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JSON Schema Validator

Paste a JSON Schema and a JSON document — every violation is listed with its exact JSON path and a plain-English message. Everything runs in your browser.

How it works & supported keywords

The validator is hand-rolled in vanilla JavaScript and implements a practical subset of JSON Schema draft-07: type (including integer and type arrays), properties, required, additionalProperties (both false and schema form), items (single schema or positional tuple), enum, const, minimum / maximum, minLength / maxLength, pattern (JavaScript regex), minItems / maxItems, and $ref pointers into #/definitions (any local #/… pointer works). Boolean schemas true/false are honored.

Not implemented: allOf/anyOf/oneOf/not, if/then/else, format, uniqueItems, multipleOf, exclusiveMinimum/exclusiveMaximum, patternProperties, dependencies, and remote $refs. Validation does not stop at the first problem — every violation is reported with its JSON path. Your schema and data never leave the page.

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Found this useful? 113 free, browser-only tools by Yuvrajsinh Jadav — an engineer who ships production AI systems. No account, nothing sent anywhere.
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