Testing payload contracts
Validate that request or response bodies still match the schema expected by an API or integration.
JSON Schema Validator
JSON Schema Validator checks whether a JSON payload matches the structure and rules defined in a schema. It is useful for API contracts, form submissions, test fixtures, and imports where valid JSON still needs to satisfy required fields and data types.
Tool interface
What this tool does
JSON Schema Validator helps you validate JSON against a schema in the browser so you can catch missing fields, wrong types, and common rule violations before data moves into an API, app, or config pipeline.
Related next steps include JSON Validator, JSON Formatter, and the Format JSON for API debugging page if you want to keep working on the same task from a different angle.
When to use it
Use it when valid JSON still needs to satisfy a schema. This page is the right fit for required-field checks, type validation, API contract testing, and structured import reviews.
If you only need to check raw syntax, use JSON Validator. For broader JSON workflows and debugging examples, continue into the Format JSON for API debugging page.
How to use it
Paste or type your input, review the result, and copy or export it once it matches what you need.
- Paste the source input or load the example if you want to see the expected format first.
- Review the output, preview, or validation result carefully.
- Copy, download, or pass the result into the next workflow only after you confirm it matches what you need.
Example
This example shows the kind of input that often fails validation and the feedback you can review before fixing it.
Example input
{"name":"Ana","age":29}
---
{"type":"object","required":["name"],"properties":{"name":{"type":"string"},"age":{"type":"number","minimum":18}}}Example output
Valid against the supported schema checks.Common use cases
Checking required fields
Use it when valid JSON still needs to satisfy field presence, allowed types, or structural rules.
Reviewing import formats
It is useful before uploads or form submissions where schema mismatches can break the next step.
Falling back to syntax checks
If you only need to confirm raw JSON validity, continue with JSON Validator.
FAQ
What does JSON Schema Validator do?
JSON Schema Validator helps you validate JSON against a schema in the browser so you can catch missing fields, wrong types, and common rule violations before data moves into an API, app, or config pipeline.
When should I use JSON Schema Validator?
Use it when valid JSON still needs to satisfy a schema. This page is the right fit for required-field checks, type validation, API contract testing, and structured import reviews.
How is JSON Schema Validator different from JSON Validator?
JSON Schema Validator focuses on correctness and error checking. Use JSON Validator when you need to check whether JSON is valid and identify parsing issues in the browser for debugging payloads, testing API responses, or reviewing copied configuration data.
Does JSON Schema Validator run in the browser?
Yes. This tool runs in the browser so you can work with the input on the page without sending it through a custom backend on this site.
What should I use after JSON Schema Validator?
A good next step is JSON Validator or the Format JSON for API debugging page.
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Open tool pageUse case guides
These workflow pages show where this tool fits inside a real task and which next step usually follows.
Learn more
These topic hubs connect this tool to the wider cluster so users and crawlers can continue into broader informational intent when needed.
Working with this result
Use the output here as a quick browser-side check, then confirm it against your live system or source data if the result will be used in a production workflow.