JSON Formatter & Validator
Format, validate, and beautify JSON data instantly. Free, no signup required — runs entirely in your browser.
Frequently Asked Questions
What is JSON?▼
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is the most common format for APIs and configuration files.
How do I format JSON online?▼
Paste your JSON into the input field above and it will be automatically formatted with proper indentation. You can choose between 2-space, 4-space, or tab indentation. Use the Minify tab to compress JSON, or Tree View to explore the structure.
What is the difference between JSON and YAML?▼
JSON uses braces and brackets with strict syntax, while YAML uses indentation-based syntax and is more human-readable. JSON is more widely used in APIs, while YAML is popular for configuration files (e.g., Docker, Kubernetes).
Why is my JSON invalid?▼
Common JSON errors include: trailing commas after the last item, single quotes instead of double quotes, unquoted keys, comments (JSON doesn't support comments), and missing closing braces or brackets.
Is this JSON formatter safe to use?▼
Yes. All formatting and validation happens entirely in your browser using JavaScript. No data is sent to any server. Your JSON never leaves your machine.
