JSON
JSON Schema Validator
Validate JSON documents against a JSON Schema (draft-07 / 2019-09 / 2020-12) with precise error paths.
Code generation from strings disallowed for this context
Why use our JSON Schema Validator?
100% private
Everything runs in your browser. Your data never leaves your device — safe for production payloads.
Instant results
No round trips, no rate limits, no login. Format, validate and inspect megabytes of JSON in milliseconds.
Standards-first
Follows RFC 8259 / ECMA-404 exactly. Reports errors with precise line and column diagnostics.
Related developer tools
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Validate JSON syntax against RFC 8259 in real time. Precise line and column error reporting, 100% client-side.
OpenJSON to JSON Schema
Generate a JSON Schema (draft-07) from any JSON example — infers types, required fields and nested structure.
OpenJSON Compare
Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.
OpenJSON Diff
Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.
OpenJSON Minifier
Strip whitespace and shrink JSON payloads to the smallest possible size for APIs, storage, and network transfer.
OpenJSON Parser
Parse JSON strings into structured objects with instant syntax errors, a live tree view and copyable JSON paths.
OpenRelated reading
Deep-dive guides that pair well with the JSON Schema Validator.
Tutorials
The complete JSON validation guide
How to validate JSON at every layer — parser, JSON Schema, and business logic — with practical examples.
ReadComparisons
JSON Formatter vs JSON Validator: what's the difference?
Formatters make JSON readable. Validators prove it is correct. Here's when to reach for each — and why great tools do both.
ReadGuides
What is JSON? A developer's introduction
Understand the JSON data format, its history, and why it dominates modern APIs and configuration files.
Read