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JSON Sample to Schema Draft

Generate a conservative JSON Schema draft from an observed sample.

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  1. 01

    Add your input

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  2. 02

    Make it yours

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  3. 03

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JSON Schema from example online

Generate a conservative JSON Schema draft from an observed sample. Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

How to use it

Paste JSON matching the structure in the example. Choose Run tool. Review the output, then copy or download it.

Worked examples

Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

Reproducible worked example

Settings: No additional settings.

Input:

{"name":"Anna","age":30,"tags":["a"]}

With the input and settings above, the tool produces:

Output:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "age": {
      "type": "integer"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  }
}

The example returns an object with 3 top-level fields. The fields “$schema”, “type”, “properties” identify the returned values or sections.

Limitations and common mistakes

  • Observed types only. Does not infer required fields, business rules, formats or every valid future value.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The worked example shows the supported structure and actual output.

How can I create a conservative JSON Schema draft from an observed sample online?

Paste JSON matching the structure in the example. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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