Unverified50% confidenceFactExact time
The Go standard library encoding/json's DisallowUnknownFields() is a strict-mode option that causes decoding to return an error rather than silently ignoring fields when the JSON input contains fields not defined in the target struct.
1
Sources
50%
Confidence
Long-term
Relevance
10/11/2026
First Seen
Sources
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Related Claims
UnverifiedThe Go standard decoder by default consumes only the first complete JSON value without reporting an error; a second decode pass is needed to catch trailing JSON values, and if any value can be decoded from the remaining bytes, it is treated as a format violation.76% similarUnverifiedJSON Mode only guarantees that the output is valid JSON without constraining the field structure; Structured Outputs enforces output conforming to a predefined JSON Schema at the syntactic level by applying a finite state machine (FSM) to constrain the token sampling path during the decoding phase.72% similarUnverifiedStructured output constrains format via JSON Schema, which can eliminate randomness at the format level and confine uncertainty to the scope of semantic content.71% similarUnverifiedEven when using structured output interfaces, occasional format drift or missing fields from the model still occur, and production environments typically require adding JSON validation and exception fallback mechanisms.71% similarVerifiedSetting additionalProperties: false in a JSON Schema rejects any extra fields not explicitly declared in the schema, eliminating the possibility of the model inventing additional fields.70% similar
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