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Encode and decode URL components with encodeURIComponent vs encodeURI modes, plus a query-string formatter for form payloads.
https%3A%2F%2Fexample.com%2Fsearch%3Fq%3Dfrontend%20developer%26lang%3Den%23results
Percent-encoding rules, reserved characters, and the query-string bugs that break payment redirects — in one email.
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