Adds support for mapping properties using JSONPath queries with Newtonsoft.Json.

Install the package JsonExts.JsonPath from NuGet or install it from the Package Manager Console:

PM> Install-Package JsonExts.JsonPath

Add [JsonPath(string)] to properties of your model and add [JsonConverter(typeof(JsonPathObjectConverter))] to your model.

Here's an example model:

[JsonConverter(typeof(JsonPathObjectConverter))]
public class Book
{
    [JsonPath("price")]
    public double Price { get; set; }

    [JsonPath("info.author")]
    public string Author { get; set; }

    [JsonPath("info.related[0].title")]
    public string FirstRelatedTitle { get; set; }

    [JsonPath("info.related[*].title")]
    public List<string> RelatedTitles { get; set; }
}

Example JSON being deserialized:

{
    "price": 10.0,
    "info": {
        "title": "Leviathan Wakes",
        "author": "James S. A. Corey",
        "related": [
            { "title": "Caliban's War" },
            { "title": "Abaddon's Gate" },
            { "title": "Cibola Burn" },
            { "title": "Nemesis Games" },
            { "title": "Babylon's Ashes" },
            { "title": "Persepolis Rising" },
            { "title": "Tiamat's Wrath" }
        ]
    }
}

Deserialize the JSON to your model like normal using JsonConvert.DeserializeObject() or a JsonSerializer.

var book = JsonConvert.DeserializeObject<Book>(json);

Alternatively you can leave out the [JsonConverter] attribute on the model and instead specify it when deserializing (or on JsonSerializerSettings).

public class Book 
{
    ...
}

// Add JsonPathObjectConverter to the collection of converters used
var book = JsonConvert.DeserializeObject<Book>(json, new JsonPathObjectConverter())

Serializing book back to JSON again will then result in this:

{
    "price": 10.0,
    "author": "James S. A. Corey",
    "firstRelatedTitle": "Caliban's War",
    "relatedTitles": [
        "Caliban's War", 
        "Abaddon's Gate", 
        "Cibola Burn", 
        "Nemesis Games", 
        "Babylon's Ashes", 
        "Persepolis Rising", 
        "Tiamat's Wrath"
    ]
}

• [JsonConverter]

  • Supported on both regular properties and combined with [JsonPath].

• [DefaultValue]

  • Supported on both regular properties and combined with [JsonPath].

• [JsonIgnore]

  • Only supported on regular properties, not supported combined with [JsonPath].

• [JsonProperty] features supported when combined with [JsonPath]:

  • ItemConverterType
  • NullValueHandling
  • DefaultValueHandling
  • NamingStrategyType
  • MissingMemberHandling
  • ReferenceLoopHandling
  • ObjectCreationHandling
  • TypeNameHandling
  • Required