How to retrieve object from child_process stdout?

I want to run some process on different instance than Node server. I'm trying with child_process, I create some loop and execute child_process.

process

Node

child_process

From child_process, I retrieve as Buffer and In object format like follow.

Buffer

data: , status: 'active', success: true


How should I get these data as an object format?

const child = spawn('node', ['app.js']);
child.stdout.on('data', (data) =>
// How can I apply filter over to ignore some data
console.log(data) // print buffer
console.log(data.toString()) // print some stringify Obj
);


Is there any way we can send data for child_process from app.js except console.log?

child_process

app.js

console.log

1 Answer
1

If app.js is a node script it's easy to send data to the caller (and vice-versa) for example:

index.js

const child_process = require('child_process');
const appInstance = child_process.fork('app.js', , );
appInstance.on('message', message =>
console.log('Message from app.js:', message, JSON.stringify(message));
);


app.js

// Send some data to caller.
const data = status: 'ok', message: 'hello from app.js' ;
if (process.send)
process.send(data);



If you want to filter there are loads of ways of doing this. In the message handler you can switch on the message object, e.g. if (message && message.status).

100 child_process

Thanks for contributing an answer to Stack Overflow!

But avoid …

To learn more, see our tips on writing great answers.

Required, but never shown

Required, but never shown

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.