What is the method to transfer data using the next router without displaying it in the URL?

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One method to transfer data using the next router without displaying it in the URL is to use POST method instead of GET method in form submission. This can be accomplished by setting the method attribute to "POST" in the HTML form tag. The data submitted by the form will then be sent in the request body instead of the URL query string. Additionally, you can use encryption methods to increase the security of the data being transferred.