Redirect the page to HTTPS if it is in HTTP

Replace an http: address with the same address over https:.

JavaScriptBrowser · DOM Version 1.0.0 · MIT · .md

function redirectToHttps() {
  if (location.protocol !== 'http:') return;
  const url = new URL(location.href);
  url.protocol = 'https:';
  location.replace(url);
}

Usage

redirectToHttps(); // e.g. http://example.com/pricing → https://example.com/pricing

Reviewed, not executed: calling it navigates away from the page.

Know the limits

• A client-side redirect runs after the insecure page has loaded. Redirect at the server or CDN with a 301, and send Strict-Transport-Security so browsers stop requesting HTTP.
• location.replace keeps the HTTP address out of the history, so Back does not loop. A non-default port is kept.

The function above is the code the usage lines run. It does not validate its arguments; add checks where it receives untrusted input.

Keep exploring

• Convert Celsius to Fahrenheit — Apply the temperature conversion without rounding the result.
• Convert hex to RGB — Expand #rgb if needed and read the red, green and blue channels.
• Convert URL parameters to object — Read a query string into an object; repeated keys become arrays.