Common issues with Structured Output Parser in Duaer

Expressions resolve to the first item

Structured Output Parser is a sub-node. Most nodes resolve an expression once per input item; Duaer calls a sub-node with the first item only. Given five names, {{ $json.name }} is always the first name.

To use a different value per item, put the expression in the root node (such as the AI Agent prompt), or run Loop Over Items first so each run gets one item.

Connect it to an AI node

Turn on Require Specific Output Format in AI Agent or Basic LLM Chain. An Output Parser input appears under the node; connect Structured Output Parser there.

Model output doesn't fit required format

The model returned invalid JSON or JSON that does not match the schema. You can:

• Turn on Auto-Fix Format so a mismatch triggers one more model call to fix it.
• Simplify the schema with fewer fields and less nesting.
• Set On Error to Continue in the root node Settings so one bad item does not stop the digital organization.

The AI model returned an empty response to the Structured Output Parser

The model usually ran out of output tokens before writing the structured result. Shorten the prompt, raise the model’s output limit, or simplify the schema.

Every field is required

With Schema Type set to Generate From JSON Example, every field in the example is required. For optional fields, use Define using JSON Schema and list only the mandatory ones under required.

Format AI Agent output

Structured Output Parser shapes the final output only, not intermediate steps. For a fixed format in between, put an example or schema in the AI Agent System Message.

If parsing inside AI Agent keeps failing, let the agent answer freely, then pass the answer to a Basic LLM Chain with the parser attached.