Five options:
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Use the free jsonutils web tool without installing anything.
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If you have Web Essentials in Visual Studio, use Edit > Paste special > paste JSON as class.
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Use the free jsonclassgenerator.exe
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The web tool app.quicktype.io does not require installing anything.
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The web tool json2csharp also does not require installing anything.
Pros and Cons:
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jsonclassgenerator converts to PascalCase but the others do not.
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app.quicktype.io has some logic to recognize dictionaries and handle JSON properties whose names are invalid c# identifiers.