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.

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Root cause: I had let a copy of our JSON serializer (currently ServiceStack.Text) get out of date.


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