Use Ollama JSON mode (format: "json") and avoid the infinite-whitespace failure
domain: ollama.com · 4 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
POST /api/generate (or /api/chat) with "format": "json" to force the output to be a well-formed JSON object.
Also instruct the model in the prompt itself to respond using JSON (e.g. end the prompt with 'Respond using JSON').
With stream:false, read the response field and json.loads it — it will be a syntactically valid JSON object.
For a fixed shape, prefer passing a JSON schema object in format (structured outputs) over bare "json" mode.
Known gotchas
If the prompt does not ask for JSON, the model may generate large amounts of whitespace (the grammar allows whitespace forever) — this is the documented failure mode of JSON mode.
format:"json" guarantees syntax only; key names and value types are unconstrained — use a schema in format when you need a specific shape.
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