JSON Formatter

Clean, format, and validate your JSON data instantly. All formatting happens locally in your browser—your data is never uploaded, stored, or sent to a server.

JSON Formatter – SynetrixTools

📥 Input JSON

Quick Samples

0 characters

Format Options

Indent: Sort Keys:

Syntax Highlighting Quote All Keys Trailing Comma Fix Unicode Escape

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Private by design: All formatting and validation happens locally in your browser. Your JSON data is never sent to a server.

📤 Formatted Output

View:

Click a node to see its path

🔄 Convert

Convert JSON To

📊 JSON Statistics

Size (raw)

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Size (formatted)

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Keys

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Depth

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Arrays

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Objects

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Strings

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Numbers

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Nulls: — Booleans: — Valid: —

🔍 JSON Path Search

Search for a key name within the parsed JSON.

🔀 Compare / Diff

Paste a second JSON to compare against the input.

💡 JSON Tips

✅Keys must be double-quoted strings — single quotes are not valid JSON.
✅Trailing commas after the last item in an object or array are not allowed.
✅Use null instead of undefined — undefined is not a valid JSON value.
✅Comments are not part of the JSON spec — remove them before parsing.
✅All processing is local — your data never leaves your browser.

❓ Frequently Asked Questions

What is JSON? ▼

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is language-independent and is widely used for APIs, configuration files, and data storage.

Is my data safe? ▼

Yes. All formatting, validation, and conversion happens entirely in your browser using JavaScript. Your JSON data is never transmitted to any server, stored in a database, or logged in any way. The tool works completely offline once the page is loaded.

What is the difference between formatting and minifying? ▼

Formatting (also called "pretty-printing") adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to produce the smallest possible output — ideal for reducing payload size in APIs and network requests.

Why does my JSON fail validation? ▼

Common causes include: trailing commas after the last item, single-quoted strings instead of double-quoted, unquoted keys, comments (not allowed in JSON), or missing/extra brackets and braces. The error message shown will point to the approximate location of the issue.

What conversions are supported? ▼

This tool can convert JSON to CSV (for flat arrays of objects), XML, YAML, and HTML Table. All conversions are performed locally in your browser and the result can be copied or downloaded directly.