Jak formatovat JSON jako profesional

JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. Proper formatting -- also called "pretty-printing" -- adds indentation, line breaks, and consistent spacing that makes JSON far more readable than a minified single-line string.

• Key-value pairs: Data is stored as "key": value pairs
• Strings: Always use double quotes ("hello"), never single quotes
• Numbers: No quotes around numbers (42, not "42")
• Booleans: Lowercase true and false (not True)
• Null: Lowercase null (not None or nil)
• Arrays: Square brackets [1, 2, 3]
• Objects: Curly braces {"key": "value"}
• Commas: Separate items with commas, but no trailing comma after the last item

• Single quotes: JSON requires double quotes. {'key': 'value'} is invalid. Fix: {"key": "value"}
• Trailing commas: {"a": 1,} is invalid. Remove the last comma.
• Comments: JSON does not support // or /* */ comments. Remove them.
• Unquoted keys: {key: "value"} is invalid. JSON requires {"key": "value"}
• NaN/Infinity: Not valid JSON. Use null or a string representation.

Here is a well-formatted JSON object representing a user profile:

{
  "name": "Jane Doe",
  "email": "jane@example.com",
  "age": 30,
  "active": true,
  "roles": ["admin", "editor"],
  "address": {
    "city": "Prague",
    "country": "Czech Republic"
  },
  "preferences": null
}

Use our JSON Formatter tool to instantly beautify any minified JSON.

• Always validate JSON before using it in production
• Use 2-space indentation for readability
• Keep JSON files under 1MB for browser performance
• Use consistent key naming (camelCase or snake_case)
• Consider JSON Schema for complex data validation