The text() method in the Blob interface returns a Promise that resolves with a string containing the contents of the blob, interpreted as UTF-8.


var textPromise = blob.text();

blob.text().then(text => /* do something with the text */);

var text = await blob.text();




A promise that resolves with a USVString which contains the blob's data as a text string. The data is always presumed to be in UTF-8 format.

Usage notes

The FileReader method readAsText() is an older method that performs a similar function. It works on both Blob and File objects. There are two key differences:

  • Blob.text() returns a promise, whereas FileReader.readAsText() is an event based API.
  • Blob.text() always uses UTF-8 as encoding, while FileReader.readAsText() can use a different encoding depending on the blob's type and a specified encoding name.


Specification Status Comment
File API
The definition of 'Blob.text()' in that specification.
Working Draft

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
text()Chrome Full support 76Edge Full support 79Firefox Full support 69IE No support NoOpera No support NoSafari No support NoWebView Android Full support 76Chrome Android Full support 76Firefox Android No support NoOpera Android Full support 54Safari iOS No support NoSamsung Internet Android Full support 12.0


Full support  
Full support
No support  
No support

See also