CODEWITHSUNDEEP
c#jsonasp.net-web-api2
asahun
asahun

Reputation: 195

Validating JSON before it gets deserialized in asp.net web api

I want to validate the json input before it gets deserialised to my objects

Example:

{"ID": ["1234"]}, is valid = and gets deserialised to my POCO class

{"ID": ["1234" , is not a valid JSON and I want to throw an error

I want to throw an error but right now Web API gracefully handling it and deserialising to the appropriate class. Is there anyway I can intercept the conversion and validate the the Input json before it reaches my controller?

Upvotes: 2

Views: 5029

Answers (2)

PeonProgrammer
PeonProgrammer

Reputation: 1535

I simple check at the beginning of a controller's method:

if (!Model.IsValid(ModelName))
{
    //handle error
}
else
{
    //continue 
}

Upvotes: 2

Nicholas Carey
Nicholas Carey

Reputation: 74365

The only way to know whether or not your text is valid JSON or not is to try and parse it. If the parser throws an exception, it's not valid JSON. See How to make sure that string is Valid JSON using JSON.NET).

If you are using NewtonSoft's Json.Net, you can validate your JSON against a schema so you know you've got

  • Valid JSON, that is
  • In the format you expect

See

for details.

Upvotes: 1

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