Which server side language are you using? I assume your file is part of some server deployed web app and you use AJAX to transport the contents to a browser and then capture new information there and want to send an AJAX request to some update method on the server with the new information, which lets the webapp update the file there.
If you want to know how to write a file with node, check this out. If you want to know how to add an element to an array in javascript, that is pretty basic and you could find the information easily in any tutorial page on javascript.
If it's the latter you could rephrase your question, which really has nothing to do with JSON, which is just a way to represent javascript objects as strings. I just can't tell what you're asking. Add a comment. Active Oldest Votes. You have to be clear on what you mean by "JSON".
The client side script On client side you can make a request to the server and then you have to read the response from server. Bharata Bharata ShekharPatel, errors can be traced to configuration of the Web server and security governing access to the content of the Web site. It seems that the server to which you are sending the Post request your Site's server has been configured to block Post request.
You can configure your server to allow the Post request. For more details, go to checkupdown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked 0. See more linked questions. Related Hot Network Questions.
Question feed. If it is your own site, you can embed a Java Applet in the web page. However, the visitor has to install Java on local machine and will be alerted about the security risk. The visitor has to allow the applet to be loaded. An Java Applet is like an executable software that has complete access to the local computer.
Chrome supports a file system which is a sandboxed portion of the local file system. See this page for details. This provides possibly for you to temporarily save things locally. However, this is not supported by other browsers.
If you are not limited to browser, Node. See here for its file system documentation. Note that Node. The javascript test runner Karma is based on Node. If you just like to program in javascript on the local computer, this is an option. Create your directory in the C drive because windows has security against writing from web e. You'll have to turn to Flash, Java or Silverlight. In the case of Silverlight, you'll be looking at Isolated Storage.
That will get you write to files in your own playground on the users disk. It won't let you write outside of your playground though. You can't do this in any cross-browser way.
Writing this answer for people who wants to get a file to download with specific content from javascript. I was struggling with the same thing. Best suited for writing large data generated on client side. Otherwise I suggest using FileSaver. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to read and write into file using JavaScript? Ask Question. Asked 12 years, 10 months ago. Active 1 year, 5 months ago. Viewed k times. Can anybody give some sample code to read and write a file using JavaScript? Improve this question. Sebastian Simon Why do you need it? Maybe there are workarounds. I found this resource regarding client-side file storage.
The browser manages the file storage and imposes certain limits to prevent the World Wide Web from loading peoples hard drives down to the brim. They're not completely fool proof yet, but they're being tweaked, at least according to this article. Have a read for details. Use Ajax and with PHP handle reading and writing files.
If you want to handle writing to files client side, you should forget it. It would require many security options to be disabled on the server and you would be left with an extremely insecure site.
Well, you can! Not through the Internet of course, but internally on your computer, or on your intranet if you have one. How can you use JavaScript to access your local files and folders? Currently there are two ways to do it:. Using a web page and ActiveX objects Internet Explorer only.
Run JavaScript Editor 2. Copy and paste the code below 3. Save the file as FileRead. Note: If you do not save the file, getScriptPath below will return an empty string.
Save the file as FolderExample. Note: if you do not save the file, getCurrentFolder below will return an empty string.
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