string to array - javascript

Question

I am reading the plain text file in node.js using ajax call from client side.

Result : success gives the result as below.

 ""[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n""

After parsing the above result :

   JSON.parse(result);

  "[{"x":233,"y":279,"count":1},{"x":256,"y":243,"count":6}] [{"x":233,"y":279,"count":1},{"x":256,"y":243,"count":6}] "

I want to change this string to array of objects,

Expected Result is array of objects:

   [{"x":233,"y":279,"count":1},{"x":256,"y":243,"count":6},
    {"x":233,"y":279,"count":1},{"x":256,"y":243,"count":6}
   ]

Ajax call Code

$.ajax({
        url: document.URL + "getData",
        method : "GET",
        success: function (result) {
            var info = JSON.parse(result);
            var object = JSON.parse(info);
            console.log(object);

        }
});

Any idea will be helpful.

can you just make the file node.json and just store the json, and use ajax to call it??? — Jeff Lee
– Jeff Lee, Commented Jun 7, 2013 at 8:00
@JeffLee I am working only on retrieval part, No write permission — karthick
– karthick, Commented Jun 7, 2013 at 8:01

Michael Geary · Accepted Answer · 2013-06-07 08:18:42Z

2

That is some seriously messed-up JSON. There's an extra quote mark at each end, and ]\n[ in the middle where there should be a ,.

You really should fix your server to generate valid JSON, but if you can't, you could tweak it like this:

var res = '"[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n"';

var resfix = res.replace( /^"|"$/g, '' ).replace( ']\n[', ',' );

JSON.parse( resfix );

I changed the extra set of quotes at the very outside of your var res = string to make it a valid JavaScript string for testing.

edited Jun 7, 2013 at 8:18

answered Jun 7, 2013 at 8:08

Michael Geary

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5 Comments

Alnitak Over a year ago

that first var res line copied from the OP isn't legal. If the enclosing double quotes aren't really there then the first .replace() is unnecessary.

Alnitak Over a year ago

@karthick.k I don't see how that can work when the var res you've supplied isn't even legal JS.

Michael Geary Over a year ago

@Alnitak - good catch, thanks. I'd changed the outermost " to ' in my test case but forgot to copy it over to the answer that way.

Alnitak Over a year ago

@MichaelGeary it's unclear whether the outer double quotes the OP put in the question ever even existed.

Michael Geary Over a year ago

@Alnitak - True, but the code I posted would work the same with or without them.

Alnitak · Accepted Answer · 2013-06-07 08:08:44Z

2

It looks to me like you've simply got double-encoded JSON. Just run it through JSON.parse() a second time.

EDIT actually, that's not quite right - the output contains two JS arrays, with a \n separator and no enclosing array. You will have to manipulate the data a bit (looking at that now) to make it parseable a second time.

EDIT2 This appears to work, albeit that your current var res line includes an extra pair of surrounding quotes that aren't legal so in this test I've removed them:

var res =  "[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n[{\"x\":233,\"y\":279,\"count\":1},{\"x\":256,\"y\":243,\"count\":6}]\n"

var out = JSON.parse(res.replace(/]\s*\[/g, ','));

edited Jun 7, 2013 at 8:08

answered Jun 7, 2013 at 8:02

Alnitak

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2 Comments

karthick Over a year ago

SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data while second time parsing

Alnitak Over a year ago

@Swift you're wrong - I did realise it, but the OP wanted the objects from the two arrays to be merged into a single array.

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