JSON API doesn't work with more than 10 comments

You may need to add count=100 or whatever you choose as your max number of comments.

I visited those pages and I think it could be multiple issues so I’ll suggest a few things. I’ve had other plug-ins interfering with the output before so I would disable them one by one and see if it fixes anything. It also looks like you are using fancy URL’s, (so “site.com/name-of-post/” versus “site.com/?p=100”. There is a different syntax for fancy URLs, see http://ww.wp.xz.cn/plugins/json-api/other_notes/. Also, visit the JSON-API plug-in page and see if there is a option to enable fancy URLs. You can also check the path you should use for your site. I don’t use them myself. You could also try accessing the post by query string even with fancy URLS. So for example, use, “/?p=200&json=1” but replace 200 with the id of your blog post.