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JSON Schema Validator - Free Online JSON Validation Tool | IconVault

Validate JSON against a JSON Schema with clear error messages, or generate a schema from JSON. Free, runs fully in your browser.

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JSON Schema Validator

Validate JSON against a schema, or generate one

5 of 5 free uses left
JSON document
JSON Schema

5 of 5 free validations left. Runs in your browser, nothing is uploaded.

What this validator supports
typerequiredpropertiesitemsenumpatternminimummaximumminLengthmaxLengthminItemsmaxItems

Honest limits: $ref, allOf, oneOf, anyOf, not, if/then and format checks are not supported. For full draft-07 validation use a dedicated library.

About this tool

IconVault's JSON Schema Validator checks your JSON document against a JSON Schema and reports exactly what fails: which property is wrong, which type was expected, and which required field is missing. It is the fastest way to debug API payloads, config files and data contracts before they break something downstream.

No schema yet? Generate one from your JSON in a single click, then tighten it with required fields, enums, formats and patterns. Validation runs fully in your browser with nothing uploaded, so production data stays local, and it is free to try (heavy repeated use may ask for Pro).

Frequently asked questions

Popular searches

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