What is JSON formatting?

JSON formatting (or prettifying) adds consistent indentation and line breaks to JSON data, making it human-readable. Minified JSON removes all unnecessary whitespace to reduce file size — useful for production APIs. This tool does both instantly in your browser.

Is my JSON data sent to a server?

No. All JSON processing happens entirely in your browser using JavaScript. Your data never leaves your device and is never sent to any server. This makes it safe to use with sensitive or confidential JSON data.

What causes a JSON parse error?

Common JSON errors include: trailing commas (not allowed in JSON), single quotes instead of double quotes, unquoted keys, missing commas between elements, unclosed brackets or braces, and invalid escape sequences in strings. This validator highlights the exact line where the error occurs.

What is the difference between JSON and JSONP?

JSON (JavaScript Object Notation) is a data format. JSONP (JSON with Padding) is a technique for cross-origin requests that wraps JSON in a function call, like callback({...}). This tool formats standard JSON only — strip the function wrapper before pasting JSONP.

What indentation should I use for JSON?

2 spaces is the most common convention for JSON files and APIs. 4 spaces is common in some ecosystems. Tabs work but can cause inconsistency. This formatter defaults to 2 spaces but lets you choose 2, 4, or tab indentation.

JSON Formatter & Validator

Paste your JSON — format, validate, and minify instantly.

100% in-browser — your data never leaves your device

Indent:

Lines: 0 Size: 0 B

Formatted output will appear here...

Lines: — Size: — Keys: —

Your data stays on your device. All JSON processing runs entirely in your browser via JavaScript. Nothing is sent to any server. Safe to use with API keys, credentials, or any sensitive data.

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