API calls that return select post bodies throw JSON errors

Question

When calling the Stack Exchange API to get the post body, it will return an error for some posts. EG:
/docs/questions#page=13&pagesize=100&fromdate=2013-09-01&todate=2013-09-02&order=asc&sort=creation&filter=!9ciXf5l7v&site=stackoverflow throws:

Invalid JSON returned

But if we exclude the post body, EG:
/docs/questions#page=13&pagesize=100&fromdate=2013-09-01&todate=2013-09-02&order=asc&sort=creation&filter=default&site=stackoverflow , it works fine.

We suspect it’s because the post body contains some characters like “\0” which makes the returned JSON invalid.

Answer 1

This was fixed in the latest deploy.

Root cause: I had let a copy of our JSON serializer (currently ServiceStack.Text) get out of date.