execute node command from js file code example

Example 1: node execute shell commands

const { exec } = require("child_process");
exec("cat index.js", (error, data, getter) => {
	if(error){
		console.log("error",error.message);
		return;
	}
	if(getter){
		console.log("data",data);
		return;
	}
	console.log("data",data);

});

Example 2: execute terminal command nodejs

// You can use 'exec' this way
// LINUX EXAMPLE

const { exec } = require("child_process");

exec("ls -la", (error, stdout, stderr) => {
    if (error) {
        console.log(`error: ${error.message}`);
        return;
    }
    if (stderr) {
        console.log(`stderr: ${stderr}`);
        return;
    }
    console.log(`stdout: ${stdout}`);
});

Example 3: how to run a js file in node

Save your .js file in the same folder as node.js,
For windows , Usually location is- "C:\Program Files\nodejs"
Open 'Command prompt and locate node.js folder' OR directly open 'Node.js command prompt' and type 
>> node (file_name).js

Example 4: how to send a command in js

<form action="">
  <select name="channel">
   <option value="#channel1">channel1</option>
   <option value="#channel2">channel2</option>
  </select>
 </form>