懒惰的 JSON.stringify

Question

Problem --

users use a library, to send logs to the backend. The library has a circular buffer, so that there are no more then a few hundred elements.

However, we don't control the size of the elements that are sent, so it's possible to have payloads > 10mb.

I'd like to reduce this, by asserting a limit on the overall size of the payload.

However, I don't think there is a way for me to get the size of objects.

What I'm thinking is a sort of lazy JSON.stringify

var res = "[";
messages.forEach(m => {
  if (res.length < MAX_SIZE) {
    res += JSON.stringify(m);
    res += ",";
  })
});
res += "]"

Is there a better way?

Answer 1

For posterity, it would have been simpler to do this kind of filtering before the JSON.stringify call.

ie: go over messages , replace items that are too large with "..too large.." , and then stringify.