Node.js报错：Cannot find module './setuppassport' 求助

问题场景 #

我是Node.js新手，跟着教程搭建简易网站，之前运行正常。修改app.js代码后，访问localhost:3000时终端出现模块找不到的报错，已经定位到报错行是var setUpPassport = require("./setuppassport");，但不清楚原因和解决办法。

终端报错信息 #

node:internal/modules/cjs/loader:936
  throw err;
  ^

Error: Cannot find module './setuppassport'
Require stack:
- C:\Users\Natasa\Desktop\nodejsapp\app.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)       
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (C:\Users\Natasa\Desktop\nodejsapp\app.js:11:21)   
    at Module._compile (node:internal/modules/cjs/loader:1097:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1149:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)       
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ 'C:\\Users\\Natasa\\Desktop\\nodejsapp\\app.js' ]
}

Node.js v17.3.0
[nodemon] app crashed - waiting for file changes before starting... 

我的app.js代码 #

var express = require("express");
var path = require("path");
var mongoose = require("mongoose");
var bodyParser = require("body-parser");
var cookieParser = require("cookie-parser");
var passport = require("passport");
var session = require("express-session");
var flash = require("connect-flash");
var params = require("./params/params");

var setUpPassport = require("./setuppassport");
//var routes = require("./routes");

var app = express();
mongoose.connect(params.DATABASECONNECTION, {useUnifiedTopology:true, useNewUrlParser:true, useCreateIndex:true});
setUpPassport();

app.set("port", process.env.PORT || 3000);
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({extended:false}));
app.use(cookieParser());
app.use(session({
    secret:"doemlfgddfsoi!gjdsf5684561dsf",
    resave:false,
    saveUninitialized:false
}));

app.use(passport.initialize());
app.use(passport.session());
app.use(flash());

app.use("/", require("./routes/web"));
app.use("/api", require("./routes/api"));

app.listen(app.get("port"), function(){
    console.log("Server started on port " + app.get("port"));
}) 

解决建议 #

• 检查文件是否存在：确认项目根目录（C:\Users\Natasa\Desktop\nodejsapp）下是否有setuppassport.js文件。如果没有，需要创建该文件，或者对照教程确认是否遗漏了生成该文件的步骤。
• 核对文件名拼写：确保文件名完全匹配，Node.js对文件名大小写敏感（Windows系统虽不强制区分，但保持一致可避免问题），检查是否存在拼写错误，比如写成setupPassport.js或遗漏后缀。
• 确认文件路径：./setuppassport表示该文件需与app.js在同一目录下。如果文件在子目录中，需修改路径，比如./auth/setuppassport。
• 检查文件内容：若文件存在，确认内部无语法错误，且通过module.exports正确导出了模块（比如导出初始化Passport的函数），否则也会导致加载失败。

内容的提问来源于stack exchange，提问作者pastrik