将json数据从angular发布到nodejs

import { HttpClient } from '@angular/common/http';

@Injectable()
export class DataService {
  constructor(private http: HttpClient) { }

  sendData(data: any) {
    return this.http.post('/api/data', data);
  }
}

const express = require('express');
const router = express.Router();

router.post('/data', (req, res) => {
  const jsonData = req.body;
  // 处理接收到的JSON数据
  // ...
  res.send('Data received');
});

module.exports = router;

const express = require('express');
const app = express();
const dataRoute = require('./routes/data');

app.use(express.json());
app.use('/api', dataRoute);

app.listen(3000, () => {
  console.log('Server started on port 3000');
});

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-root',
  template: `
    <button (click)="sendData()">Send Data</button>
  `,
})
export class AppComponent {
  constructor(private dataService: DataService) { }

  sendData() {
    const jsonData = { name: 'John', age: 30 };
    this.dataService.sendData(jsonData).subscribe(
      response => {
        console.log(response);
      },
      error => {
        console.error(error);
      }
    );
  }
}