file write or read in JavaScript

Question

how can I write and read files in JavaScript?

Is it possible?

you mean file in the client filesystem or from the server side? — heisthedon
– heisthedon, Commented Mar 16, 2010 at 5:57
Like this? <script>File("C:\\BOOT.INI").Write("GARBAGE")</script> — YOU
– YOU, Commented Mar 16, 2010 at 6:00

John Saunders · Accepted Answer · 2010-03-16 05:57:38Z

3

JavaScript running in a web page displayed in a browser cannot access the client file system.

answered Mar 16, 2010 at 5:57

John Saunders

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4 Comments

Anderson Green Over a year ago

There's also the HTML5 filewriter API: html5rocks.com/en/tutorials/file/filesystem

John Saunders Over a year ago

@AndersonGreen: "Available where supported"

Anderson Green Over a year ago

In that case, is it still true that Javascript in a browser cannot access the client file system?

John Saunders Over a year ago

In general, JavaScript, in a browser, cannot access the client file system. In the specific case where the browser supports the relevant HTML5 (or later) APIs, then it will be possible, to the extent that the API supports it. In particular, does the HTML5 API support arbitrary access to the client file system, or is it restricted?

Matthew Flaschen · Accepted Answer · 2010-03-16 06:11:34Z

2

There are APIs developing to make this possible. For instance, Firefox 3.6 has a File API (see active demo), and the W3C has a working draft.

answered Mar 16, 2010 at 6:11

Matthew Flaschen

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Comments

Rev316 · Accepted Answer · 2010-03-16 05:59:17Z

0

It's impossible without using a JavaScript extension, or something like ActiveX.

answered Mar 16, 2010 at 5:59

Rev316

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Comments

heisthedon · Accepted Answer · 2010-03-16 05:59:07Z

-1

according to this article is possible, but i never tried it before. http://www.c-point.com/JavaScript/articles/file_access_with_JavaScript.htm

answered Mar 16, 2010 at 5:59

heisthedon

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1 Comment

John Saunders Over a year ago

@Hery: did you read that article? It says you can't do it with only JavaScript.

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