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##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Write helpful error messages
Good error messages explain what went wrong and how to fix it. Include the invalid value and expected format.
// Bad
throw new Error("Invalid input");
// Good
throw new Error(
`Expected email format, got: ${input}`
);
Messages should help developers debug without exposing sensitive data.