JSON Formatter
Pretty print and beautify JSON with configurable indentation. Paste your JSON and format it instantly.
JSON Formatting Best Practices
Follow these tips to keep your JSON clean and consistent across projects.
Use Consistent Indentation Across Your Team
Pick either 2 or 4 spaces and stick with it project-wide. Add a .editorconfig or Prettier config to enforce the convention automatically. Consistent formatting makes code reviews faster and diffs cleaner.
Format Before Committing to Version Control
Always format JSON files before pushing to Git. This prevents noisy diffs caused by whitespace-only changes and helps your team focus on real content differences during reviews.
Minify JSON for Production APIs
When serving JSON over APIs, minify it to reduce payload size by 30-60%. Smaller payloads mean faster network transfers, lower bandwidth costs, and improved mobile performance.
Sort Keys for Predictable Output
Sorting object keys alphabetically makes JSON deterministic and diff-friendly. This is especially useful for configuration files, lock files, and any JSON that is stored in version control.
Formatting Features
Professional JSON formatting tools at your fingertips.
Configurable Indentation
Choose between 2 or 4 spaces indentation to match your coding style and project standards.
One-Click Format
Format JSON instantly with a single click or keyboard shortcut (Ctrl/Cmd + Shift + F).
Syntax Highlighting
Color-coded JSON with bracket matching and code folding for easy reading.
What is JSON Formatting?
JSON formatting (also called "pretty-printing") adds indentation, line breaks, and spacing to a JSON document so humans can easily read it. Minified JSON is optimized for machines; formatted JSON is optimized for developers.
Before (Minified)
{"name":"Alice","age":30,"roles":["admin","user"]}After (Formatted, 2 spaces)
{
"name": "Alice",
"age": 30,
"roles": [
"admin",
"user"
]
}JSON Formatter FAQ
What does a JSON formatter do?
A JSON formatter takes compact or poorly formatted JSON and restructures it with proper indentation and line breaks, making it easy to read and debug.
Can I choose the indentation size?
Yes, you can choose between 2-space and 4-space indentation using the toolbar controls.
Does it preserve my data?
Absolutely. Formatting only changes whitespace — all keys, values, and structure remain identical.
Can I format JSON with a keyboard shortcut?
Yes! Use Ctrl+Shift+F (or Cmd+Shift+F on Mac) to format the entire document instantly. You can also click the Format button in the toolbar.
What is the difference between formatting and minifying JSON?
Formatting adds whitespace, indentation, and line breaks to make JSON human-readable. Minifying does the opposite — it strips all unnecessary whitespace to produce the smallest possible output, ideal for APIs and production use.
Can I sort JSON keys alphabetically?
Yes, click the Sort Keys button in the toolbar. This reorders all object keys alphabetically at every level of nesting, making your JSON deterministic and easier to diff.
Does this tool work offline?
Yes, JSON Online is a Progressive Web App (PWA). Once loaded, it works entirely offline. All processing happens in your browser — no internet connection required after the initial load.
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