Structured Output: How Engines Force Valid JSON, Token by Token
How vLLM and SGLang guarantee valid JSON or a grammar: compiling a schema into a token mask, applying it at every step, and what it costs in latency and quality.
json
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How vLLM and SGLang guarantee valid JSON or a grammar: compiling a schema into a token mask, applying it at every step, and what it costs in latency and quality.