If I defined an object in JS with:
var j={"name":"binchen"};
How can I convert the object to JSON? The output string should be:
'{"name":"binchen"}'
转载于:https://stackoverflow.com/questions/4162749/convert-js-object-to-json-string
All current browsers have native JSON support built in. So as long as you're not dealing with prehistoric browsers like IE6/7 you can do it just as easily as that:
var j={"name":"binchen"};
JSON.stringify(j); // '{"name":"binchen"}'
With JSON.stringify() found in json2.js or native in most modern browsers.
JSON.stringify(value, replacer, space) value any JavaScript value, usually an object or array. replacer an optional parameter that determines how object values are stringified for objects. It can be a function or an array of strings. space an optional parameter that specifies the indentation of nested structures. If it is omitted, the text will be packed without extra whitespace. If it is a number, it will specify the number of spaces to indent at each level. If it is a string (such as '\t' or ' '), it contains the characters used to indent at each level. This method produces a JSON text from a JavaScript value.
Check out updated/better way:
Update May 17, 2008: Small sanitizer added to the toObject-method. Now toObject() will not eval() the string if it finds any malicious code in it.For even more security: Don't set the includeFunctions flag to true.
Douglas Crockford, father of the JSON concept, wrote one of the first stringifiers for JavaScript. Later Steve Yen at Trim Path wrote a nice improved version which I have used for some time. It's my changes to Steve's version that I'd like to share with you. Basically they stemmed from my wish to make the stringifier:
• handle and restore cyclical references • include the JavaScript code for functions/methods (as an option) • exclude object members from Object.prototype if needed.
if you have a json string and it's not wrapped with [] then wrap it up first
var str = '{"city": "Tampa", "state": "Florida"}, {"city": "Charlotte", "state": "North Carolina"}';
str = '[' + str + ']';
var jsonobj = $.parseJSON(str);
OR
var jsonobj = eval('(' + str + ')');
console.log(jsonobj);
JSON.stringify({"key":"value"});
If you're using AngularJS, the 'json' filter should do it:
<span>{{someObject | json}}</span>
One custom defined for this , until we do strange from stringify method
var j={"name":"binchen","class":"awesome"};
var dq='"';
var json="{";
var last=Object.keys(j).length;
var count=0;
for(x in j)
{
json += dq+x+dq+":"+dq+j[x]+dq;
count++;
if(count<last)
json +=",";
}
json+="}";
document.write(json);
OUTPUT
{"name":"binchen","class":"awesome"}
Json Stringify can convert your js object to json
var x = {"name" : "name1"};
JSON.stringify(x);
You can use JSON.stringify() method to convert JSON object to String.
var j={"name":"binchen"};
JSON.stringify(j)
For reverse process, you can use JSON.parse() method to convert JSON String to JSON Object.
In angularJS
angular.toJson(obj, pretty);
obj: Input to be serialized into JSON.
pretty(optional):
If set to true, the JSON output will contain newlines and whitespace. If set to an integer, the JSON output will contain that many spaces per indentation.
(default: 2)
var someObj = { "name" : "some name" };
var someObjStr = JSON.stringify(someObj);
console.log( someObjStr );
I was having issues with stringify running out of memory and other solutions didnt seem to work (at least I couldn't get them to work) which is when I stumbled on this thread. Thanks to Rohit Kumar I just iterate through my very large JSON object to stop it from crashing
var j = MyObject;
var myObjectStringify = "{\"MyObject\":[";
var last = j.length
var count = 0;
for (x in j) {
MyObjectStringify += JSON.stringify(j[x]);
count++;
if (count < last)
MyObjectStringify += ",";
}
MyObjectStringify += "]}";
MyObjectStringify would give you your string representaion (just as mentioned other times in this thread) except if you have a large object, this should also work - just make sure you build it to fit your needs - I needed it to have a name than array
you can use native stringify function like this
const j={ "name": "binchen" }
/** convert json to string */
const jsonString = JSON.stringify(j)
console.log(jsonString) // {"name":"binchen"}</div>
JSON.stringify(j,null,4) would give you beautified JSON in case you need beautification also
Woking... Easy to use
$("form").submit(function(evt){
evt.preventDefault();
var formData = $("form").serializeArray(); // Create array of object
var jsonConvert = JSON.stringify(formData); // Convert to json
});
Thanks
Just Copy and pase
$("form").submit(function(evt){
evt.preventDefault();
var formData = $("form").serializeArray(); // Create array of object
var jsonConvertedData = JSON.stringify(formData); // Convert to json
});
if you want to get json properties value in string format use the following way
var i = {"x":1}
var j = JSON.stringify(i.x);
var k = JSON.stringify(i);
console.log(j);
"1"
console.log(k);
'{"x":1}'
JSON.stringify turns a Javascript object into JSON text and stores that JSON text in a string.
The conversion is an Object to String
JSON.parse turns a string of JSON text into a Javascript object.
The conversion is a String to Object
var j={"name":"binchen"};
to make it a JSON String following could be used.
JSON.stringify({"key":"value"});
JSON.stringify({"name":"binchen"});
For more info you can refer to this link below.
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
const obj = { "name":"xxx", "city":"York"};
const myJSON = JSON.stringify(obj);
console.log(myJSON);</div>
define object
let obj = {
"firstname" : "Hello",
"lastname" : "javascript"
};
then convert it to string using this code
strObj= JSON.stringify(obj);
to make sure console the result
console.log(strObj);
All you need is to add this code belowvar j={"name":"binchen"}; JSON.stringify(j); // '{"name":"binchen"}'
For debugging in Node JS you can use util.inspect(). It works better with circular references.
var util = require('util');
var j = {name: "binchen"};
console.log(util.inspect(j));
you can use JSON.stringify() function to do that.
The existing JSON replacements where too much for me, so I wrote my own function. This seems to work, but I might have missed several edge cases (that don't occur in my project). And will probably not work for any pre-existing objects, only for self-made data.
function simpleJSONstringify(obj) {
var prop, str, val,
isArray = obj instanceof Array;
if (typeof obj !== "object") return false;
str = isArray ? "[" : "{";
function quote(str) {
if (typeof str !== "string") str = str.toString();
return str.match(/^\".*\"$/) ? str : '"' + str.replace(/"/g, '\\"') + '"'
}
for (prop in obj) {
if (!isArray) {
// quote property
str += quote(prop) + ": ";
}
// quote value
val = obj[prop];
str += typeof val === "object" ? simpleJSONstringify(val) : quote(val);
str += ", ";
}
// Remove last colon, close bracket
str = str.substr(0, str.length - 2) + ( isArray ? "]" : "}" );
return str;
}
What you want is :
var yourObject = {a : "string", b : 2 };
Json.Stringify(yourObject);
Either way if you want a pretty print you should check: How can I pretty-print JSON using JavaScript?
So in order to convert a js object to JSON String:
The simple syntax for converting an object to a string is
JSON.stringify(value)
The full syntax is: JSON.stringify(value[, replacer[, space]])
Let’s see some simple examples. Note that the whole string gets double quotes and all the data in the string gets escaped if needed.
JSON.stringify("foo bar"); // ""foo bar""
JSON.stringify(["foo", "bar"]); // "["foo","bar"]"
JSON.stringify({}); // '{}'
JSON.stringify({'foo':true, 'baz':false}); /* "
{"foo":true,"baz":false}" */
const obj = { "property1":"value1", "property2":"value2"};
const JSON_response = JSON.stringify(obj);
console.log(JSON_response);/*"{ "property1":"value1",
"property2":"value2"}"*/