Does it validate invalid JSON responses?

Yes, it detects JSON syntax errors and highlights broken formatting.

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API Response Formatter

Prettify API payloads, check status code categories, and analyze byte size.

How to Use API Response Formatter

1Paste your raw API JSON response into the editor.
2Optionally enter the HTTP Status Code (e.g. 200, 404).
3View the formatted JSON, payload size in KB, and key metrics.

Key Features & Benefits

Prettifies raw and minified API JSON responses
HTTP status code categorization (2xx Success, 4xx Client Error, etc.)
Calculates payload size in Bytes and Kilobytes
Top-level keys counter and syntax validator

About API Response Formatter

Clean, format, and inspect REST and GraphQL API responses. Validates JSON syntax, analyzes payload byte size, counts top-level keys, and displays status code categories (2xx, 4xx, 5xx).

Unlike traditional web tools that send your personal data, uploaded photos, or sensitive text to remote cloud servers, our API Response Formatter operates strictly inside your client browser sandbox. This guarantees high processing speeds without network throttling, and ensures your data privacy is completely preserved.

Frequently Asked Questions

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Developer ToolsPopular Tool100% In-Browser & Private

API Response Formatter

Prettify API payloads, check status code categories, and analyze byte size.

HTTP Status:

200 2xx SuccessSize: 128 B

Raw Payload

Formatted API Response

{
  "status": "success",
  "code": 200,
  "data": {
    "user": {
      "id": "usr_102",
      "username": "alexsmith",
      "roles": [
        "admin",
        "editor"
      ]
    },
    "active": true
  }
}

How to Use API Response Formatter

1Paste your raw API JSON response into the editor.
2Optionally enter the HTTP Status Code (e.g. 200, 404).
3View the formatted JSON, payload size in KB, and key metrics.

Key Features & Benefits

Prettifies raw and minified API JSON responses
HTTP status code categorization (2xx Success, 4xx Client Error, etc.)
Calculates payload size in Bytes and Kilobytes
Top-level keys counter and syntax validator

About API Response Formatter

Clean, format, and inspect REST and GraphQL API responses. Validates JSON syntax, analyzes payload byte size, counts top-level keys, and displays status code categories (2xx, 4xx, 5xx).