JSON

Includes writable JSON DOM and lots of commonly used JSON converters.

In Trivial.Text namespace of Trivial.dll library.

JSON DOM

You can create a writable JSON DOM including JSON object JsonObjectNode and JSON array JsonArrayNode.

var json = new JsonObjectNode
{
    { "prop-a", 1234 }, // Add property with name and value
    { "prop-b", "opq" }, // Add another property
    { "prop-c", true },
    { "prop-d", new JsonArrayNode { 5678, "rst" } }
};

You can also get or set the property of JSON object as you want.

// Get the count of properties.
var num = json.Count; // 4
num = json.Keys.Count; // 4

// Get a property in different way.
var num = json.GetInt32Value("prop-a"); // 1234
num = json.GetValue<int>("prop-a"); // 1234
num = json.TryGetInt32Value("prop-a") ?? 0; // 1234

// Get a property and convert to another type.
var numStr = json.GetStringValue("prop-a"); // "1234"
numStr = json.GetValue<string>("prop-a"); // "1234"
numStr = json.TryGetStringValue("prop-a"); // "1234"

// Test if exists.
var has = json.ContainsKey("prop-a"); // true
has = json.ContainsKey("non-exist"); // false
var kind = json.GetValueKind("prop-a"); // JsonValueKind.Number

// Add a property.
json.SetValue("prop-e", "uvw");
numStr = json.GetValue<string>("prop-e"); // "uvw"

// Override a property.
json.SetValue("prop-a", 5678);
num = json.GetValue<int>("prop-a"); // 5678

// Remove a property
json.Remove("prop-e");
has = json.ContainsKey("prop-e"); // false

At last, you can write to an instance of System.Text.Json.Utf8JsonWriter by WriteTo member method or get the JSON format string by ToString member method.

var jsonStr = json.ToString(IndentStyles.Compact); // "{\"prop-a\":5678,…}"

JSON access in thread-safe

For scenarios of concurrency, you can enable thread-safe mode.

json.EnableThreadSafeMode();

JSON switch

If the JSON node is in different value kinds in different cases, you can

• call Switch extension method to get the instance to configure routes to handle these cases, or
• call SwitchValue method for a specific JSON object property.

These methods return the JsonSwitchContext instance of the specific JSON node or property value. The instance has Case, Config, Default and other related methods used to configure predicate and callback handlers of routes.

json.SwitchValue("prop-a")
    .Case<string>(s => { /* not matched */ })
    .Case<int>(i => { /* matched and i == 5678 */ })
    .Default(() => { /* not matched */ });
json.SwitchValue("prop-b")
    .Case("uvw", () => { /* not matched */ })
    .Case("opq", () => { /* matched */ })
    .Default(() => { /* not matched */ });
json.SwitchValue("prop-c")
    .Case("uvw", () => { /* not matched */ })
    .Default(node => { /* matched and node == JsonBooleanNode.True */ });
json.SwitchValue("prop-d")
    .Case(node => node is JsonArrayNode arr && arr.Length == 2, node => { /* matched and node is the JsonArrayNode */ })
     .Default(node => { /* not matched */ });

JSON converters

Includes a lot of useful JSON converters so that you can use System.Text.Json.Serialization.JsonConvertAttribute attribute to use for member properties of the model.

Following are date time related.

Converter	.NET type	JSON value kind (serialize/deserialize)	Additional JSON value kind (deserialize only)	Nullable
JsonJavaScriptTicksConverter	DateTime	JavaScript ticks number	Date JSON string	×
JsonJavaScriptTicksConverter.NullableConverter	DateTime?	JavaScript ticks number	Date JSON string	√
JsonJavaScriptTicksConverter.FallbackConverter	DateTime	Date JSON string	JavaScript ticks number	×
JsonJavaScriptTicksConverter.FallbackNullableConverter	DateTime?	Date JSON string	JavaScript ticks number	√
JsonUnixTimestampConverter	DateTime	Unix timestamp number	Date JSON string	×
JsonUnixTimestampConverter.NullableConverter	DateTime?	Unix timestamp number	Date JSON string	√
JsonUnixTimestampConverter.FallbackConverter	DateTime	Date JSON string	Unix timestamp number	×
JsonUnixTimestampConverter.FallbackNullableConverter	DateTime?	Date JSON string	Unix timestamp number	√

Following are number related.

Converter	.NET type	JSON value kind (serialize/deserialize)	Additional JSON value kind (deserialize only)	Nullable
JsonNumberConverter	number types	number	number string	√
JsonNumberConverter.NumberStringConverter	number types	number string	number	√
JsonNumberConverter.StrictConverter	number types	number	number string	×

Following are string collection related.

Converter	.NET type	JSON value kind	Nullable
JsonStringListConverter	common class of IEnumerable<string>	string or string[]	√
JsonStringListConverter.WhiteSpaceSeparatedConverter	common class of IEnumerable<string>	string or string[]	√
JsonStringListConverter.CommaSeparatedConverter	common class of IEnumerable<string>	string or string[]	√
JsonStringListConverter.SemicolonSeparatedConverter	common class of IEnumerable<string>	string or string[]	√
JsonStringListConverter.VerticalBarSeparatedConverter	common class of IEnumerable<string>	string or string[]	√

Following are others.

Converter	.NET type	JSON value kind	Nullable
JsonObjectNodeConverter	JsonObjectNode or JsonArrayNode	object or array	√

For example.

public class Model
{
    [JsonConverter(typeof(JsonNumberConverter))
    public int Number { get; set; }

    [JsonPropertyName("creation")]
    [JsonConverter(typeof(JsonJavaScriptTicksConverter))
    public DateTime CreationTime { get; set; }

    [JsonConverter(typeof(JsonObjectNodeConverter)]
    public JsonObject Properties { get; set; }
}

Now you can deserialize following JSON.

{
    "number": "1234",
    "creation": 1577628663614,
    "properties": {
        "items": [ 5, 6, 7, "a", "b", "c" ]
        "b": true
    }
}