stdout always cuts off the stream at character 8192

Question

I am using spawn module and executing curl command and getting JSON response from server. This is my code -

var spawn = require('child_process').spawn;
log.debug("Executing curl command for getting all artifacts");

var artifacts_data = spawn('bash module_features/init_get_all_artifacts.sh', [
    host_url, access_token, project_id
], {
        shell: true
   });
artifacts_data.stdout.setEncoding('utf8');
var stdout = "";
artifacts_data.stdout.on('data', (data) => {
    stdout += data.toString();
    try {
        var artifact_array = JSON.parse(stdout);
        log.debug(artifact_array);
        if (artifact_array != null || artifact_array != undefined){
            res.send(200, { status: 'success', message: artifact_array });
        }else{
            log.debug('Artifact list not found.');
            res.send(400, { status: 'error', message: 'In else :: somthing went wrong' });
        }
    } catch (error) {
        log.debug("There was some error in parsing artifacts JSON");
        res.send(400, { status: 'error', message: 'somthing went wrong' });
    }

});

But, I got half string (8192 characters) and which is incorrect JSON. Please help me to increase character limit of stdout or any alternative solution.

Any help is appreciated.

Answer 1

And I fixed the issue.

var data = '';
artifacts_data.stdout.on('data',(data) => {
    stdout += data.toString();
});

artifacts_data.stdout.on('end',(data) => {
    try {
         var artifact_array = JSON.parse(stdout);
         log.debug(artifact_array);
         if (artifact_array != null || artifact_array != undefined){
            res.send(200, { status: 'success', message: artifact_array });
         }else{
              log.debug('Artifact list not found.');
              res.send(400, { status: 'error', message: 'In else :: somthing went wrong' });
         }
    } catch (error) {
          log.debug("There was some error in parsing artifacts JSON");
          res.send(400, { status: 'error', message: 'somthing went wrong' });
    }

});

If we are dealing with IO in a web application we have to stick with the async methods.