"With Fluent Assertions, the assertions look beautiful, natural and most importantly, extremely readable" (by Girish)

• See www.fluentassertions.com for more information about the main library.
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Available extension methods

• BeEquivalentTo()
• ContainSingleElement()
• ContainSubtree()
• HaveCount()
• HaveElement()
• HaveValue()
• MatchRegex()
• NotBeEquivalentTo()
• NotHaveElement()
• NotHaveValue()
• NotMatchRegex()

See "in-code" description for more information.

Usage

Be sure to include using FluentAssertions.Json; otherwise false positives may occur.

using FluentAssertions;
using FluentAssertions.Json;
using Newtonsoft.Json.Linq;

... 
var actual = JToken.Parse(@"{ ""key1"" : ""value"" }");
var expected = JToken.Parse(@"{ ""key2"" : ""value"" }");
actual.Should().BeEquivalentTo(expected);

You can also use IJsonAssertionOptions<> with Should().BeEquivalentTo() assertions, which contains helper methods that you can use to specify the way you want to compare specific data types.

Example:

using FluentAssertions;
using FluentAssertions.Json;
using Newtonsoft.Json.Linq;

... 
var actual = JToken.Parse(@"{ ""value"" : 1.5 }");
var expected = JToken.Parse(@"{ ""value"" : 1.4 }");
actual.Should().BeEquivalentTo(expected, options => options
                .Using<double>(d => d.Subject.Should().BeApproximately(d.Expectation, 0.1))
                .WhenTypeIs<double>());

Also, there is WithoutStrictOrdering() which allows you to compare JSON arrays while ignoring the order of their elements. This is useful when the sequence of items is not important for your test scenario. When applied, assertions like BeEquivalentTo() will succeed as long as the arrays contain the same elements, regardless of their order.

Example:

using FluentAssertions;
using FluentAssertions.Json;
using Newtonsoft.Json.Linq;

...
var actual = JToken.Parse(@"{ ""array"" : [1, 2, 3] }");
var expected = JToken.Parse(@"{ ""array"" : [3, 2, 1] }");
actual.Should().BeEquivalentTo(expected, options => options
                .WithoutStrictOrdering());