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PromptUtils

JSON Formatter & Validator

Format, minify, and validate JSON

JSON Formatter & Validator

Paste your JSON to format, minify, or validate. See syntax highlighting and get detailed error reports.

Input Stats

Characters: 0

Size: 0 B

Output Stats

Characters: 0

Size: 0 B

How to Use

  1. Paste JSON – Copy your JSON into the Input field
  2. Choose action – Click Format, Minify, or Validate
  3. Review output – See formatted JSON and error messages
  4. Copy result – Click "Copy Output" to copy to clipboard

Example

Input:

{"users":[{"name":"Alice","age":28},{"name":"Bob","age":32}]}

Formatted Output:

{
  "users": [
    {
      "name": "Alice",
      "age": 28
    },
    {
      "name": "Bob",
      "age": 32
    }
  ]
}

Common JSON Errors

  • Missing commas – Objects/arrays need commas between items
  • Trailing commas – JSON doesn't allow commas after last item
  • Unquoted keys – JSON object keys must be in double quotes
  • Single quotes – JSON requires double quotes, not single
  • Mismatched brackets – Every { needs }, every [ needs ]

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