JSON API Formatter – Standardize API Responses
Format JSON API responses into a consistent, readable structure following best practices. Our free JSON API Formatter helps teams maintain uniform response formats across all endpoints.
About JSON API Formatter
Inconsistent API responses make frontend code messy with scattered null checks and property mapping. This tool transforms any JSON response into a standardized structure with success, data, error, and meta fields that your frontend can rely on.
How it works
Paste your raw API response JSON and click Format. The tool identifies common response patterns like status, result, data, and message fields, then reorganizes them into a consistent structure.
The output includes a success boolean, data field for the main payload, error field for any issues, and a meta object with timestamp, version, and requestId. Pagination data is preserved if present.
When you'd use this
You're building a new API and want to establish a consistent response format from the start. Test different response structures here to see how they'd look in your standardized format.
This is a formatting tool, not a validation tool. It reorganizes your JSON but doesn't enforce strict schemas. For production APIs, consider using a response serialization library instead.
Questions
What fields does the formatted output include?
The output has success, data, error, and meta fields. Meta includes timestamp, version, and requestId for tracking.
How is success determined?
If your JSON has a success field, that value is used. Otherwise it checks if status equals "success". The result defaults to true if neither exists.
What happens to pagination data?
If your response includes a pagination field, it's preserved in the formatted output alongside the standard fields.
Can I customize the output format?
This tool uses a fixed standard format. For custom formats, you'd need to write your own transformation logic or use a different tool.
Is this suitable for production use?
This is a development and testing tool. For production, implement response formatting in your API code using middleware or serializers.