JSON Schema Generator

• Free online tool to generate JSON Schema from your JSON data — it auto-builds a standard JSON Schema for you
• Supports Draft 2020-12 / 2019-09 / Draft-07 / Draft-06 / Draft-04, with customizable options such as required fields, additionalProperties, and descriptions
• Generates in real time as you type (no button needed), with one-click copy or download as .json, plus ready-to-load sample data

1. Open the tool page — no installation needed
2. Enter your JSON in the left editor, or click "Load Example" to insert a sample; then pick a Schema version (2020-12 / 2019-09 / 07 / 06 / 04)
3. Toggle the generation options (include required, allow additionalProperties, generate descriptions) — the Schema updates live on the right; click "Copy" to copy it or "Download Schema" to save the file

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online JSON Schema generator tool. Input JSON data and automatically generate standard JSON Schema. Supports Draft 2020-12/2019-09/Draft-07/Draft-06/Draft-04 schema versions with customizable options like required fields and additionalProperties. Powered by Monaco Editor for professional code editing experience.

Open the tool page — no installation needed Enter your JSON in the left editor, or click "Load Example" to insert a sample; then pick a Schema version (2020-12 / 2019-09 / 07 / 06 / 04) Toggle the generation options (include required, allow additionalProperties, generate descriptions) — the Schema updates live on the right; click "Copy" to copy it or "Download Schema" to save the file

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, JSON Schema Generator is completely free. No download or installation required — it runs right in your browser.