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Online JSON Schema Converter

Convert sample JSON into a JSON Schema, generate example JSON from an existing schema, or export a schema into an OpenAPI 3.0 compatible components.schemas block. Everything runs locally in your browser (no uploads).

Category: SEO · URL: /tools/online-json-schema-converter.html

Tip: For tests/debugging, run window.feutexSelfTest() in the console.

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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Pick a conversion mode, paste input, and click Convert.

  1. Select JSON → JSON Schema, JSON Schema → Example JSON, or JSON Schema → OpenAPI.
  2. Paste your JSON or schema into the input box.
  3. Adjust options (draft, required fields, additionalProperties) if needed.
  4. Click Convert, then Copy to reuse the output.
Keywords this page targets (natural cluster): online json schema converter, json to json schema converter, generate json schema from json, json schema to example json, json schema example generator, json schema to openapi converter, convert $defs to openapi components, draft 2020-12 json schema generator, draft-07 json schema generator, infer json schema from sample, json schema required fields generator, json schema anyof generator, openapi schema from json, json schema validator helper, json schema pretty print, json schema minify, create schema for nested json, json array items schema generator, json schema $ref resolver local, convert json schema definitions to $defs
Secondary intents covered: Generate a JSON Schema from a real JSON payload, Create a quick example JSON object from a schema to test APIs, Export JSON Schema into an OpenAPI 3.0 components schema structure, Add/remove required fields and additionalProperties for stricter validation, Switch schema draft URI (2020-12 vs draft-07) for compatibility, Troubleshoot schema errors by seeing a clean, normalized output, Replace $defs/definitions references to match OpenAPI $ref paths, Make a lightweight schema for arrays and nested objects

FAQ

Does this tool run offline?

Yes. All conversion happens in your browser and no data is sent anywhere.

What JSON Schema draft does it generate?

You can include the $schema URI for 2020-12 or draft-07; the generated structure stays broadly compatible for common keywords.

How are required fields decided when converting JSON to schema?

If enabled, every key present in the sample object is marked as required (it can’t infer missing/optional fields from a single example).

How does it handle arrays with mixed item types?

It generates anyOf in items when it sees different types across elements.

Can it generate example JSON from schemas with $ref?

It supports local refs like #/$defs/Name or #/definitions/Name; remote refs aren’t supported.

What does the OpenAPI conversion output?

It outputs a minimal OpenAPI 3.0 document with your schema under components.schemas (Root + any $defs/definitions).

Will it validate my schema?

No full validator is included; it focuses on conversion and will only report JSON parsing errors or unsupported refs.