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Structured Output Builder

Define output fields, generate a small JSON Schema contract, and validate a sample response before connecting it to your application.

Use the tool ↓
  1. Define the fields
  2. Generate the schema
  3. Validate a response
Free · Works in your browserYour pasted text is not sent or saved. This tool stays local-only; refreshing clears it.
1 / Your inputs

Set up your calculation

Example values are filled in where useful. Replace them with your own.

Generates a configuration fragment, not a complete API request. Check exact model support.

Types: string, number, integer, boolean, string[], number[]. Add ? to a name for optional. Maximum 30 fields.

Checks only the generated flat contract. In generic mode optional fields can be absent or null.

Calculation inputs stay in this tab unless you explicitly save an eligible snapshot. No account, credit or model call is needed to calculate. Pasted-text tools always stay local.

2 / Your result

Your answer will appear here

Set the inputs, then select “Build and check the contract”. You will see the result, its assumptions and the next useful step.

  1. Define the fields
  2. Generate the schema
  3. Validate a response
Understand the answer

Method and worked example

Produces a flat object schema with unique property names, explicit required fields and additionalProperties=false. Optional fields accept null. OpenAI strict mode requires every key, with optional values represented by null.

What this result can tell you

Nested schemas, arbitrary schema imports, semantic truth and full API requests are outside this builder. Provider model support, refusals and incomplete responses still need application handling.

Test the wider prompt contract →

Method version 3.16.0

Common questions

Will valid JSON always be factually correct?

No. Schema validation checks shape and types, not evidence or correctness. Add domain checks and verify the generated facts.

Can I paste this into a consumer chatbot?

You can describe the contract in a prompt, but the API configuration fragment belongs in an application using the named API. A chat interface may not enforce it.

References and next checks

Documentation checked 2026-09-05. Provider capabilities can change; use the linked documentation for the exact model or plan.