Logging large strings from Flutter

Question

I\'m trying to build a Flutter App and learning Dart in the process, but I\'m getting kind of frustrated when debugging. I have fetched a resource from an API and now I want

Answer 1

How about using the Flutter log from the dart: developer library. This does not seem to be the maximum length limit like print() or debugPrint(). This is the only solution that seems to work fine. Try it as below:

log(reallyReallyLongText)

The output will be the entire long string without breaks and prefixed with [log]

Answer 2

If you run the application in android studio it will truncate long string.

In xcode 10.2 which i am using long string is not truncating.

My suggestion is write print statement logs and run the application in Xcode instead of android studio.

Answer 3

You can make your own print. Define this method

void printWrapped(String text) {
  final pattern = RegExp('.{1,800}'); // 800 is the size of each chunk
  pattern.allMatches(text).forEach((match) => print(match.group(0)));
}

Use it like

printWrapped("Your very long string ...");

Credit

Answer 4

Use debugPrint with the optional parameter to wrap according to the platform's output limit.

debugPrint(someSuperLongString, wrapWidth: 1024);

Answer 5

Use this method

JsonEncoder encoder = new JsonEncoder.withIndent('  ');
String prettyprint = encoder.convert(yourJsonString);
debugPrint(prettyprint);

But it works only with JSON strings, I have not idea about how to do with "normal" strings. The first thing I think is to add manually a \n after every n characters, for now, while waiting for a stable fix!

Answer 6

Please try debugPrint('your output'); instead of print('your output'); the documentation is here if you would like to read. debugPrint throttles the output to a level to avoid being dropped by android's kernel as per the documentation.