Function: extractJson()

extractJson(rawText): string | null

Defined in: packages/agentos/src/core/validation/extractJson.ts:35

Extract JSON from raw LLM output text.

Tries multiple extraction strategies in priority order:

1. Raw JSON (entire string is valid JSON)
2. Markdown fenced blocks (json ... or ...)
3. Strip <thinking> blocks, then retry
4. First {...} or [...] via greedy brace/bracket matching
5. JSONL (multiple JSON objects on separate lines → array)

Parameters

rawText

string

Raw LLM output that may contain JSON

Returns

string | null

Extracted JSON string, or null if no valid JSON found

Example

extractJson('```json\n{"key": "value"}\n```') // '{"key": "value"}'
extractJson('<thinking>hmm</thinking>\n{"a":1}') // '{"a":1}'
extractJson('no json here') // null