How to save ArrayBuffer?

Question

How to save an ArrayBuffer in json file? I use electron-config for this, but in config.json I found \"{}\". I try convert (code) ArrayBuffer to string, but then I can\'t con

Answer 1

There are no ArrayBuffers in the JSON format (only strings, numbers, booleans, null, objects and arrays) so if you want to save an ArrayBuffer in JSON then you'll have to represent it in one of those types (probably a string or an array of numbers).

Then when you read the JSON you will have to convert it back into an ArrayBuffer, reversing the transformation that you did before.

Answer 2

Working Snippet Node 14.xx+

Create a output directory

  let rootDir = process.cwd()
  console.log("Current Directory"+ rootDir)

  let outDir = './out/';
  console.log("Out Directory"+ outDir)

  if (!fs.existsSync(outDir)){
      fs.mkdirSync(outDir);
  }else{
      console.log("Directory already exist");
  }
   
  // Save the raw file for each asset to the current working directory
  saveArrayAsFile(arrayBuffer,  outDir+ "fileName"+ new Date().getTime()+".png")

Save file function

const saveArrayAsFile =  (arrayBuffer, filePath)=> {
      fs.writeFile(filePath, Buffer.from(arrayBuffer), 'binary',  (err)=> {
          if (err) {
              console.log("There was an error writing the image")
          }
          else {
              console.log("Written File :" + filePath)
          }
      });
};

Answer 3

For saving to disk, you should be able to use the normal node APIs for writing something to disk. For example:

require('fs').writeFileSync('/path/to/saved/file', Buffer.from(myArrayBuffer));