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Javascript Check whatever link is download link or webpage link

It there anyway to check link whatever is a download link like http://ipv4.download.thinkbroadband.com/5MB.zip
or normal web like open https://www.google.com
Currently I am using Electron and want to check if link is download link it will download and not open new browser but if not it will open in browser window

Make an HTTP request and check the Content-Type and (if it is there) Content-Disposition headers.
If Content-Disposition says it is an attachment, then it is a download. If it says it is inline, then it is intended to be displayed in the browser window.
If Content-Disposition isn't specified, then you'll need to make the decision based on the MIME type. e.g. text/html should probably be shown in the browser window.

May be check the end of the link... if it ends with .zip .jpg .pdf .... it is a file.
Or .html ... it is a page.

Change file name when using window.location to download

I'm using window.location to download my image. It isn't in HTML because I generate the image on the server and then send it back down so it looks like :
window.location = data.url;
I've seen a few other questions but they suggest the download attr which I don't have because there's no HTML.
Is there a way I can change the file name?

Front-end solution
The only thing you can do on the front-end side is to change your code to HTML <a> element with download attribute:
Download
When user clicks this link, the browser forces download and saves the file with given filename. You can read more about it in this post. It's quite a new feature so check the browser support.
Back-end solution
If you can modify the server-side code then you should use content-disposition header as defined in RFC 2183.
content-disposition: attachment; filename=very_important_report.pdf

I've been wondering about it as well and saw this post but I was also using vuejs for the project and want the export to be continues even when switching from one page to another so I tried something and it did work here is another solution:
var link = document.createElement('a');
link.setAttribute('href', '<yourlink_or_data>');
link.setAttribute('download', 'filename.ext');
link.click();

You can't change the filename on the client side. You would have to do that on the server.
You could set the content-disposition header (on the server side) like this:
Content-Disposition: attachment; filename="yourname.gif"

Set name of the download file even if download link redirect to another

I have a page http://example.com/1.html and on it I have a link http://example.com/1.mp4
Download
which redirect to another link https://example.com/videoplayback?....
which plays the .mp4 file. In order to download the file without redirect I use the download attribute
<a href="http://example.com/1.mp4" download>Download</a>
and in order to set a name to the file I set a value to the download attribute
Download
Now when I click the link the file should start downloading with the name S1E1.mp4 but because the link redirect to another link the file name is "videoplayback".
So how can I set the name of this file to be "S1E1.mp4".
Thanks for everything. If my question is not clear leave a comment and I'll edit it.

The real Question is: Why do you redirect? I guess you're using htaccess? Then use a normal rewrite, not a redirect.
Edit:
Your PHP-Script should at least provide a Filename per header:
header('Content-type: -whatever type this is-');
header('Content-Disposition: attachment; filename="My-Super-Video.mp4"');

Need to download a file from webpage to local drive

I has a requirement like when user clicks on a download button instead of showing the content in browser, i want to save it to the localdisk(perticular location) of the user desktop. Is it possible to do??
If yes,Please help me with possibilities..
Thanks in advance

No a website can't decide where it can save something. Everything goes to download folder by default. You have to be using some sort of plugin with permissions or make like browser addon/extension.
If you want to prompt download then you could set send headers in php:
Content-Disposition: attachment; filename="fname.ext"
and
Content-Type: application/force-download
Or you could set attribute download to link in html
<a href="file.abc" download>Click Me</a>
Utility of HTTP header "Content-Type: application/force-download" for mobile?
http://en.wikipedia.org/wiki/List_of_HTTP_header_fields
http://www.php.net/manual/en/function.header.php
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#Attributes

You shall just point the file name like this to download.
But you cannot decide the path by your code.
Download the File
Note : Do not try this in jsfiddle or in codepen because they will rename the link with their custom so that the file will be displayed within their output. So, try it in your web server or in your localhost.

Standard way of doing a "thanks_for_downloading.html" + "Save file..." after a link?

Let's look at FireFox.
They have a nice big Call To Action button: "Firefox 3.6 - Free Download"
You click that, it links you to a new page: "Thanks for downloading Firefox! Your download should begin in a few seconds."
Then a few seconds later up pops: "FIREFOX.exe - Do you want to save or discard this file?"
This is pretty standard download behavior for applications accross the web. How is it done, in the simplest way?

There are two parts to this:
Forcing the browser to download the file, rather than trying to display it (with .exe that's no problem, but you might want to do it with an image, movie, or HTML file too).
Prompting the browser to download the file.
Let's pretend we just want the browser to download a file, without wanting to change the page. We can create a link like this, and it'll work as expected:
Download File
Your browser probably doesn't know how to handle a zip file, so it downloads "download.zip" straight to a file named after the filename in the URL. If you wanted to download a JPG instead, though, this wouldn't work:
Save this Sunset!
Your browser knows how to display a JPEG, so it redirects the page and shows the JPEG. Now we need to tell the browser not to show it, but to download it instead. To do that, we have to send it some specific HTTP headers in the response from the server.
Apache can handle this by specifying headers in .htaccess, but I'll stay away from a particular technology, opting to just talk about the mechanism.
So we send the following header to the browser along with the image:
Content-disposition: attachment; filename=the_sunset_of_a_lifetime.jpg;
The first header, content-disposition, tells your browser that we want the file to be an attachment, or in other words, it should be saved, not displayed. The filename attribute tells it the name to use to save the file (rather than "sunset.jpg", the file will be named "the_sunset_of_a_lifetime.jpg").
Now the link to download the "sunset.jpg" file works like we want. But how do we get the browser to download it without the user clicking on the link so we can show a "Thank You" page and prompt the download to start? A simple <meta> tag can do the trick, telling the browser to redirect the page after a set period of time:
<meta http-equiv="refresh" content="2;url=/images/sunset.jpg">
When your "thank you" page loads with that meta tag in the head, it'll wait for 2 seconds and then try to load the image. It'll get the headers we set in the last step, and download it instead of displaying it, and the user will stay put on the page like we want.

Example content of thanks_for_downloading.html:
<strong>Thanks for downloading XY</strong>
<script type="text/javascript">
window.onload = function(){
window.location.href = "path/to/XY.exe";
};
</script>
The Download-link is just a link to the thanks_for_downloading.html page

The call to action button is a regular link to the "Thank you" page. Then on the "Thank you" page, use javascript to redirect the user to the file you are downloading by setting the "window.location" property to the file's URL.