How to Efficiently Convert a Blob to a Base64 String in JavaScript?

Converting Blob to Base64

In web applications, images often need to be stored as strings for processing or transmission. Converting a blob, which represents a binary data object, into a base64 string allows for efficient representation and manipulation of images. However, finding the optimal approach to perform this conversion can be challenging.

One common approach is to use the FileReader API. This API provides a method, readAsBinaryString(), that can be used to read the content of a blob as a binary string. However, this method may not be the most efficient option for converting a blob to base64.

Instead, it is recommended to use the readAsDataURL() method. This method reads the content of a blob and encodes it as a data URL. The data URL includes the MIME type of the object, followed by a comma separator, and then the base64-encoded data. To extract the base64-encoded data, simply remove the data:/;base64, prefix from the result.

To convert a blob to a base64 string using readAsDataURL(), follow these steps:

var reader = new FileReader();
reader.onloadend = function() {
  var base64data = reader.result;
  base64data = base64data.replace(/^data:image\/(png|jpeg);base64,/, "");
  console.log(base64data);
};
reader.readAsDataURL(blob);

This approach provides a more efficient and straightforward way to convert a blob to a base64 string.

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