system.text.json

Issues with System.Text.Json serializing Unicode characters (like emojis)

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I am upgrading an application from .NET Core 2.2 to .NET Core 3.0, and the new System.Text.Json serializer is not behaving the same as Newtonsoft did in 2.2. On characters like a non-breaking-space (u00A0) or emoji characters, Newtonsoft (and even Utf8Json) serialize them as their actual characters, not the Unicode code.