JSON Formatter & Validator

What is a JSON formatter?

A JSON formatter (also called a JSON beautifier) takes a compact or unformatted JSON string and reformats it with proper indentation, line breaks, and whitespace to make it human-readable. This tool also validates the JSON and shows an error message if the input is not valid JSON.

What is JSON minification?

JSON minification removes all unnecessary whitespace from a JSON string, making it as compact as possible. Minified JSON is smaller in size, which speeds up API responses and network transfers. The data and structure remain identical — only the formatting is stripped.

How do I fix a JSON parse error?

Common JSON errors: trailing commas after the last property (not allowed in JSON), single quotes instead of double quotes, unquoted keys, missing commas between properties, and control characters in strings. This tool shows the exact error message from the parser to pinpoint the issue.

What is the difference between 2-space and 4-space indent?

Both are valid formatting choices. 2-space indent is more compact and common in JavaScript, Node.js, and API responses. 4-space indent is preferred in some enterprise codebases and Python projects. Neither affects how the JSON is parsed.

Is my JSON data safe to paste here?

Yes. All formatting and validation runs entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). No data is sent to any server. You can safely paste API keys, database records, or any sensitive JSON.

What is the maximum JSON size this handles?

The tool handles JSON files up to several megabytes without issues. Very large JSON (10MB+) may be slow depending on your device. For extremely large files, consider using VS Code with Prettier, or jq on the command line (jq . input.json).