How to catch exception in node during JSON parse

0 votes

My node server dies when it is unable to parse JSON in the following line:

var json = JSON.parse(message);

How to catch exceptions in node, but I am still not sure what is the proper way to wrap a try and catch block around this statement. My goal is to catch the exception and log an error to the console, and of course keep the server alive. Thank you.

Nov 27, 2020 in Node-js by kartik
• 37,510 points
1,832 views

1 answer to this question.

0 votes

Hello,

JSON.parse runs synchronous and does not know anything about an err parameter as is often used in Node.js. Hence, you have very simple behavior: If JSON parsing is fine, JSON.parse returns an object; if not, it throws an exception that you can catch with try / catch, just like this:

webSocket.on('message', function (message) {
  var messageObject;

  try {
    messageObject = JSON.parse(message);
  } catch (e) {
    return console.error(e);
  }

  // At this point, messageObject contains your parsed message as an object.
}
answered Nov 27, 2020 by Niroj
• 82,720 points

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