JSON Formatter & Validator
Format, beautify, validate, and minify JSON payloads with instant syntax error messages.
JSON Input
How to Use the JSON Formatter & Validator
- Paste your JSON into the input box. It's validated instantly as you type.
- Check the status: "Valid JSON" shows the formatted result, while "Invalid JSON" shows the parser's error message.
- Choose 2-space or 4-space indentation for the formatted output.
- Copy the output, download it as data.json, or click "Compact Minify" to collapse your input to a single line.
JSON Formatter & Validator Features
- Configurable 2-space or 4-space indentation
- Instant validation with the parser's error message
- One-click minify, copy, and download
Frequently Asked Questions
Why is my JSON invalid?
The most common causes are trailing commas, single quotes instead of double quotes, unquoted property names, comments, and JavaScript-only values such as undefined or NaN. JSON requires double-quoted keys and strings. The error message usually includes the position where parsing failed.
What's the difference between JSON and a JavaScript object?
JSON is a strict text format inspired by JavaScript object syntax. Every key must be a double-quoted string, and values are limited to strings, numbers, booleans, null, arrays, and objects. Functions, dates, comments, and trailing commas are not allowed.
Is my JSON data sent to a server?
No. Parsing and formatting happen entirely in your browser using its built-in JSON parser, so it's safe to inspect API responses that contain tokens or personal data.