Check JSON against a JSON Schema
Paste a schema and some JSON. Each error shows where it is in the data and which rule it broke.
- Runs on your device
- No sign-up
- Works offline after a visit
How to validate JSON against a JSON Schema
- Paste the schema on the left and the JSON data on the right.
- Read the list of errors. Each one names the data spot and the schema rule.
- Click an error to jump to that spot in the data.
Questions
Which drafts are supported?
The draft comes from the $schema keyword. 2020-12 is the default when there is none, and 2019-09 and draft-07 are read with their own rules. Draft-04 and draft-06 schemas are read with draft-07 rules.
What does “Check formats” do?
With it on, date-time, date, time, email, hostname, IPv4, IPv6, uri, uuid, regex and json-pointer values are checked. With it off, the format keyword is only a note, as the specification allows.
Why does a $ref say “not fetched”?
This tool never downloads anything. A reference to another file or web address is skipped and reported, so the rest of the schema still runs. Put the referenced schema in the same document under $defs to check it.
Is my schema or data sent anywhere?
No. Both stay in your browser tab, and nothing is stored between visits except the Check formats setting.
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