Don't worry about Wialon migration to JSON standard ECMA-404.
In most cases Your apps will work correctly.
Here are some main nuances which You should check:
1. All keys and string values must be double quoted: {"key":"value"} - no keys without quotes or in single quotes
2. All numeric values must be decimal: {"key":256} - no hex-values, like 0xff
3. Spaces are only allowed inside double quoted string values: {"key":"value with space"}
For Your convenience we are working over deployment of remote-api service (like hst-api.wialon.com) for testing Your apps with new JSON standart.
As soon as it will be ready we'll notify You here.
Don't hurry up to make changes in Your code, just wait a little for testing dns.
Head of Wialon Local Department
Gurtam