JSON Debug

JSON is a data format, originally designed from Javascript (JavaScript Object Notation), but works as a common data interchange format across a variety of languages.

Simscope uses the JSON data format for most input messages and for its REST API.

Strict JSON parsing

Simscope uses a strict JSON validator for all JSON inputs. Any JSON that is invalid will be rejected, and usually a WARNing will be printed to stdout.

For example, the following JSON:

{
    "alpha": true,
    "beta":  false,
}

... is invalid, due to a trailing comma after the beta line.

Debug: Validating JSON interactively

If you are getting JSON parse errors/warnings from Simscope, you should run the JSON through the online JSONLint validator. This tool gives useful errors as to where the parse error is.

Using the above JSON example, JSONLint prints the following error:

Error: Parse error on line 3:
...ue,	"beta": false,}
---------------------^
Expecting 'STRING', got '}'