JSON to OpenAI Schema Converter
Converting JSON samples to OpenAI-compatible JSON Schema is a common challenge when working with Structured Outputs. This guide explains the process and how our free tool automates it.
Why Convert JSON to Schema?
OpenAI's Structured Outputs feature requires a JSON Schema to validate AI responses. When using strict: true, your schema must follow specific rules:
- Every object must have
"additionalProperties": false - All properties must be listed in the
requiredarray - Nested objects must follow these same rules recursively
How Our Converter Works
Our converter analyzes your JSON sample and:
1. Type Inference
Automatically detects types (string, number, integer, boolean, array, object) from your sample values.
2. Strict Mode Injection
Recursively adds additionalProperties: false to every object in your schema.
3. Required Array Population
Extracts all property keys and populates the required array automatically.
Example Conversion
Input JSON:
{
"name": "John",
"age": 30,
"active": true
}Output Schema:
{
"type": "object",
"properties": {
"name": { "type": "string" },
"age": { "type": "integer" },
"active": { "type": "boolean" }
},
"required": ["active", "age", "name"],
"additionalProperties": false
}