Developer Tools
JSON Schema Validator
Validate pasted JSON against a pasted JSON Schema subset directly in your browser, with clear issue paths for common API and config checks.
Checks common JSON Schema rules: type, required, properties, items, enum, const, min/max length, min/max number, pattern, and additionalProperties=false.
JSON Schema validation workflow tips
Use this tool for quick browser-local checks before sharing API examples, fixtures, config snippets, or documentation payloads. It is intentionally lightweight and covers common JSON Schema rules, not every advanced draft feature.
Validate syntax first
Both boxes must contain valid JSON. If the data itself is malformed, start with JSON Validator or JSON Formatter to catch syntax errors first.
Check common contract rules
Supported rules include type, required, properties, items, enum, const, string length, numeric ranges, regular-expression patterns, and additionalProperties: false.
Know the limitation
For full draft validation with refs, allOf/anyOf/oneOf, formats, conditionals, or remote schemas, use a dedicated validator in your development environment. This page is for fast pasted-input QA.
What this tool does
JSON Schema Validator parses a schema and a JSON document, then checks common schema rules such as type, required fields, object properties, array items, enum, const, string length, numeric ranges, pattern, and additionalProperties=false.
Common use cases
Validate pasted JSON against common JSON Schema rules before sharing API examples, fixtures, config snippets, or documentation payloads.
Use JSON Schema Validator when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Paste a JSON Schema object in the first box.
- Paste the JSON data you want to check in the second box.
- Review valid/invalid status, issue paths, and rule messages before formatting, minifying, or sharing the payload.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Client-side only: JSON Schema validation runs in your browser and pasted schema/data are not uploaded, stored, fetched, or logged.
FAQ
Does this JSON Schema validator upload my schema or data?
No. The schema and JSON data are parsed and checked locally in your browser and are not uploaded, stored, fetched, or logged by ClearUtils.
Which JSON Schema rules are supported?
It checks common rules including type, required, properties, items, enum, const, minLength, maxLength, minimum, maximum, pattern, and additionalProperties=false.
Is this a full JSON Schema draft validator?
No. It is a lightweight pasted-input validator for common checks. Use a dedicated development validator for refs, formats, allOf/anyOf/oneOf, conditionals, and remote schemas.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.