如何使用 Node.js 实现一个上传图片接口

mkdir upload-image-api && cd upload-image-api
npm init -y

npm install express multer

const express = require("express");
const multer = require("multer");
const path = require("path");
const app = express();
// 设置存储路径和文件名称
const storage = multer.diskStorage({
  destination: path.join(__dirname, "uploads"),
  filename: (req, file, cb) => {
    const uniqueSuffix = Date.now() + "-" + Math.round(Math.random() * 1e9);
    cb(
      null,
      file.fieldname + "-" + uniqueSuffix + path.extname(file.originalname)
    );
  },
});
// 创建文件上传中间件
const upload = multer({ storage: storage });
/**
 * 处理文件上传请求
 * upload.single('image') 函数中 `image` 为接收文件的参数名
 */
app.post("/upload", upload.single("image"), (req, res, next) => {
  if (!req.file) {
    return res.status(400).json({ error: "No file uploaded" });
  }
  const filePath = req.file.path;
  res.json({ filePath: filePath });
});
// 启动服务器
const port = 3000;
app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});