I am getting this error when I run npm start to run my express app. my app.js code my index.js code I am quirte new to using Node and express. I cant see where I have gone wrong. Can anybody see what my problem is?
If your are using express above 2.x, you have to declare app.router like below code. Please try to replace your code with Please click here to get more details about app.router Note: app.router is depreciated in express 3.0+. If you are using express 3.0+, refer to Anirudh’s answer below.
The res object in Express is a subclass of Node.js’s http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and finally res.end(data). The error “Error: Can’t set headers after they are sent.” means that you’re already in the Body or Finished … Read more
So what is this “require?” require() is not part of the standard JavaScript API. But in Node.js, it’s a built-in function with a special purpose: to load modules. Modules are a way to split an application into separate files instead of having all of your application in one file. This concept is also present in other languages … Read more
This is because require() does not exist in the browser/client-side JavaScript. Now you’re going to have to make some choices about your client-side JavaScript script management. You have three options: Use the <script> tag. Use a CommonJS implementation. It has synchronous dependencies like Node.js Use an asynchronous module definition (AMD) implementation. CommonJS client side-implementations include (most of them require a build step before you … Read more
In the terminal, you are running the node application and it is running your script. That is a very different execution environment than directly running your script in the browser. While the Javascript language is largely the same (both V8 if you’re running the Chrome browser), the rest of the execution environment such as libraries … Read more
npm install installs dependencies into the node_modules/ directory, for the node project you’re working on. You can call install on another node.js project (module), to install it as a dependency for your project. npm run build does nothing unless you specify what “build” does in your package.json file. It lets you perform any necessary building/prep tasks for your project, prior to … Read more
According to the Javascript standard, String.replace isn’t supposed to modify the string itself. It just returns the modified string. You can refer to the Mozilla Developer Network documentation for more info. You can always just set the string to the modified value: variableABC = variableABC.replace(‘B’, ‘D’) Edit: The code given above is to only replace … Read more
The issue is caused by this: If the assertion fails, it will throw an error. This error will cause done() never to get called, because the code errored out before it. That’s what causes the timeout. The “Unhandled promise rejection” is also caused by the failed assertion, because if an error is thrown in a … Read more
Jakye is right. Only bots can achieve this (but not in field titles, beware). Just do [link text here](url here). This embed description results in: this in the embed. Clicking on it directs you to countrycode.org. Using .addField(): If you want a bot’s message to just be a hyperlink, you need to make an embed, and only … Read more