Private / No Upload

Format a JSON file privately

Paste JSON, validate syntax, format it with readable indentation, then copy the cleaned file back to your editor.

Runs in your browser

HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

No upload

HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

No account

HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

Steps

  1. 1 Paste the JSON into the private JSON formatter.
  2. 2 Fix parser errors such as trailing commas or unquoted keys.
  3. 3 Click Format code and review the output.
  4. 4 Copy the formatted JSON back to your file.

Before

Compact JSON becomes easier to review.

{"user":{"id":1,"name":"Ada"},"active":true}

Output

{
  "user": {
    "id": 1,
    "name": "Ada"
  },
  "active": true
}

After

Formatted JSON keeps the same values with clearer whitespace.

{
  "user": {
    "id": 1,
    "name": "Ada"
  },
  "active": true
}

Output

Readable JSON file

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