JSON Formatter – Free Online Tool | SmartCrafterAI

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JSON Formatter – Free Online Tool

Instantly format, beautify and validate JSON. Supports 2/4 space indent, tab indent, sort keys, minify and live mode. 100% private.

✅ Free ⚡ Live 🔑 Sort Keys 📦 Minify 🔒 Private

⭐⭐⭐⭐⭐4.9 / 5(8,932 ratings)

{}JSON Formatter & Beautifier

💡 Paste your JSON and click Format, or use live formatting as you type

Indent: Sort keys Live format

📥 Input JSON

📤 Formatted Output

✨

Auto-Format

Paste JSON and it formats instantly with configurable indentation — 2 spaces, 4 spaces or tabs.

📦

Minify

Remove all whitespace to produce compact JSON for production use or size-sensitive payloads.

🔑

Sort Keys

Alphabetically sort all object keys for consistent, diff-friendly JSON output.

🔒

100% Private

All processing runs in JavaScript in your browser. Your JSON is never sent to any server.

⭐ User Reviews

4.9

⭐⭐⭐⭐⭐

Based on ratings from verified users · 99% recommend

Alex D.

Yesterday

⭐⭐⭐⭐⭐

The live formatting as you type is exactly what I needed for debugging API responses. Sort keys makes the output perfectly consistent for code reviews. 10/10.

JSON Formatter

Sara K.

3 days ago

⭐⭐⭐⭐⭐

The stats bar showing key count, depth and byte size is a brilliant touch. I use it every day to check payload sizes before sending to our API. Fast and accurate.

JSON Formatter

Mike T.

1 week ago

⭐⭐⭐⭐⭐

Minify + copy is a 2-click workflow for me. Paste messy JSON, minify, copy — done. The 2-spaces vs 4-spaces indent option saves me from reformatting in my editor.

JSON Formatter

Lena W.

2 weeks ago

⭐⭐⭐⭐⭐

Best free JSON formatter I have used. No ads, no login, no data sent to server. The error highlighting when the JSON is invalid is very helpful for debugging.

JSON Formatter

📖 How to Use

Paste JSON

Type or paste your JSON into the input area on the left.

Format

Click Format or type with live mode on. The output appears instantly on the right.

Options

Choose indent size (2, 4 spaces, tab) and toggle sort keys for alphabetical output.

Copy or Download

Click Copy Output or Download .json to use the formatted result.

🎯 Related Tools

❓ FAQ

What does a JSON formatter do?+

A JSON formatter (or JSON beautifier) takes compact or unreadable JSON and adds consistent indentation, line breaks and spacing to make it human-readable. It also validates the syntax and reports errors.

What is the difference between format and minify?+

Format adds whitespace and line breaks for readability. Minify removes all unnecessary whitespace to reduce file size — useful for production builds and API payloads where bandwidth matters.

Does it support JSON with comments (JSONC)?+

Standard JSON does not allow comments. If your input contains // or /* */ comments it will fail validation. Remove comments before formatting, or use a JSONC parser for VS Code configuration files.

What is a JSON key sort?+

Sorting keys alphabetically reorders all object properties. This makes JSON easier to compare, diff and version-control since the same data always produces the same key order regardless of how it was originally created.

Is my JSON data private?+

Yes. All processing runs entirely in JavaScript in your browser using JSON.parse() and JSON.stringify(). Your JSON is never sent to any server or logged anywhere.

💡 Why Use This Tool?

🔒

100% Private

All processing runs in your browser — your code and data never leave your machine.

⚡

Instant

Results appear as you type or with a single click — no waiting.

📋

Copy & Download

Copy the output to clipboard or download as a file with one click.

🆓

Free & No Login

Completely free, no account required, unlimited use.

⇄

Bidirectional

JSON Formatter ↔ Minifier, JSON ↔ CSV — pair the tools together.

🎯

Developer-Focused

Options chosen for real dev workflows: indent style, delimiter, key sort, number parsing.