How to use JSON Schema Validator
Validate JSON against draft-07, 2019-09, or 2020-12 JSON Schema with complete local-reference diagnostics.
What to provide
Paste a schema. Local JSON Pointer references, $defs/definitions, recursive references, conditionals, composition, and unevaluated keywords are resolved without network access.
Paste the JSON value to validate against the schema.
- Paste, type, or drag and drop a supported text file into the input area.
- Place the second value in the adjacent panel. Sensitive fields are masked by default.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
Use “Swap inputs” to reverse the comparison without copying either value.
What the result means
Validation status plus every instance path, schema path, keyword, and human-readable error.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Remote HTTP(S) references are rejected: bundle every referenced schema under the root document. Custom application keywords are not installed.
Try the included example
Select “Load example” at any time to restore this tested sample.
{"$schema":"https://json-schema.org/draft/2020-12/schema","$defs":{"id":{"type":"integer","minimum":1}},"type":"object","properties":{"id":{"$ref":"#/$defs/id"},"email":{"type":"string","format":"email"}},"required":["id","email"],"additionalProperties":false}{"id":7,"email":"ada@example.com"}