About json-validator.net
A free, fast, and privacy-first JSON validator built for developers who need accurate syntax checking without friction.
What We Do
json-validator.net is a dedicated online JSON validator. Paste any JSON string and instantly know whether it is valid — with precise error messages that point to the exact line and character of every problem.
Unlike general-purpose JSON tools, this site is focused entirely on validation. Every piece of content, every guide, and every feature is built around helping developers find and fix JSON syntax errors as fast as possible.
Our Principles
Instant Results
Validation runs in your browser as you type. No button to click, no round-trip to a server.
Privacy First
Your JSON never leaves your device. No logging, no storage, no tracking.
Always Free
No paywalls, no sign-ups, no rate limits. Free to use forever.
RFC 8259 Compliant
Validates against the official JSON specification — the same standard used by all language parsers.
Get in Touch
Found a bug or have a suggestion? Reach us at [email protected]