Can json have null values?

Yes, JSON fully supports null as a valid data type representing the intentional absence of a value. Null is written as the literal keyword "null" without quotes in JSON. For example, {"name": null} is perfectly valid JSON. Null differs from undefined, empty strings, or zero—it explicitly indicates a missing or unknown value. Using null is preferable to omitting keys entirely when you want to indicate that a property exists but currently has no value. Many APIs use null to represent optional fields that have not been set. When parsing JSON in programming languages, null typically maps to their native null or nil values. Be cautious with null values in strict type systems and always check for null before accessing nested properties to avoid runtime errors.