📄 threejs/Core/Loaders/FileLoader

File: FileLoader.md | Updated: 11/15/2025


title: FileLoader category: Core layout: docs

FileLoader

A low level class for loading resources with the Fetch API, used internally by most loaders. It can also be used directly to load any file type that does not have a loader.

This loader supports caching. If you want to use it, add THREE.Cache.enabled = true; once to your application.

Code Example

const loader = new THREE.FileLoader();
const data = await loader.loadAsync( 'example.txt' );

Constructor

new FileLoader( manager : LoadingManager )

Constructs a new file loader.

manager | The loading manager.
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Properties

.mimeType : string

The expected mime type. Valid values can be found here

.responseType : 'arraybuffer' | 'blob' | 'document' | 'json' | ''

The expected response type.

Default is ''.

Methods

.abort() : FileLoader

Aborts ongoing fetch requests.

Overrides: Loader#abort

Returns: A reference to this instance.

.load( url : string, onLoad : function, onProgress : onProgressCallback, onError : onErrorCallback ) : any | undefined

Starts loading from the given URL and pass the loaded response to the onLoad() callback.

url | The path/URL of the file to be loaded. This can also be a data URI.
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onLoad | Executed when the loading process has been finished.
onProgress | Executed while the loading is in progress.
onError | Executed when errors occur.

Overrides: Loader#load

Returns: The cached resource if available.

.setMimeType( value : string ) : FileLoader

Sets the expected mime type of the loaded file.

value | The mime type.
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Returns: A reference to this file loader.

.setResponseType( value : 'arraybuffer' | 'blob' | 'document' | 'json' | '' ) : FileLoader

Sets the expected response type.

value | The response type.
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Returns: A reference to this file loader.

Source

src/loaders/FileLoader.js