如何以JSON格式打印给定的数组？

Question

假设我有一个像这样的数组：

{
    MNC:
    [
        {
            instanceId: 'i-0c025b0755f5e3e5d6',
            systemId: 'NWD',
            instanceState: 'running',
            tags: [Array],
            env_type: 'DB_CI_APP'
        }
    ]
}

我想将上述数组以JSON格式打印为

{
    "key": "MNC",
    "value":
    [
        {
            "instanceId": "i-0c025b0755f5e3e5d6"
        }
    ]
}

Answer 1

在JavaScript中，您可以使用JSON.stringify将数组或值转换为JSON格式的字符串。

var x = [{'a': 'b'}];
var b = JSON.stringify(x);
var c = b.substring(1, b.length - 1);
JSON.parse(c);
console.log(c);

Answer 2

您可以通过以下方式做到这一点：

var obj =
{
    MNC:
    [
        {
            instanceId: 'i-0c025b0755f5e3e5d6',
            systemId: 'NWD',
            instanceState: 'running',
            tags: [Array],
            env_type: 'DB_CI_APP'
        }
    ]
};

var newObj = {};

for(var key in obj)
{
    newObj['key'] = key;
    break;
}

newObj.value = obj[newObj['key']];

delete newObj.value[0].systemId;
delete newObj.value[0].instanceState;
delete newObj.value[0].tags;
delete newObj.value[0].env_type;

var yourJSONstr = JSON.stringify(newObj, null, 4);

console.log(yourJSONstr);

或者您也可以通过以下方式做到这一点：

var obj =
{
    MNC:
    [
        {
            instanceId: 'i-0c025b0755f5e3e5d6',
            systemId: 'NWD',
            instanceState: 'running',
            tags: [Array],
            env_type: 'DB_CI_APP'
        }
    ]
};

var newObj = {key: 'MNC', value: obj.MNC};

delete newObj.value[0].systemId;
delete newObj.value[0].instanceState;
delete newObj.value[0].tags;
delete newObj.value[0].env_type;

var yourJSONstr = JSON.stringify(newObj, null, 4);

console.log(yourJSONstr);