Backend languages and frameworks

const express = require('express');
const app = express();

app.get('/api/hello', (req, res) => {
  const name = req.query.name || 'friend';
  res.json({ message: 'Hello, ' + name });
});

app.listen(3000, () => console.log('Listening on port 3000'));

from fastapi import FastAPI

app = FastAPI()

@app.get("/api/hello")
def hello(name: str = "friend"):
    return {"message": f"Hello, {name}"}

# Start it with: uvicorn main:app --reload

# views.py
from django.http import JsonResponse

def hello(request):
    name = request.GET.get("name", "friend")
    return JsonResponse({"message": f"Hello, {name}"})

# urls.py
from django.urls import path
from . import views

urlpatterns = [
    path("api/hello", views.hello),
]

package com.example.demo;

import java.util.Map;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @GetMapping("/api/hello")
    public Map<String, String> hello(@RequestParam(defaultValue = "friend") String name) {
        return Map.of("message", "Hello, " + name);
    }
}

<?php
// routes/api.php
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Route;

Route::get('/hello', function (Request $request) {
    $name = $request->query('name', 'friend');
    return response()->json(['message' => 'Hello, ' . $name]);
});

package main

import (
    "encoding/json"
    "net/http"
)

func hello(w http.ResponseWriter, r *http.Request) {
    name := r.URL.Query().Get("name")
    if name == "" {
        name = "friend"
    }
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(map[string]string{"message": "Hello, " + name})
}

func main() {
    http.HandleFunc("GET /api/hello", hello)
    http.ListenAndServe(":8080", nil)
}