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Error: lineNumber - JavaScript | MDN
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Error: lineNumber

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

The lineNumber data property of an Error instance contains the line number in the file that raised this error.

In this article

Value

A positive integer.

Property attributes of Error: lineNumber
Writableyes
Enumerableno
Configurableyes

Examples

Using lineNumber

js
try {
  throw new Error("Could not parse input");
} catch (err) {
  console.log(err.lineNumber); // 2
}

Alternative example using error event

js
window.addEventListener("error", (e) => {
  console.log(e.lineNumber); // 5
});
const e = new Error("Could not parse input");
throw e;

This is not a standard feature and lacks widespread support. See the browser compatibility table below.

Specifications

Not part of any standard.

Browser compatibility

See also

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This page was last modified on Jul 10, 2025 by MDN contributors.

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  1. Standard built-in objects
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  14. Related pages
  15. AggregateError
  16. EvalError
  17. InternalError
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  20. SyntaxError
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