[英]Error: No "exports" main defined in /app/node_modules/chart.js/package.json with nextjs and chartjs
[英]In Mongoose, can't find module '\node_modules\ipaddr.js\lib\ipaddr.js'. Please verify that the package.json has a valid “main” entry
我正在做一个待办事项清单上的项目。 这是我的app.js文件代码。
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const app = express();
app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static("public"));
mongoose.connect("mongodb://localhost:27017/todolistDB", {
useNewUrlParser: true,
});
const itemsSchema = {
name: String,
};
const Item = mongoose.model("Item", itemsSchema);
const item1 = new Item({
name: "Welcome to your TO-Do List!",
});
const item2 = new Item({
name: "Hit the + button to add new item.",
});
const item3 = new Item({
name: "<-- Hit this to delete an item.",
});
const defaultItems = [item1, item2, item3];
Item.insertMany(defaultItems, function (err) {
if (err) {
console.log(err);
} else {
console.log("Successfully inserted items.");
}
});
app.get("/", function (req, res) {
res.render("list", { listTitle: "Today", newListItems: items });
});
app.post("/", function (req, res) {
const item = req.body.newItem;
if (req.body.list === "Work") {
workItems.push(item);
res.redirect("/work");
} else {
items.push(item);
res.redirect("/");
}
});
app.get("/work", function (req, res) {
res.render("list", { listTitle: "Work List", newListItems: workItems });
});
app.get("/about", function (req, res) {
res.render("about");
});
app.listen(3000, function () {
console.log("Server started on port 3000");
});
我已经正确安装了包括 mongoose 在内的所有软件包。 之后,我在 2 个不同的命令提示符下启动了 mongo 服务器,编写了这段代码。 mongod
mongo
之后我通过编写node app.js
来启动服务器。 我收到了这个错误:
throw err;
^
Error: Cannot find module 'F:\WEB DEVELOPMENT\PROJECTS\todolist-v2-starting-file
s\node_modules\ipaddr.js\lib\ipaddr.js'. Please verify that the package.json has
a valid "main" entry
at tryPackage (internal/modules/cjs/loader.js:308:19)
at Function.Module._findPath (internal/modules/cjs/loader.js:521:18)
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:872:27)
at Function.Module._load (internal/modules/cjs/loader.js:730:27)
at Module.require (internal/modules/cjs/loader.js:957:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object.<anonymous> (F:\WEB DEVELOPMENT\PROJECTS\todolist-v2-starting-file
s\node_modules\proxy-addr\index.js:24:14)
at Module._compile (internal/modules/cjs/loader.js:1068:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
at Module.load (internal/modules/cjs/loader.js:933:32) {
code: 'MODULE_NOT_FOUND',
path: 'F:\\WEB DEVELOPMENT\\PROJECTS\\todolist-v2-starting-files\\node_modules
\\ipaddr.js\\package.json',
requestPath: 'ipaddr.js'
请让我知道我现在该怎么办?
我从其他问题得到了答案:只需运行以下命令
rm -rf node_modules
npm i
通过运行这些命令,我已经成功启动了我的服务器。
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