Does it check against a JSON Schema?

Not yet — it validates syntax (RFC 8259). JSON Schema validation is on the roadmap.

JSON Validator

100% In-Browser

Validate JSON syntax and pinpoint the exact line and column of any error — locally.

Input Data0 characters

Transformed Output

Zero Data Collection

Files are processed 100% locally

Instant Client-Side Speed

Zero network upload delays

Free & Unlimited

No registration or credit card needed

Validate JSON Syntax With Exact Error Positions

A strict JSON validator: paste a payload and immediately learn whether it parses, and if not, exactly where it breaks — missing comma at line 42, unescaped quote at character 1,204. The error message comes straight from a standards-compliant parser.

Because it runs locally, it is safe for payloads containing API keys, tokens, or customer data. Nothing is uploaded, ever.

Frequently Asked Questions

Everything you need to know about using JSON Validator safely and efficiently.

The exact parser failure message and the character position, so you can jump straight to the problem in your editor.

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