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TypeError: Cannot read properties of undefined (reading 'error')This error occurs when your code attempts to access a property named '.error' on a variable that is currently 'undefined'. In modern web applications, this often happens during API calls when a component tries to read an error status before the data has loaded or when a response object is missing expected fields.
The modern solution is to use the ?. operator, which gracefully returns undefined instead of crashing the app.
const err = response?.error;Use nullish coalescing to ensure you always have a valid object to read from.
const data = response || { error: 'Unknown fallback error' };