JSON validator.

Paste a JSON Schema into the Schema panel and Pandia validates the document live as you edit either side. Each error shows its failing path and the reason — click it to land on the offending node.

Example

A schema requiring an integer id and a string name:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["id", "name"],
  "properties": {
    "id":   { "type": "integer" },
    "name": { "type": "string" }
  }
}

Validated against { "id": "42" }, Pandia reports two errors:

/id    "42" is not of type "integer"
$      "name" is a required property

What you get

• Live validation against draft-07 and 2020-12.
• Clickable errors with the failing path and reason.
• A running error count in the status bar.
• It can also generate a JSON Schema from a document.

Frequently asked questions

Does Pandia validate JSON syntax or against a schema?

Both. The editor flags syntax errors live as you type, and the Schema panel validates the document against a JSON Schema, showing each failing path and reason.

Which JSON Schema drafts are supported?

Draft-07 and 2020-12, selected automatically from the schema’s $schema declaration.

Can it validate large JSON files offline?

Yes — validation runs entirely on your machine with no upload, so it works offline and on large documents.

Related: JSON diff · JSON repair · large JSON viewer · all tools · download.