How to get HTTP user-agent header with js?

Question

For my project, I want to get and print the user-agent of my browser. I'm using javascript (with node) to accomplish my goal. How can I get and print the user-agent header without using the HTTP module and html if possible and inside of this blank function:

function userAgent() {
  
}

Do you want to know what kind of browser users are accessing? — Minwoo Kim
– Minwoo Kim, Commented Jul 29, 2020 at 7:03

Sebastian Kaczmarek · Accepted Answer · 2020-07-29 06:59:58Z

5

Just use window.navigator.userAgent

function userAgent() {
  return window.navigator.userAgent;
}

console.log(userAgent());

answered Jul 29, 2020 at 6:59

Sebastian Kaczmarek

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5 Comments

Sergio Ley Over a year ago

I get this error: ` return window.navigator.userAgent;` ^ ReferenceError: window is not defined I should clarify that I also don't want to use html for this

Sebastian Kaczmarek Over a year ago

How do you run this code? Are you using Node maybe?

Sergio Ley Over a year ago

I am using node

Sebastian Kaczmarek Over a year ago

Well, then you should definitely clarify that in the question because that changes like everything. You cannot get a user agent in the Node app itself because UA is something tightly connected with a client app. You could do that if you had for example some frontend app that makes a request to your Node server - then you can get the UA header from the request.

Minwoo Kim Over a year ago

You have reference this article stackoverflow.com/questions/6163350/…

Minwoo Kim · Accepted Answer · 2020-07-29 07:11:50Z

1

You can try this.

<script>
   window.onload = function () {
        var agent = navigator.userAgent.toLowerCase();
        if (agent.indexOf('chrome') != -1) { 
           alert('Chrome');
        }
        if (agent.indexOf('msie') != -1) {
           alert('Explorer');
        }
        if (agent.indexOf('safari') != -1) {
           alert('Safari');
        }
        if (agent.indexOf('firefox') != -1) {
           alert('Firefox');
        }
   }
</script>

answered Jul 29, 2020 at 7:11

Minwoo Kim

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