Unverified50% confidenceFactExact time
Ollama has supported making models output strictly according to a JSON Schema via the format field in the request since around version 0.1.30.
1
Sources
50%
Confidence
Long-term
Relevance
10/18/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedOllama's structured output typically relies at its core on llama.cpp's grammar-constrained decoding, restricting the model at the decoding level to generate only tokens that conform to JSON syntax and schema constraints.66% similarUnverifiedDifferent models adhere to JSON Schema to varying degrees and may omit required fields, write numbers as strings, change key names in nested objects, or return explanatory text instead of JSON.66% similarUnverifiedBy instructing the model to return JSON format and then parsing it with json.loads, free-form LLM text can be converted into structured data consumable by programs.65% similarUnverifiedVersion 2.0.61 fixes the range of JSON Schema dialects and annotations accepted by workflow tools, making it compatible with more mainstream JSON Schema writing styles (commit 758b092)65% similarUnverifiedBy forcing the model to answer using a single tool, you can obtain JSON output that conforms to a schema rather than free-form text that needs to be parsed manually.65% similar
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