How to convert string to File object in javascript ?

Question

I am trying to convert string to File object in javascript but I get an error.

my code:

 var contents = fs.readFileSync('./dmv_file_reader.txt').toString()

 var  readerfile1 = new File([""], contents);

(i have to use contents as file and not as string)

and my output is :

ReferenceError: File is not defined
    at d:\Workspace\DMV\dist\win-ia32-unpacked\resources\app.asar\main.js:67:32
    at process._tickCallback (internal/process/next_tick.js:103:7)

any solution some1?

Seems that the File object is not defined... Might have to require something from a module? — Jite
– Jite, Commented Nov 29, 2016 at 15:34
There is no File object in node (assuming this is node since you're using fs). What are you trying to do with the file? — xdumaine
– xdumaine, Commented Nov 29, 2016 at 15:34
Have a look at: stackoverflow.com/questions/8390855/… ; Have you tried using the blob? — user6035379
– user6035379, Commented Nov 29, 2016 at 15:34
In my code i have this line: code reader.readAsArrayBuffer(changeEvent.target.files[0]); code and then i send it to a function that get 'ArrayBuffer'. as i see here this function convert 'File' to 'ArrayBuffer'. therefor i want to convert my 'String' to 'File' and then use this function above. — Tom Cohen
– Tom Cohen, Commented Nov 29, 2016 at 15:44

sachin · Accepted Answer · 2020-02-19 07:13:04Z

18

First you have to create blob from Javascript object and that blob object can be passed to File() constructor to create a File Object.Hope this helps.

 var contents = fs.readFileSync('./dmv_file_reader.txt').toString()
 var blob = new Blob([contents], { type: 'text/plain' });
 var file = new File([blob], "foo.txt", {type: "text/plain"});

answered Feb 19, 2020 at 7:13

sachin

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1 Comment

nda Over a year ago

I think you can go straight to file by just having 'contents' where 'blob' is.

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