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encodeURI vs encodeURIComponent: Key Differences Every JS Developer Should Know

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JavaScript offers two built-in URL encoding functions — encodeURI() and encodeURIComponent() — that serve distinct purposes in web development. encodeURI() is designed for complete URLs and preserves structurally significant characters such as ?, &, =, and /. encodeURIComponent(), by contrast, encodes all special characters including those structural ones, making it the correct choice for encoding individual query parameter values. Confusing the two is a common source of bugs, particularly when special characters like & appear in user input and are left unencoded in query strings. Developers are advised to always use encodeURIComponent() for query parameter values and to avoid passing raw user input directly into URLs.

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encodeURI vs encodeURIComponent: Key Differences Every JS Developer Should Know · ShortSingh