Express:从内容类型“application/json;charset=utf-8”中删除charset=utf-8

我有一个基于NodeJS和express的应用程序。每次我试图得到回应,我都会得到 Content-Type: "application/json; charset=utf-8" . 我无法在前端分析此内容,因为我期望的是带有头的响应 Content-Type: "application/json" .

我试过了 res.setHeader, res.set 方法也一样,但似乎没有任何帮助。任何建议都很感激。

以下是我的快速代码:

const app = express();

configureMongoClient();

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cookieParser());
app.options('*', cors())

app.use("/api-docs", swaggerUi.serve, swaggerUi.setup(swaggerDocument));

app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET, PUT, POST');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept, X_BPI_CONTEXT');
    res.header("Content-Type", "application/json")
    next();
});
app.use("/users", usersRouter);
app.use(express.static(path.join(__dirname, "public")));

我的前端呼叫如下:

fetch(uri, {
    method: "POST",
    headers: {
      Content-Type: "application/json"
    },
    body: JSON.stringify(requestData),
  })
    .then((response) => {
      debugger;
      return response.json()
    }) .then((data) => {
        console.log(data);
      });