• See www.fluentassertions.com for more information about the main library.
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• BeEquivalentTo()
• ContainSingleElement()
• ContainSubtree()
• HaveCount()
• HaveElement()
• HaveValue()
• MatchRegex()
• NotBeEquivalentTo()
• NotHaveElement()
• NotHaveValue()
• NotMatchRegex()

See "in-code" description for more information.

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);