javascript / intermediate
Snippet
Contextual Debugging with Error Cause
The 'cause' property in the Error constructor allows you to wrap an original error inside a new one. This preserves the stack trace and context of the root cause while allowing for higher-level error messages.
snippet.js
javascript
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try {try {throw new Error('Database connection failed');} catch (err) {throw new Error('Login failed', { cause: err });}} catch (wrapperError) {console.log(wrapperError.message); // 'Login failed'console.log(wrapperError.cause.message); // 'Database connection failed'}
Breakdown
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throw new Error('Login failed', { cause: err });
Wraps the low-level error 'err' inside a user-facing error.
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wrapperError.cause
Accesses the original error object for deeper investigation.
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console.log(wrapperError.cause.message);
Retrieves the specific reason why the operation initially failed.