Error Handling

First, we need a function to return the error message:

export const getErrorMessage = (error: unknown): string => {
  let message: string;
 
  if (error instanceof Error) {
    message = error.message;
  } else if (error && typeof error === "object" && "message" in error) {
    message = String(error.message);
  } else if (typeof error === "string") {
    message = error;
  } else {
    message = "Something went wrong";
  }
 
  return message;
};

export interface ApiResponse<T> {
  data: T;
  message: string;
  status: number;
}

Let's fetch something:

"use server";
 
export const fetchCurrentUser = async (): Promise<ApiResponse<any>> => {
  try {
    const res = await fetch("...");
 
    const data = await res.json();
 
    if (!res.ok) {
      return {
        data: {},
        message: data.message || "Something went wrong",
        status: res.status,
      };
    }
 
    return {
      data,
      message: "SUCCESS",
      status: res.status,
    };
  } catch (error) {
    return {
      data: {},
      message: getErrorMessage(error),
      status: 500,
    };
  }
};