Answer
Uses System.Text.Json by default.
- High performance
- Supports converters and casing rules
- Can switch to Newtonsoft.Json if required
Quick Answer
ASP.NET Core uses System.Text.Json by default (fast, low-allocation). Configure globally in AddControllers(options => ...). Options: JsonNamingPolicy.CamelCase, ReferenceHandler.Preserve for circular refs, custom converters for types like DateOnly. Newtonsoft.Json (AddNewtonsoftJson()) is optional for backwards compatibility. Use [JsonPropertyName("name")] to customize JSON property names per class.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ