JSON Prettify

Q: How do I prettify JSON in the terminal?

Use jq: cat file.json | jq '.' prints the file with 2-space indentation. In Python run python -m json.tool file.json. On Node.js use node -e "console.log(JSON.stringify(JSON.parse(require('fs').readFileSync(0,'utf8')),null,2))" < file.json. All three accept piped input.

Q: What is JSON Prettify?

JSON Prettify (also called JSON format or JSON beautify) takes compact, single-line JSON and re-serializes it with consistent indentation, line breaks, and spacing. The data itself stays identical; only the visual layout changes so humans can read, edit, and debug the structure more easily.

Q: How do I prettify JSON online?

Open utilaz.com/json-prettify, paste or drag-and-drop your JSON into the input area, choose your preferred indent size (2 spaces, 4 spaces, or tabs), and click Format. The prettified output appears instantly and can be copied to clipboard or downloaded as a file.

Q: What common JSON syntax errors should I avoid?

The most frequent mistakes are: trailing commas after the last item in an object or array, using single quotes instead of double quotes around keys and strings, leaving comments (// or /* */) in the document, unescaped special characters inside strings, and missing commas between key-value pairs. Our tool highlights the exact line and position of any syntax error so you can fix it quickly.

About JSON Prettification

JSON prettification formats and beautifies JSON data by adding proper indentation, line breaks, and spacing. This makes JSON more readable and easier to debug, especially when working with minified or compressed JSON data.

Add proper indentation and line breaks
Format nested objects and arrays clearly
Validate JSON syntax and structure
Customize indentation style (spaces or tabs)
Make minified JSON human-readable

Benefits of JSON Prettification

Development Benefits

Improved code readability
Easier debugging and troubleshooting
Better code reviews and collaboration
Faster identification of structure issues
Enhanced documentation quality

Maintenance Advantages

Easier configuration file editing
Better API response analysis
Simplified data structure understanding
Reduced cognitive load when reading
More efficient team collaboration

Prettification Examples

Before Prettification (Minified):

{"users":[{"id":1,"name":"John Doe","email":"john@example.com","settings":{"theme":"dark","notifications":true}},{"id":2,"name":"Jane Smith","email":"jane@example.com","settings":{"theme":"light","notifications":false}}],"meta":{"total":2,"page":1}}

Readable: Difficult to read and understand structure

After Prettification (2-space indent):

{
  "users": [
    {
      "id": 1,
      "name": "John Doe",
      "email": "john@example.com",
      "settings": {
        "theme": "dark",
        "notifications": true
      }
    },
    {
      "id": 2,
      "name": "Jane Smith",
      "email": "jane@example.com",
      "settings": {
        "theme": "light",
        "notifications": false
      }
    }
  ],
  "meta": {
    "total": 2,
    "page": 1
  }
}

Readable: Clear structure, easy to understand and edit

Indentation Style Comparison

2-Space Indentation:

{
  "config": {
    "api": {
      "url": "https://api.example.com",
      "timeout": 5000
    },
    "features": {
      "auth": true,
      "cache": false
    }
  }
}

More compact, fits more on screen

4-Space Indentation:

{
    "config": {
        "api": {
            "url": "https://api.example.com",
            "timeout": 5000
        },
        "features": {
            "auth": true,
            "cache": false
        }
    }
}

Better visual hierarchy, easier to scan

Prettify JSON in Any Environment

JSON prettification parses compact data and re-serializes it with human-readable indentation. Here is how to do it across popular platforms with a single command or function call.

Quick Reference by Language:

JavaScript: JSON.stringify(JSON.parse(str), null, 2)

Python: json.dumps(json.loads(s), indent=2, sort_keys=True)

CLI (jq): jq '.' file.json

PHP: json_encode(json_decode($s), JSON_PRETTY_PRINT)

Common Options:

Indent size (2 spaces, 4 spaces, or tabs)
Sort keys alphabetically
Remove null or empty values
Ensure ASCII-safe output

When to Prettify:

Debugging API responses
Editing config files manually
Writing documentation examples
Reviewing pull request diffs

Our browser-based tool handles all of this instantly with no install required. Paste, click, and copy the formatted result.

Frequently Asked Questions

Can I prettify JSON in my browser?

Yes. Paste your JSON into the utilAZ JSON Prettify tool and click Format. The entire process runs client-side in your browser so your data never leaves your machine. You can also open your browser console and run JSON.stringify(JSON.parse(str), null, 2) for a quick one-liner.

How do I prettify JSON in the terminal?

Use jq: cat file.json | jq '.' prints the file with 2-space indentation. In Python run python -m json.tool file.json. On Node.js use node -e "console.log(JSON.stringify(JSON.parse(require('fs').readFileSync(0,'utf8')),null,2))" < file.json. All three accept piped input.

What is JSON Prettify?