CODEWITHSUNDEEP
c#json
Ankit Kumar
Ankit Kumar

Reputation: 514

How to validate extra key in the Json Schema in C# and throw error

So I have two Json files where I am validating them and If one file has extra key, I would like to throw an error. Right now with my below code, it does not give me any error, it takes the extra key with it, though I get an error if a key is missing but not if I have an extra key.

My piece of code is as follows:

async Task<JsonSchema> GetDataSchemaAsync( string format )
    {
        if( string.IsNullOrWhiteSpace( format ) )
            throw new ArgumentException( "Table data format is invalid" );

        var schemaUri = new Uri( _schemaBaseUri, $"{format}.json");
        using var client = new WebClient();
        var json = client.DownloadString( schemaUri );

        return await JsonSchema.FromJsonAsync( json );
    }

  var schema = await GetDataSchemaAsync( format ); 
  var data = JsonConvert.DeserializeObject<JObject>(line);
  var errors = validator.Validate(data, schema);

My format file has the schema with keys mentioned and my line is my json format with values and an extra key.

Please advise.

Upvotes: 0

Views: 344

Answers (1)

derpirscher
derpirscher

Reputation: 17382

JSON Schema supports the additionalProperties: boolean setting. The default value for this setting is true so additional properties will be allowed during validation. Docs

Set

"additionalProperties": false

in your schema and the validator will throw an error if the dataobject has any properties not defined in the schema.

Upvotes: 1

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