Recursive Error Chaining with the 'cause' Property

Snippet

Recursive Error Chaining with the 'cause' Property

The 'cause' property in the Error constructor allows for structured error wrapping. This preserves the original error context while providing a high-level message, which is essential for debugging complex service architectures in Node.js.

snippet.js
javascript
async function fetchData() {
  try {
    await db.query('SELECT...');
  } catch (dbErr) {
    throw new Error('Failed to retrieve user data', { cause: dbErr });
  }
}
 
try {
  await fetchData();
} catch (err) {
  console.error(err.message);
  console.error('Original source:', err.cause.message);
}

nodejs

Breakdown

{ cause: dbErr }

Passes the original error as metadata to the new Error instance.

err.cause

Accesses the nested error object for deep diagnostic analysis.

Previous snippet Next snippet

More Expert JavaScript exercises →

From your library

Recursive Error Chaining with the 'cause' Property

Related