Javascript, replace "," with "." in JSON-CodePudding

I have as an input an invalid JSON string with this structure:

{
 "Seq_N":66,
 "Uptime":728,
 "Hum":33,500000,
 "Temp (C)":20,129999
}

I have no accesso to the code that produces the invalid JSON string so I can't fix the string before it's generated

In order to make the JSON string valid, I need to replace the comma character inside the Hum and Temp fields with a dot character, but I also need to keep the comma separators of the JSON string (in order not to break the JSON syntax)

Does anyone know a clean function/regex to do this?

Thanks in advance

CodePudding user response：

Negative lookahead would do the job.

const foo = '{ "Seq_N":66, "Uptime":728, "Hum":33,500000, "Temp (C)":20,129999 }';

const cleanedFoo = foo.replace(/,(?![" ])/g, ".");

console.log(JSON.parse(cleanedFoo));

The regex means:

, match comma,

(?! only if it's not followed

[" ] by either double quotes or space. (Yes, this so-called JSON is seriously malformed).

CodePudding user response：

You can use regex like this, but wouldn't it be better to edit the value before creating the json?

var json = `{
 "Seq_N":66,
 "Uptime":728,
 "Hum":33,500000,
 "Temp (C)":20,129999
}`;

json = json.replace(/("(Hum|Temp \(C\))":\d ),/g, '$1.');

console.log(json)

CodePudding user response：

If I understand the question correctly, the following code should do the job:

$(".stat-item").each(function () {
var inner_context = $(this).text();
$(this).text(inner_context.replace(/[\.] /g, ","));
});