceptions.

### Constructor

```js
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() ↗](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder/TextDecoder) returns a newly constructed `TextDecoder` that generates a code-point stream.

### Constructor

```js
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 ↗](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder/decode).

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