JSON Validator

JSON Schema Validator

Validate JSON documents against a JSON Schema (draft-07 / 2019-09 / 2020-12) with precise error paths.

XML Validator

Validate XML syntax with detailed error messages. Instantly find missing tags, unquoted attributes and malformed structure.

JSON Compare

Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.

JSON Diff

Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.

JSON Minifier

Strip whitespace and shrink JSON payloads to the smallest possible size for APIs, storage, and network transfer.

JSON Parser

Parse JSON strings into structured objects with instant syntax errors, a live tree view and copyable JSON paths.

Developer Tips

10 common JSON errors and how to fix them

Every JSON syntax error you'll ever see — trailing commas, unquoted keys, bad escapes — with a working repair strategy.

Tutorials

The complete JSON validation guide

How to validate JSON at every layer — parser, JSON Schema, and business logic — with practical examples.

Comparisons

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.