JSON Flatten Tool - Flatten Nested JSON Objects

Flatten Options

Separator:

Flatten arrays Preserve null values

Input JSON

Flattened JSON

💡 Usage Tips

Paste your nested JSON and click "Flatten JSON" to convert it
Choose your preferred separator for nested keys (dot, underscore, etc.)
Enable "Flatten arrays" to convert array items to indexed keys
The tool preserves null values and handles circular references
Statistics show the transformation details and depth analysis

📝 Example

Input JSON:
{
  "user": {
    "name": "John",
    "address": {
      "city": "New York",
      "country": "USA"
    }
  },
  "tags": ["admin", "user"]
}

Flattened JSON:
{
  "user.name": "John",
  "user.address.city": "New York",
  "user.address.country": "USA",
  "tags.0": "admin",
  "tags.1": "user"
}