JSON Schema Generator — free online
You have a chunk of JSON, and now someone needs a schema for it. Writing one by hand is slow and easy to get wrong, especially with nested objects. We added a free tool that does it for you — JSON Schema Generator — right in your browser.
What it does
Paste a sample of your JSON and it instantly builds a matching JSON Schema. You can pick the draft you need (draft-07 or 2020-12), and it works out the types from your data for you, so you don't have to map every field by hand.
Nothing leaves your device
The whole thing runs inside your browser. Your JSON isn't sent anywhere, nothing is uploaded, and nothing is saved on a server. When you close the tab, it's gone.
How to use it
- Open JSON Schema Generator and paste your sample JSON into the box.
- Choose the draft you want — draft-07 or 2020-12.
- Copy the schema it gives you and drop it into your project.
It's free with no limit. There are more small tools on the Apps page.