The spawn is a method in NodeJS that spawns an external application through a new process and finally returns a streaming interface for I/O. It is excellent for handling applications that produce a large amount of data or for working with streams of data as it reads in.

Example

                                        

Here’s an example how child process have the ability to use the spawn method:

const { spawn } = require('child_process');
const ls = spawn('ls', ['-lh', '/usr']);

ls.stdout.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

ls.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

ls.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

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