What about JSON5 style for JSON5.stringify() in Espruino?

JSON

var json = {a:1,b:2};   
var data = JSON.stringify(json);  // '{"a":1,"b":2}'

JSON5

var json = {a:1,b:2};
var data = JSON5.stringify(s);     // "'{a:1,b:2}'"

Possible workaround to convert standard JSON to JSON5 for .stringify()

var json = {a:1,b:2}; 
var data = JSON.stringify(json).replace(/\"/g, '');  // '{a:1,b:2}'

But how to convert a JSON5 data string back to a json object in Espruino?

Try E.toJS? This is basically JSON5, but I think things like pin names and functions can also be dumped.

For parsing, you can just use eval - but obviously you need to be able to trust the data since there are security issues there (any JS code in the input will get executed!).

first shot

var json = {a:1,b:2}; 
var data = JSON.stringify(json).replace(/\"/g, '');  // '{a:1,b:2}'
var j = E.toJS(data)     // "\"{a:1,b:2}\""

Ok, no error but no object - whats missing ?

that .replace won't work with string values like {a:"Hello",b:2};

as for converting - quick and dirty may be eval('('+data+')')

Yes, text in json will not be covered ....

ok so let's sum it up

var json = {a:"1",b:2};
data = E.toJS(json);    // {a:\"1\",b:2}"
j = eval('('+data+')');  // {  a: "1", b: 2 }

So, JSON5 is possible on Espruino devices - thanks.