Safely encode and decode strings for URI compatibility
System Definition BlockEncode or decode strings for URI compatibility according to RFC 3986. Safely prepare URL components for web browsers, API requests, and search engine friendly links.
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The tool leverages native browser APIs (`encodeURIComponent` and `decodeURIComponent`) to parse your input string. When encoding, it identifies any character outside the safe ASCII range and replaces it with a `%` symbol followed by its exact two-digit hexadecimal representation. When decoding, it reverses the process, safely unpacking the hexadecimal payload back into human-readable text.
function buildSearchQuery(term) {
// encodeURIComponent is safer than encodeURI for query params
const safeTerm = encodeURIComponent(term);
return `https://api.wtkpro.site/search?q=${safeTerm}`;
}
// Input: "apple & banana"
// Output: "apple%20%26%20banana"Spaces are not allowed in valid URLs because they can break HTTP request headers. The standard percent-encoding for a space character is `%20`. In some specific contexts (like form data submissions), a space is encoded as a `+` symbol, but `%20` is the universally safer choice for general URLs.
`encodeURI` is meant for encoding a full, complete URL; it ignores structural characters like `/`, `?`, and `&` so the link still works. `encodeURIComponent` is much more aggressive and is used to encode a *single parameter* inside a URL. It encodes `/`, `?`, and `&` to prevent those characters from accidentally creating new, unintended parameters.
Yes. If you run a string through an encoder twice, the `%` symbol from the first encoding will itself be encoded into `%25` (e.g., `%20` becomes `%2520`). This causes broken links and server errors. Always ensure you are only encoding raw strings once.
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