inserting values in json file nested array elemnts

Question

Iam trying to edit my json file using javascript. My json file code is

{
"contacts": {
    "contact": {
        "info": [
            {
                "id": "0",
                "name": "name",
                "number": "0",
                "email": "email"
            }
        ],
        "messages": [
            {
                "message": [
                    {
                        "-from": "0",
                        "-to": "0",
                        "info": {
                            "id": "0",
                            "name": "name",
                            "number": "0",
                            "email": "email"
                        },
                        "text": [
                            {
                                "subText": {
                                    "-italics": "false",
                                    "-underline": "false"
                                }
                            }
                        ],
                        "file": [
                            {
                                "-size": "0",
                                "-type": "image",
                                "fileInfo": {
                                    "id": "0",
                                    "name": "name",
                                    "number": "0",
                                    "email": "email"
                                }
                            }
                        ]
                    }
                ]
            }
        ]
    }
}
}

I want to set the value of contacts.contact.info.id and i want to put another array in contacts.contact.info. plz help me with the syntax . iam facing problem while creating while creating new element in info array. and tell how to display values of the contacts.contact.info element

One thing the answerers haven't mentioned is that you need to ensure that you use JSON.parse(json) to get your data in a usable format before you update it. — Andy
– Andy, Commented Jun 18, 2014 at 9:37

Elias Van Ootegem · Accepted Answer · 2014-06-18 12:48:12Z

2

Using JavaScript, it's perfectly simple:

var data = {};//your json string here
data.contacts.contact.info[0].id = 'New value here'; //id is in array
data.contacts.contact.info.push('Append this value to info');
//or
data.contacts.contact.info = 'Overwrite current info value';
//get string
console.log(JSON.stringify(data));

That's all. If you want to manually alter the data:

{
"contacts": {
    "contact": {
        "info": [
            {
                "id": "0",//replace with, for example:
                "name": "name",
                "number": "0",
                "email": "email"
            },//add comma, and data below:
            {
                "id": "123",
                "name": "foobar",
                "number": "1"
            },
            "primitives go here, too"
        ],//end array
        "messages": [...

That's all there is to it.
To preserve the pretty-printing, as you requested:

var data = JSON.parse(yourString);
data.contacts.contact.info.push(
    {"id": "7","name": "dg","number": "5454","email": "fsfsf"}
);
data.contacts.contact.info.push(
    {"id": "8","name": "gjhhk","number": "64564","email": "fs54f"}
);
//get pretty string, using spaces for indentation:
console.log(JSON.stringify(data, null, ' '));
//same thing, but using tabs:
console.log(JSON.stringify(data, null, '\t'));

edited Jun 18, 2014 at 12:48

answered Jun 18, 2014 at 9:35

Elias Van Ootegem

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10 Comments

Sandeep Over a year ago

i have stored my json data in file and im fetching it and parsing it using json.parse(); and inserting data using data.contacts.contact.info = 'Overwrite current info value'; but when i use data.contacts.contact.info.push('Append this value to info'); , its not working.

Elias Van Ootegem Over a year ago

@Leftalone: if you do that, then data.contacts.contact.info won't be an array anymore. If you want to add data, use the push method on the array. To replace, consider assigning a new array, to ensure data structure consistency

Sandeep Over a year ago

if i have a array inside a array, how to fetch it.

Elias Van Ootegem Over a year ago

@Leftalone: that's pretty basic: suppose var matrix = [[1,2],[3,4]]; just use 2 indexes: console.log((matrix[0][0] + matrix[0][1]) === matrix[1][0]); will log true, because 1 + 2 === 3

Sandeep Over a year ago

the json.contacts.contact.info.push({data}; method is working only once. if i have two elements in the info array the push thing is not working.

|

user2575725 · Accepted Answer · 2014-06-18 09:42:22Z

1

You may try this:

var json={contacts:{contact:{info:[{id:"0",name:"name",number:"0",email:"email"}],messages:[{message:[{"-from":"0","-to":"0",info:{id:"0",name:"name",number:"0",email:"email"},text:[{subText:{"-italics":"false","-underline":"false"}}],file:[{"-size":"0","-type":"image",fileInfo:{id:"0",name:"name",number:"0",email:"email"}}]}]}]}}};

console.log(json.contacts.contact.info[0]); //access first record

json.contacts.contact.info.push({id:"1",name:"name",number:"1",email:"[email protected]"}); // add new info

console.log(json.contacts.contact.info);

answered Jun 18, 2014 at 9:42

user2575725

3 Comments

Sandeep Over a year ago

hi arvind what to do in case of array in a array, if i have to update contacts.messages.message.info.id .

user2575725 Over a year ago

@Leftalone you may use json.contacts.contact.messages[0].message[0].info.id='new value'

Sandeep Over a year ago

the json.contacts.contact.info.push({data}; method is working only once. if i have two elements in the info array the push thing is not working.

webkit · Accepted Answer · 2014-06-18 09:33:09Z

0

for contacts.contact.info.id :

contacts.contact.info is an array.. so you have to work by index like:

contacts.contact.info[0].id = newID;

to Add to this array:

contacts.contact.info.push(newArrayItem);

hope this answers your questions..

answered Jun 18, 2014 at 9:33

webkit

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