Parse a JSON string

Question

I have a JSON string like following string

{
    FlightId : 1,
    [
        {
            AirplaneId : 1
        },
        {
            AirplaneId : 2
        }
    ]
}

I have defined 2 classes to convert this JSON string to the objects of these 2 classes :

class Airplane
{
    int AirplaneId;
}

class Flight
{
    int FlightId;
    List<Airplane> Airplanes;
}

During convert the string to these classes objects I get an error. The error tells me that JSON string is not recognized and I should define a name for the list in my JSON string. I can not change the JSON string , how to define my class to convert this JSON String

Could you edit your question to show us the code you're using to deserialize the JSON string, along with the precise error message? — Richard Ev
– Richard Ev, Commented Feb 24, 2015 at 13:11
"I have a JSON string like following..." No, you don't. You have something that looks like JSON, but isn't. Thus, you cannot use a JSON deserializer to parse it. — Heinzi
– Heinzi, Commented Feb 24, 2015 at 13:15

Omri Aharon · Accepted Answer · 2015-02-24 13:14:15Z

3

Yes, you get an error since that is not a valid JSON.

In order to make it valid, you need to have a key to match your list value:

{
    "FlightId" : 1,
    "Airplanes": [
        {
            "AirplaneId" : 1
        },
        {
            "AirplaneId" : 2
        }
    ]
}

Also, you need to wrap your key values in quotes.

You can use https://www.jsoneditoronline.org/ in the future to make sure your JSON strings are valid.

answered Feb 24, 2015 at 13:14

Omri Aharon

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3 Comments

Ali Foroughi Over a year ago

I talk to my JSON String provider service and they believe they gave me a standard JSON string. What do you think ?!

Omri Aharon Over a year ago

@AliForoughi I think either they are wrong and they don't know what JSON is, or that you pasted a non string by accident (ordered descending by likelihood).

BendEg Over a year ago

@AliForoughi if you are sure, you don't make any copy paste errors, send them a JSON specification. That's all

BendEg · Accepted Answer · 2015-02-24 13:13:47Z

1

The problem is your array, you need to define a key for it, like:

{
    "FlightId" : 1,
    "Airplanes": [
        {
            "AirplaneId" : 1
        },
        {
            "AirplaneId" : 2
        }
    ]
}

Airplanes must be a list in your class later.

JSON is a "Key-Value" based format, so every value (even arrays) needs a key.

answered Feb 24, 2015 at 13:13

BendEg

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