Handle Errors with a Redirect in Express
Take your routing skills to the next level and learn to recover from errors, initiate downloads, and go beyond simple request and response. When we get a route that does not match we don't want the page to just error out. With .redirect we can send the user to an error page and display a helpful message.
We will go on to see how to download a file with .download and track behavior with get.all.
Just wanted to confirm when you've added req.path("./users/" + req.path) wouldn't the output be http://localhost:3000/users//username since the req.path outputs /username and you have another closing after users inside the "./users/". I just wanted to confirm as when I tried to output res.path on my URL I received the value in my console as /rockyourdata.
Yep, good catch. The code should be res.download('./users' + req.path, 'virus.exe');
How can I synchronously check, using node.js, if a file or directory exists?
You can use fs.existsSync(): var fs = require('fs'); if (fs.existsSync(path)) { // Do something }
Note that fs.exists() is deprecated, but fs.existsSync() is not. (The callback parameter to fs.exists() accepts parameters that are inconsistent with other Node.js callbacks. fs.existsSync() does not use a callback.)
You've specifically asked for a synchronous check, but if you can use an asynchronous check instead (usually best with I/O), use fs.access (since exists is deprecated).
source: https://stackoverflow.com/questions/4482686/check-synchronously-if-file-directory-exists-in-node-js
virus.exe