Node.js

notes

• if your request is empty, check if you have body-parser
• res.send() can’t send a number, you should respond with object { result: number }

post request with fetch

     fetch("https://cyf-chat-server--ahmadali5.repl.co/messages/newMessage", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(newMsg)
        })

Get the full url of the route

  var fullUrl = req.protocol + '://' + req.get('host') + req.originalUrl;

error anatomy

    var err = { message: "error message", // accessed by err or err.message
                stack: "c:\pth\to\file",
                errors: { /* more error data */ }
                }

global object

global object contains functions, vars and objects we can use without requiring any external module. and it contains:

1. console: console.log(any)
2. __dirname: gives us the absolute path to the current directory.
3. __filename: gives us the absolute path to the current file.
4. require() function: import other modules.
5. process object: contains info about the current process.

Require() function

1. node core modules.
2. our own modules.
3. third party modules

path module

1. path.basename(): get the file name only. path.basename(__filename)

process object

1. process.pid : get current process id.
2. process.versions.node: get current node version.
3. get environment information and vars.
4. communicate with the terminal or parent processes through standard input and standard output.
5. process.argv: get an array of all arguments passed to this process.
6. process.stdout, process.stdin: regulates interactions between terminal and our program.
7. exit the current process. process.exit()