An alternative method for JSON.stringify()

Question

I want an alternative method for JSON.stringify(). I am using JSON.stringify and I got error like cyclic object value. I don't know how to remove this error so I'd like to know if there's an alternative method.

DCSSPACE.SaveAndOpenJSONWriter = function(canvas) {

    //multiple tab.....
    var mydata = [];
    var area = {}, DCS = {}, workspace = {};
    var len = DCSSPACE.collection.length;
    for (var k = 0; k < len; k++) {
        var result = [];
        var tabid = DCSSPACE.collection.models[k].id;
        var canvas = DCSSPACE.collection.get(tabid).get("workflow");
        //for node
        var figures = canvas.getFigures();
        for (var i = 0; i < figures.getSize(); i++) {
            if (figures.get(i).type == "draw2d.Node") {
                var node = {};

                node.blockType = getBlockType(figures.get(i));
                node.x = figures.get(i).getX();
                node.y = figures.get(i).getY();
                node.id = figures.get(i).getId();
                node.type = figures.get(i).type;
                node.width = figures.get(i).getWidth();
                node.height = figures.get(i).getHeight();
                node.label = figures.get(i).getLabel();
                node.sequenceNo = figures.get(i).getSequenceNo();
            node.model = figures.get(i).model;

                result.push(node);
            }
        }
        //for lines
        var lines = canvas.getLines();
        for (var j = 0; j < lines.getSize(); j++) {
            if (lines.get(j).type == "draw2d.nodeConnetion") {
                var nodeConnection = lines.get(j).getConnectionAttrubutes();

                nodeConnection.source = lines.get(j).getSource();
                nodeConnection.target = lines.get(j).getTarget();
                result.push(nodeConnection);
            }
        }
        area = {
            tabid : tabid,
            attr : result
        };

        mydata.push(area);
        result=[];
        workspace = {
            DCS : mydata
        };
    }
    //console.log(mydata);
    var arr = JSON.stringify(workspace, null, 4);
    console.log(arr);
    DCSSPACE.SaveAndLoadFigure = result;

    return workspace;

};

Can you replicate this in a Fiddle or at least include the error message in the question? — David Hellsing
– David Hellsing, Commented Dec 19, 2013 at 8:29
The error message means that you have a reference to the object itself, which would create an infinite loop when trying to stringify it. Find which key holds the reference, remove it, and you're good to go. — JJJ
– JJJ, Commented Dec 19, 2013 at 8:31
var arr = JSON.stringify(workspace, null, 4) you only use this for read the json? But console.log can read a object... and show you the structure... You can use console.log(workspace) and read the response tree in the console... — Frogmouth
– Frogmouth, Commented Dec 19, 2013 at 8:34

Frogmouth · Accepted Answer · 2014-04-04 16:49:58Z

If won't to use stringify you can reproduce it, like this:

OBJtoString(object [,n]) accempt 2 args:

object (needed) the object you need to log (in my release array and object is the same)

n numbero of space that indent every new line inside object aruments.

var OBJtoString = function(_o,_m,_rf,_dep,_res){
    _dep = [],
    _rf = function(obj,n,_n,_a,_k,_i,_ws,_f,_e){
        if(typeof obj != "object") return false;
        if(typeof _a === "undefined") _a = "FIRST PARENT OBJECT";
        _dep.push(obj),
        _f = (_dep.length < 1) ? function(){} : function(_z,_x){
            for(_x = 0; _x <= _dep.length; _x++){
                if(obj[_z] == _dep[_x]) return true;
            }
            return false;
        }
        _ws = "";
        if(typeof n === "undefined") n = 1;
        if(typeof _n === "undefined") _n = n;
        for(_k = 0; _k <= n; _k++){
            _ws += " ";
        }
        var response ="{ \n";
        for(var _i in obj){
            if(typeof obj[_i] !== "object"){
            if(typeof obj[_i] === "string") obj[_i] = "'"+obj[_i].toString()+"'";
            if(typeof obj[_i] === "boolean") obj[_i] = obj[_i].toString() + " (boolean)";
            response += _ws + _i + " : " + obj[_i].toString();
            response += "\n";
            continue;
        }
            response += (_f(_i)) ? _ws + _i + " : "+ _a +" (prevent loop)\n" : _ws + _i + " : " + _rf(obj[_i],n+_n,_n,_a);
        }
    if(_n != n) response += _ws;
    return response +="} \n";
    }
_res = _rf(_o,_m);
_dep = [];
return _res;
 }

Uses Example:

var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
console.log(OBJtoString(example,4));

return:

 { 
     ciao : 'hellow'
     saluto : { 
          ciao : 'ciao'
          dam : true (boolean)
     }
     parentObj : FIRST PARENT OBJECT (prevent loop)
}

Other Example:

var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
example.f = {
    g : example
}
console.log(OBJtoString(example,4));

Return:

{ 
     ciao : 'hellow'
     saluto : { 
         ciao : 'ciao'
         dam : true (boolean)
         } 
     parentObj : FIRST PARENT OBJECT (prevent loop)
     f : { 
         g : FIRST PARENT OBJECT (prevent loop)
         } 
}

This technique would still have a problem with cyclic structures, just like the native impls.
code UPDATE to prevent loop when the object has itself like a prop. take a look... solve the problem?

user08152017 · Accepted Answer · 2022-10-04 14:27:28Z

1

I found util.inspect() pretty helpful.

You can print entire object console.log(util.inspect(myObj))

Or with optional arguments util.inspect(object, showHidden=false, depth=2, colorize=true)

Documentation: https://nodejs.org/en/knowledge/getting-started/how-to-use-util-inspect/

edited Oct 4, 2022 at 14:27

answered Oct 4, 2022 at 12:45

user08152017

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