About this tool
Validate JSON data against a JSON Schema. Useful when reviewing API responses, cleaning config before commit, or sharing readable snippets in docs and PRs.
Paste the instance document into JSON Data. Paste your schema into JSON Schema (type, required, properties, items). Example — Check a profile object against a small schema: try `Data: {"name":"Ada","age":30} Schema: {"type":"object","required":["name"],"properties":{"name":{"type":"string"},"age"…` and expect something like `Data matches schema (basic validation passed).`.
Supports a practical subset (type, required, properties, items) — not the full JSON Schema draft feature set. See also: JSON Validator, JSON Formatter, and JSONPath Tester. Runs in your browser — nothing you paste gets uploaded.
How to use
- Paste the instance document into JSON Data.
- Paste your schema into JSON Schema (type, required, properties, items).
- Click Validate.
- On success, Result confirms a basic match; on failure, read the path-specific errors.
Example
Check a profile object against a small schema
Input
Data: {"name":"Ada","age":30}
Schema: {"type":"object","required":["name"],"properties":{"name":{"type":"string"},"age":{"type":"integer"}}}Output
Data matches schema (basic validation passed).
Limitations
- Supports a practical subset (type, required, properties, items) — not the full JSON Schema draft feature set.
- `$ref`, `oneOf`/`anyOf`, formats, and pattern constraints are not fully implemented here.
- Use Ajv or your API gateway for production-grade schema validation.
Related guides
1Related tools
3Frequently asked questions
What does the JSON Schema Validator do?
Validate JSON data against a JSON Schema. Runs in your browser — no install, no account.
How do I use the JSON Schema Validator?
Paste the instance document into JSON Data. Paste your schema into JSON Schema (type, required, properties, items). Click Validate. On success, Result confirms a basic match; on failure, read the path-specific errors.
Is the JSON Schema Validator free?
Yes. No signup, no usage limits, no paywall.
Does the JSON Schema Validator upload my data?
No. Processing happens locally in JavaScript. Your input is not uploaded, stored, or logged.
What are the limitations of the JSON Schema Validator?
Supports a practical subset (type, required, properties, items) — not the full JSON Schema draft feature set. `$ref`, `oneOf`/`anyOf`, formats, and pattern constraints are not fully implemented here. Use Ajv or your API gateway for production-grade schema validation.