node-js-api-response-ts/src/ApiResponse.ts

Unified API response and error handling for Express.js in TypeScript. This package provides a middleware for consistent API responses and error handling in Express applications, making it easier to manage API responses and errors in a standardized way.

import { Response } from 'express';

interface SuccessResponse<T = any> {
    statusCode: number;
    status: boolean;
    message: string;
    data?: T;
}
export class ApiResponse<T = any> {
    public statusCode: number;
    public message: string;
    public data: T;
    public status: boolean;

    constructor(statusCode: number, data: T, message = 'success') {
        this.statusCode = statusCode;
        this.message = message;
        this.data = data;
        this.status = statusCode < 400;
    }

    toJSON(): SuccessResponse<T> {
        const response: SuccessResponse<T> = {
            statusCode: this.statusCode,
            status: this.status,
            message: this.message,
        };
        if (this.data !== undefined && this.data !== null) {
            response.data = this.data;
        }
        return response;
    }
}

export const SuccessResponse = <T>( res: Response, statusCode: number, data: T, message: string ) => {

    const apiResponse = new ApiResponse<T>(statusCode, data, message);
    
    // const response: SuccessResponse<T> = {
    //     statusCode: result.statusCode,
    //     message: result.message,
    //     status: result.status,
    //     ...(data !== undefined && data !== null && { data: result.data })
    // };

    res.status(statusCode).json(apiResponse.toJSON());
};