Need a string JSON Validator [duplicate]

Question

I'm using newtonsoft's JSON.Net and loving every minute of it.

However, I am using JObject.Parse(jsonString) to grab a JToken from a response string. If I send invalid JSON, I get an exception. I can catch the exception, but I would like to, be able to test the string first before sending it to Parse.

Maybe something akin to JObject.TryParse() (which doesn't exist).

I'd even take bool ValidJson(string)

I know there's JSONLint out there, but I would really like to keep the external calls to a minimum.

Any ideas?

knocte · Accepted Answer · 2021-03-17 06:37:45Z

5

The simplest solution would be to write a function which calls JObject.Parse and returns false if it throws a Newtonsoft.Json.JsonReaderException.

edited Mar 17, 2021 at 6:37

knocte

18.2k14 gold badges87 silver badges134 bronze badges

answered Aug 1, 2011 at 19:43

MRAB

20.7k6 gold badges44 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Mehdi Dehghani Over a year ago

Return true for this invalid JSON: {A:{"B": 1}}

Community · Accepted Answer · 2019-11-14 13:46:06Z

3

Use JContainer.Parse(str) method to check if the str is a valid Json. If this throws exception then it is not a valid Json.

JObject.Parse - Can be used to check if the string is a valid Json object
JArray.Parse - Can be used to check if the string is a valid Json Array
JContainer.Parse - Can be used to check for both Json object & Array

edited Nov 14, 2019 at 13:46

CommunityBot

11 silver badge

answered Nov 26, 2013 at 13:12

Senthilkumar Viswanathan

8627 silver badges9 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 10:31:32Z

0

A working code snippet

public bool isValidJSON(string json)
{
    try
    {
        JToken token = JObject.Parse(json);
        return true;
    }
    catch(Exception ex)
    {
        return false;
    }
}

Thanks to MRAB

edited May 23, 2017 at 10:31

CommunityBot

11 silver badge

answered Jun 19, 2015 at 7:30

Durai Amuthan.H

32.5k12 gold badges165 silver badges242 bronze badges

2 Comments

Mehdi Dehghani Over a year ago

Return true for this invalid JSON: {A:{"B": 1}}

Trisped Over a year ago

Since this is a C# method, I the name should be Pascal case, so IsValidJson.

Collectives™ on Stack Overflow

Need a string JSON Validator [duplicate]

3 Answers 3

1 Comment

Comments

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

2 Comments

Linked

Related