jc3213 / promisefilereader.js

A JavaScript library providing a Promise-based wrapper for the FileReader API

Usage

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HTML

<script src="https://jc3213.github.io/promisefilereader.js/filereader.js"></script>

TamperMonkey

// @require https://jc3213.github.io/promisefilereader.js/filereader.js

Syntax

let promisedReader = new PromiseFileReader();

Method

• text
• json
• base64
• dataURL
• arrayBuffer
• binaryString

text

let testResult = promisedReader.text(file);

• textResult
  • Promise object, which returns text contents of the file as string if fulfilled

json

let jsonResult = promisedReader.json(file);

• jsonResult
  • Promise object, which returns the contents of the file as a JSON object if fulfilled

dataURL

let dataResult = promisedReader.dataURL(file);

• dataResult
  • Promise object, which returns a data: URL representing the file's content if fulfilled

base64

let base64Result = promisedReader.base64(file);

• base64Result
  • Promise object, which returns base64 encoded string of the file's content if fulfilled

arrayBuffer

let bufferResult = promisedReader.arrayBuffer(file);

• bufferResult
  • Promise object, which returns an ArrayBuffer representing the file's content if fulfilled

binaryString

let binaryResult = promisedReader.binaryString(file);

• binaryResult
  • Promise object, which returns the raw binary string data of the file's content if fulfilled