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const url = require('url');
const x = 'http:/a.com/a/b/c/d/e.json?x=1&y=2';
const y = '../../../';
console.log(url.resolve(x, y));

use URI;
my $x = 'http:/a.com/a/b/c/d/e.json?x=1&y=2';
...
print $u;
<c>
<p>With this result: <c>http:/a.com/a/b/c/d/e.json/../../../?x=1&y=2