javascript / intermediate
Snippet
Contextual Debugging with Error Cause
The 'cause' property in the Error constructor allows you to wrap lower-level errors in higher-level context without losing the original stack trace or error details. This is essential for debugging complex flows in Node.js backends.
snippet.js
javascript
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
async function processOrder(orderId) {try {await db.save(orderId);} catch (err) {throw new Error(`Failed to process order ${orderId}`, {cause: err});}}// Catching:try {await processOrder(123);} catch (err) {console.error(err.message); // High-level messageconsole.error(err.cause); // Original database error}
nodejs
Breakdown
1
throw new Error(..., { cause: err });
Wraps the original error inside a new Error using the options object.
2
console.error(err.cause);
Accesses the underlying error that triggered the failure.