JSON.parse JavaScript字符串

Question

In javascript, I need to parse a string into what would be the equivalent of a javascript array such as:

[["2016-12-21",101.58],["2016-12-22",209.56]]

The data I have, along with my attempt at parsing it and the error message looks like this:

str = "[["2016-11-17",771.22998],["2016-11-16",764.47998],["2016-11-15",758.48999],["2016-11-14",736.080017],["2016-11-11",754.02002],["2016-11-10",762.559998],["2016-11-09",785.309998],["2016-11-08",790.51001],["2016-11-07",782.52002],["2016-11-04",762.02002],["2016-11-03",762.130005],["2016-11-02",768.700012],["2016-11-01",783.609985],["2016-10-31",784.539978]]"

JSON.parse(str)

Uncaught SyntaxError: Unexpected token & in JSON at position 2(…)

I attempted to remove some of the special characters from the string (&, #, ;, etc.), which slightly changed the error message, but I was never able to get to my end result. I figured I would put it in stackoverflow starting from the beginning, because there is most likely a better start-to-finish solution than what I was attempting.

Answer 1

Naively,

JSON.parse(str.replace(/"/g,'"'));

will work, but you should figure out why your double quotes are getting turned into HTML entities.

Answer 2

Description

This will allow for the numerical ascii character of any character. However, if you only have quotations to remove it isn't too much to run a replace.

 var str = "[["2016-11-17",771.22998],["2016-11-16",764.47998],["2016-11-15",758.48999],["2016-11-14",736.080017],["2016-11-11",754.02002],["2016-11-10",762.559998],["2016-11-09",785.309998],["2016-11-08",790.51001],["2016-11-07",782.52002],["2016-11-04",762.02002],["2016-11-03",762.130005],["2016-11-02",768.700012],["2016-11-01",783.609985],["2016-10-31",784.539978]]"; // regex to get the ascii number var r = /\\&#(\\d\\d);/gi; // replaces each numerical ascii character with their character representation str = str.replace(r, function (match, grp) { return String.fromCharCode(parseInt(grp)); } ); console.log(JSON.parse(str)); 

Answer 3

Try to decode your encoded string reusing the HTML parser in something more portable, a lot faster, reusable. regex patterns are specific to the current problem and each time you encounter e different character you'll have write and rewrite a new pattern. I use an encapsulated function method similar to this:

function htmlParse( x ) {
     var c = document.createElement("div");
         c.innerHTML = x;
  return c.innerText;       
 };

Now let's decode your retrieved string...

var str = "[["2016-11-17",771.22998],["2016-11-16",764.47998],["2016-11-15",758.48999],["2016-11-14",736.080017],["2016-11-11",754.02002],["2016-11-10",762.559998],["2016-11-09",785.309998],["2016-11-08",790.51001],["2016-11-07",782.52002],["2016-11-04",762.02002],["2016-11-03",762.130005],["2016-11-02",768.700012],["2016-11-01",783.609985],["2016-10-31",784.539978]]";

|>>

var decoded = htmlParse( str );
console.log( decoded );

and see if parsing with json succeeds

var arr = JSON.parse( decoded );
console.log( arr );

and here is the snippet...

  var str = "[["2016-11-17",771.22998],["2016-11-16",764.47998],["2016-11-15",758.48999],["2016-11-14",736.080017],["2016-11-11",754.02002],["2016-11-10",762.559998],["2016-11-09",785.309998],["2016-11-08",790.51001],["2016-11-07",782.52002],["2016-11-04",762.02002],["2016-11-03",762.130005],["2016-11-02",768.700012],["2016-11-01",783.609985],["2016-10-31",784.539978]]"; var decoded = htmlParse(str); console.log(decoded); var arr = JSON.parse(decoded); console.log(arr); function htmlParse(x) { var c = document.createElement("div"); c.innerHTML = x; return c.innerText; }; 

Answer 4

If using the json package to write the data, set the ensure_ascii argument to false.

with open('output.json', 'w', encoding='utf-8') as f:
    json.dump(data, f, ensure_ascii=False)

For Python2.x, use the codecs library to set the encoding of your output file when you open it.