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ALTREPO/Developer/JSON SCHEMA VALIDATOR

JSON Schema Validator

Instantly validate JSON data against a JSON Schema. Everything runs locally in your browser, keeping your data secure.

JSON Schema
JSON Data
JSON Schema Validation Architecture Diagram showing JSON data and Schema being processed by a validation engine, resulting in pass or fail. JSON Data Payload / File JSON Schema Rules & Types Validator Engine Valid Invalid
The Validator Engine checks if your JSON data perfectly conforms to the structural rules,
types, and constraints defined in your JSON Schema.

Frequently asked questions

What is a JSON Schema Validator?

A JSON Schema validator allows you to check if a specific JSON object conforms to a defined structure (the "schema"). The schema enforces rules like required fields, data types (string, number, array), and value formats, ensuring your JSON payload is correct before sending it to an API or database.

How to validate a JSON file against a schema?

Simply paste your JSON Schema into the left pane and your JSON data into the right pane. Our online tool will instantly check the data. If there are validation errors, it will tell you exactly which properties failed and why.

Is this JSON Validator safe for sensitive data?

Yes! Our JSON Schema Validator runs 100% locally in your web browser using JavaScript. We never upload your schema or data to a server, making it perfectly safe for internal API payloads, credentials, and private documents.

How to do JSON Schema validation in Java or Python?

While our online tool is great for quick manual checks, you can automate validation in your code. In Java, libraries like networknt/json-schema-validator or everit-org/json-schema are popular. In Python, you can use the jsonschema package via pip. In Node.js, we highly recommend Ajv, which is actually the same powerful engine running this web tool!