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DEVELOPER TOOLS

JSON Schema Validator

Paste JSON and JSON Schema to catch type mismatches, missing required fields, enum problems, bounds, patterns, and additional properties.

Tool statusRuns in your browser
Preview
json / schema-validator
VALID
📄 JSON Data
7 lines · 74 chars
📐 JSON Schema
23 lines · 324 chars

Validation result

✓ VALID

✅ JSON conforms to schema

No validation issues found against the provided schema.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is JSON Schema Validator?

Paste JSON and a JSON Schema to check common structure rules such as required fields, types, enums, lengths, ranges, array items, and additional properties.

UNDERSTAND THE TOOL

How to validate JSON with a schema

Rules this validator checks

The validator supports common type checks, required object keys, properties, additionalProperties false, enum, const, string length, string pattern, numeric minimum and maximum, array length, and item schemas.

Unsupported schema keywords

Some JSON Schema features are detected but not evaluated, including oneOf, anyOf, allOf, not, $ref, if/then/else, dependencies, patternProperties, and format. When those appear, the tool shows a warning.

Reading errors

  • Each issue includes a JSON path such as $.id or $[1].name.
  • Fix syntax errors before checking schema rules.
  • Treat a warning about unsupported keywords as a reason to use a full validator before production.

Validation notes

Schema validation is only as complete as the rules this tool evaluates. Use a full JSON Schema validator when unsupported keywords are central to your contract.

Frequently Asked Questions

Does it support $ref?

No. $ref is detected as unsupported and is not resolved, so schemas that rely on references need a full JSON Schema validator.

Does format validate emails or URLs?

No. The format keyword is reported as unsupported. Use pattern or a full validator if format checks matter.

Can it validate tuple arrays?

Yes. When items is an array of schemas, each array position is checked against its matching schema.

Why does valid JSON still show issues?

Valid JSON syntax only means the text parses. Schema validation then checks whether the parsed value follows the schema rules.

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