I think you should try first, but let me give some snippet code to give idea.
You need to use replace().
I am giving you about two cases, this is just to make understanding.
If you want to convert the current url, then you should use “window.location.href” to take current url,
window.location = window.location.href.replace(/^https:/, 'http:');
And when you want to convert of any specific url then
var custom_url = "put your url here"
window.location = custom_url.replace(/^https:/, 'http:');
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solved how to convert https to http using java script in html page [closed]