Minor issue: JSON encoder adds a backslash before every "/" in the string. While JSON spec allows to escape "/", it's not required, and escaping it reduces readability of the encoded data, and unnecessarily increases the size of the encoded string.

Could you consider not escaping the forward slash?

This is a duplicate of #8. Don't know how I missed the original :(. I don't think I can close it myself. Sorry about it.

Merging it to #8.

Thanks.