⚡ Dev tools that ship faster — 170+ templates for $49

JSON Formatter & Validator

Paste JSON, get instant formatting, validation, and syntax highlighting

Paste JSON in the left panel
INPUT
OUTPUT 




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What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is used extensively in web APIs, configuration files, and data storage. This tool helps you validate JSON syntax, format it for readability, and catch errors before they reach production.
Common JSON Errors
The most common JSON errors are: trailing commas, single quotes instead of double quotes, unquoted keys, and comments (JSON doesn't support comments). This formatter highlights exactly where errors occur and can auto-fix quote issues.