How to read GET data from a URL using JavaScript?

Please see this, more current solution before using a custom parsing function like below, or a 3rd party library.

The a code below works and is still useful in situations where URLSearchParams is not available, but it was written in a time when there was no native solution available in JavaScript. In modern browsers or Node.js, prefer to use the built-in functionality.

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function parseURLParams(url) {
    var queryStart = url.indexOf("?") + 1,
        queryEnd   = url.indexOf("#") + 1 || url.length + 1,
        query = url.slice(queryStart, queryEnd - 1),
        pairs = query.replace(/\+/g, " ").split("&"),
        parms = {}, i, n, v, nv;

    if (query === url || query === "") return;

    for (i = 0; i < pairs.length; i++) {
        nv = pairs[i].split("=", 2);
        n = decodeURIComponent(nv[0]);
        v = decodeURIComponent(nv[1]);

        if (!parms.hasOwnProperty(n)) parms[n] = [];
        parms[n].push(nv.length === 2 ? v : null);
    }
    return parms;
}

Use as follows:

var urlString = "http://www.example.com/bar?a=a+a&b%20b=b&c=1&c=2&d#hash";
    urlParams = parseURLParams(urlString);

which returns a an object like this:

{
  "a"  : ["a a"],     /* param values are always returned as arrays */
  "b b": ["b"],       /* param names can have special chars as well */
  "c"  : ["1", "2"]   /* an URL param can occur multiple times!     */
  "d"  : [null]       /* parameters without values are set to null  */ 
} 

So

parseURLParams("www.mints.com?name=something")

gives

{name: ["something"]}

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EDIT: The original version of this answer used a regex-based approach to URL-parsing. It used a shorter function, but the approach was flawed and I replaced it with a proper parser.

try this way

var url_string = window.location;
var url = new URL(url_string);
var name = url.searchParams.get("name");
var tvid = url.searchParams.get("id");

It’s 2019 and there is no need for any hand-written solution or third-party library. If you want to parse the URL of current page in browser:

# running on https://www.example.com?name=n1&name=n2
let params = new URLSearchParams(location.search);
params.get('name') # => "n1"
params.getAll('name') # => ["n1", "n2"]

If you want to parse a random URL, either in browser or in Node.js:

let url = 'https://www.example.com?name=n1&name=n2';
let params = (new URL(url)).searchParams;
params.get('name') # => "n1"
params.getAll('name') # => ["n1", "n2"]

It’s making use of the URLSearchParams interface that comes with modern browsers.

I think this should also work:

function $_GET(q,s) {
    s = (s) ? s : window.location.search;
    var re = new RegExp('&'+q+'=([^&]*)','i');
    return (s=s.replace(/^\?/,'&').match(re)) ?s=s[1] :s='';
}

Just call it like this:

var value = $_GET('myvariable');