JSON Formatter

Format, validate, and minify JSON data

Raw Input

JSON Viewer

Common Use Cases

API debugging: Copy the response from Postman or browser DevTools and format it for easy reading.
Config files: Format package.json, appsettings.json, tsconfig.json for readability.
Data pipelines: Validate JSON before ingesting into databases or message queues.
Log analysis: Many logging systems output minified JSON — format it for quick diagnosis.

JSON Syntax Rules

Keys must be double-quoted strings: "name" not name.
Values can be: string, number, boolean, null, array, or object.
No trailing commas allowed (unlike JavaScript objects).
No comments allowed in standard JSON.

Frequently Asked Questions

The validator catches: missing commas between elements, unclosed brackets/braces, trailing commas (not allowed in JSON), unquoted keys, single-quoted strings instead of double-quoted, and control characters in strings. It also flags if the input is empty or not JSON at all.

No — JSON formatting and validation happens entirely in your browser using JavaScript's native JSON.parse() and JSON.stringify(). Your data never leaves your device. This makes it safe to use with sensitive API responses.

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