javascript - Req.body为空node.js和express

Question

我试图将字符串从客户端页面发送到服务器，但服务器收到一个空对象。这是我的客户端代码:

fetch("/sugestions/sugestions.txt", {
  method: "POST",
  body: JSON.stringify({ info: "Some data" }),
  headers: {
    "Content-Type": "application/json; charset=utf-8"
  }
})
  .then(res => {
    if (res.ok) console.log("Yay it worked!");
    else window.alert("Uh oh. Something went wrong!\n" + res);
  });

这是我的服务器端代码:

const express = require("express");
const url = require("url");
const fs = require("fs");
const bodyParser = require("body-parser");

const app = express();
const port = process.env.PORT || 8080;

app.set("view engine", "ejs");
app.use(bodyParser());

app.post("/sugestions/*", (req, res) => {
  info = JSON.parse(req.body);
  fs.appendFile(path("req").pathname, info.info, (err) => {
    if (err) res.status(404).end();
    else res.status(200).end();
  });
});

app.listen(port);

这是路径函数，以防万一:

const path = req => url.parse(`${req.protocol}://${req.get("host")}${req.originalUrl}`, true);

Answer 1

从express 4.16.0开始，您可以使用app.use(express.json());从请求中获取json数据，在您的情况下是这样。您不需要使用 bodyparser 等。

const express = require("express");
const url = require("url");
const fs = require("fs");
const bodyParser = require("body-parser");

const app = express();
const port = process.env.PORT || 8080;

app.set("view engine", "ejs");
app.use(express.json())// add this line

app.post("/sugestions/*", (req, res) => {
  info = JSON.parse(req.body);
  fs.appendFile(path("req").pathname, info.info, (err) => {
    if (err) res.status(404).end();
    else res.status(200).end();
  });
});

app.listen(port);