Question

每当我点击端点时，我都会在本地生成的文件正确并且包含我需要的所有字段时保持空文件。我已经尝试直接用于响应，但我会得到：

不能管道，不可读

当然可能有些事我做错了。

const PORT = 3000;

const express = require('express');
const fs = require('fs');
const csv = require('fast-csv');

const app = express();

app.listen(PORT, () => {
console.log(`Express server is listening on ${PORT}`);
});

app.get('/rates/csv', (req, res) => {

let ws = fs.createWriteStream(__dirname + '/tmp/rates.csv');

csv.write([
    ["a", "b"],
    ["a1", "b1"],
    ["a2", "b2"]
], {headers: true})
    .pipe(ws);

console.log('FILE SAVED');

res.download(ws.path, 'rates.csv')
});

Answer 1

您无法将可写流传输到另一个可写流。

https://medium.freecodecamp.org/node-js-streams-everything-you-need-to-know-c9141306be93

Express：下载返回空文件

1 个答案: