Free JSON Schema Validator Online

Check whether JSON matches a provided schema in a simple browser-based workflow.

JSON Schema Validator

Validate JSON documents against JSON Schema definitions.

🔒 Processes data locally in your browser — input isn’t uploaded or stored.

What This Tool Does

Paste JSON and a schema, validate them, and review any validation errors.

How to Use

Paste JSON input in the first field and JSON Schema in the second field.
Click Validate JSON.
Review validation errors (or the valid status) and update input as needed.

Common Mistakes

Using invalid JSON syntax in either the JSON or schema field.
Expecting schema validation to pass when required fields are missing.
Forgetting to align data types between schema rules and actual values.

Workflow Notes

Use Load Valid Example or Load Invalid Example to quickly verify expected behavior.
Keep JSON and schema fields synchronized so property names and types match.
Validation output lists field-level errors so you can fix input quickly.

Related Tools

Continue with related tools that handle the next step in your workflow.

JSON Validator - Validate JSON and inspect syntax errors.
JSON Formatter - Format and minify JSON payloads.
JSON Minifier - Minify JSON payloads for compact transport.
CSV to JSON Converter - Convert CSV rows to JSON output.
Email Validator - Validate email syntax, parts, and common formatting errors.

FAQ

What does JSON Schema Validator help with?

Validate JSON documents against JSON Schema definitions. It is useful for debugging, validation, and fast transformation tasks.

Can I paste raw data directly?

Yes. Paste your input as-is, run the action, then copy the output you need.

Is my input sent to a server?

Your input is processed locally in your browser. It isn't uploaded or stored.

What input format is supported?

Paste JSON input and a JSON Schema, then click Validate JSON to review validation results.