Node.js: Passing image as base64 to python with spawn

Question

I'm trying to pass an image as base64 to python for processing using spawn like so:

return new Promise(function(resolve, reject) {
      const pythonProcess = spawn('python',["./python.py", imageDataURI]);
      pythonProcess.stdout.on('data', (response) => {
        resolve(response);
      });
    });

But I'm getting error: Error: spawn E2BIG I guess it's too big to pass like this, any alternative ways to pass it to spawn?

Seems related:

Node / child_process throwing E2BIG

Answer 1

Thanks to ottomeister's answer I did it like this:

In Node:

const pythonProcess = spawn('python',["script.py"]);

pythonProcess.stdin.write(data);
pythonProcess.stdin.end();
pythonProcess.stdout.on('data', (result) => {
    handleResult(result);
});

In python:

import fileinput

for line in fileinput.input():
    input +=line

# Process input

sys.stdout.write(result)
sys.stdout.flush()