URIError

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

* Some parts of this feature may have varying levels of support.

The URIError object represents an error when a global URI handling function was used in a wrong way.

URIError is a serializable object, so it can be cloned with structuredClone() or copied between Workers using postMessage().

URIError is a subclass of Error.

Constructor

URIError()

Creates a new URIError object.

Instance properties

Also inherits instance properties from its parent Error.

These properties are defined on URIError.prototype and shared by all URIError instances.

URIError.prototype.constructor

The constructor function that created the instance object. For URIError instances, the initial value is the URIError constructor.

URIError.prototype.name

Represents the name for the type of error. For URIError.prototype.name, the initial value is "URIError".

Instance methods

Inherits instance methods from its parent Error.

Examples

Catching an URIError

js
try {
  decodeURIComponent("%");
} catch (e) {
  console.log(e instanceof URIError); // true
  console.log(e.message); // "malformed URI sequence"
  console.log(e.name); // "URIError"
  console.log(e.stack); // Stack of the error
}

Creating an URIError

js
try {
  throw new URIError("Hello");
} catch (e) {
  console.log(e instanceof URIError); // true
  console.log(e.message); // "Hello"
  console.log(e.name); // "URIError"
  console.log(e.stack); // Stack of the error
}

Specifications

Specification
ECMAScript® 2026 Language Specification
# sec-native-error-types-used-in-this-standard-urierror

Browser compatibility

See also