CODEWITHSUNDEEP
javascripttypescriptexpresserror-handling
asobirov
asobirov

Reputation: 582

Make error inside `try` not handled by `catch`

I want the specific errors that are thrown inside try block not to be handled by catch(err)

Example:

const someFunc = async () => {
  ...
  try {
    ...
    // This error should not be handled by the catch and go straight to the middleware
    throw {
      status: 404,
      message: "Not Found",
    };
  } catch (error) {
    throw {
      status: 500,
      message: "Something went wrong",
      reason: error,
    };
  }
};

After that the middleware handles the errors.

export const errorHandler: ErrorRequestHandler = (err, req, res, next) => {
  const { status = 500, message, reason } = err;
  res.status(status).json({
    success: false,
    message: message || "Something went wrong",
    reason: reason || undefined,
  });
};

Upvotes: 0

Views: 1098

Answers (1)

Ivar
Ivar

Reputation: 6868

If you throw an error inside a try-block, the catch will catch it. The best you can do is to check in the catch-block if the error you don't want to catch is thrown and if so, rethrow it.

const someFunc = async () => {
  try {
    throw {
      status: 404,
      message: "Not Found",
    };
  } catch (error) {
    // If a 404 error is caught, rethrow it.
    if (error.status === 404) {
      throw error;
    }

    throw {
      status: 500,
      message: "Something went wrong",
      reason: error,
    };
  }
};

Upvotes: 5

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