Vue API forward to nodejs backend

vue.config.js

// vue.config.js
process.env.APP_VERSION = require('./package.json').version;

module.exports = {
  /* webpack dev configuration */
  devServer: {
    host: '0.0.0.0',
    port: 8080,
    https: false,
    hotOnly: false,
    proxy: null, // string | Object
    before: app => {
      // Forwards api requests to backend
      app.use((req, res, next) => {
        if (!req.url.startsWith('/api')) return next();
        
        // Delete cached backend scripts to allow for hot-reload
        for (let path of Object.keys(require.cache)) {
          if (path.includes('backend')) {
            delete require.cache[path];
          }
        }  
        
        let path = req.url.replace(/\/api/, '').split('?')[0];
        var id = '';
        path.split('/').map(it => {
          if (/\d/.test(it)) id = it;
        });
        var event = {
          path: path,
          httpMethod: req.method,
          headers: req.headers,
          queryStringParameters: req.query,
          pathParameters: {
            id: id
          }
        }

        var body = Buffer.from('');
        req.on('data', chunk => {
          body = Buffer.concat([body, chunk]);
        });
        req.on('end', () => {
          if (req.is('multipart/form-data')) {
            event.body = body.toString('base64');
            event.isBase64Encoded = true;
          } else {
            event.body = body.toString();
          }
          
          let index = require('./backend/index');
          index.handler(event, null, (err, result) => {
            if (err) {
              res.status(500).send(err);
            } else {
              res.status(result.statusCode).set(result.headers);
              if (result.isBase64Encoded) res.end(Buffer.from(result.body, 'base64'), 'binary');
              else res.end(result.body);
            }
          });
        });       
      });
    }
  }
}