JavaScript (ES2026) reference · JSON and Global Functions

JavaScript decodeURIComponent() Function

Decode a URL component encoded by encodeURIComponent(), turning %20-style escapes back into characters.

JavaScript (ES2026) Since ES3

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Syntax

decodeURIComponent(encoded)

Parameter	Description
`encoded`	An encoded string.

A decoded string.

Decode a valueTry it yourself

console.log(decodeURIComponent("tea%20%26%20cake%3F"));

Output

tea & cake?

Malformed input throws URIErrorTry it yourself

try {
  decodeURIComponent("%E0%A4%A");
} catch (e) {
  console.log(e.name);
}

Output

URIError

Version	Change
JavaScript ES3	Added

encodeURIComponent() · Encode a string for use as one part of a URL (a query value or path segment), escaping &, =, ?, / and spaces.
decodeURI() · Decode a full URL encoded by encodeURI(), keeping escape sequences that represent reserved URL characters.
JavaScript Fetch API · tutorial