Node child process spawn. js event loop. The exec() and spawn() methods are some of the frequently used Node. Spawned Child Processes Spawn returns a childObject, which you can then listen for events with. Otherwise, use the spawn() command, as shown in this tutorial. If omitted, args defaults to an empty array. While for 'exec': Spawns a shell then executes the command within that shell, buffering any generated output. js child process module methods. Fork is useful when you want to send individual messages — e. transferring a 1 Gigabyte video, image, or log file. JSON or XML data messages. spawnSync () function provides equivalent functionality in a synchronous manner that blocks the event loop until the spawned process either exits or is terminated. The child_process. There are four different ways to create a child process in Node: spawn(), fork(), exec(), and execFile(). Spawn is useful when you want to make a continuous data transfer in binary/encoding format — e. We’re going to see the differences between these four functions and when to use each. spawn launches a command in a new process: const { spawn } = require('child_process') const child = spawn('ls', ['-a', '-l']); You can pass arguments to the command executed by the spawn as array using its second argument. g. Use the exec() method to run shell-like syntax commands on a small data volume. . spawn() method spawns a new process using the given command, with command line arguments in args. The child_process. spawn () method spawns the child process asynchronously, without blocking the Node. nnqcbgongbniypondidvbwgzthmtruauafnmmrirskzudmbbj