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JSON Key Renamer

Rename keys across nested JSON objects and arrays.

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JSON Key Renamer

JSON Key Renamer helps you rename a field across nested JSON objects and arrays without writing a quick script just for one transformation. Because everything runs locally in your browser, you can clean up payloads, test migrations, and refactor sample data without uploading anything.

Common use cases

  • rename API payload fields
  • standardize object keys across nested data
  • prepare sample data for migrations or mocks

Why this tool is practical

JSON cleanup work often happens in the gap between a one-off copy-paste task and a full development workflow. This tool gives you a focused way to update field names consistently through deeply nested objects and arrays, then inspect the output immediately before you use it elsewhere.

Typical workflow

  1. Paste your JSON input.
  2. Enter the current key and the new key you want to apply.
  3. Review the transformed JSON, then copy or download it for your project.

Browser-side privacy and speed

Keeping the processing local makes this tool useful for internal payloads, test fixtures, exported records, and any data you would rather not send to an external service. JSON Key Renamer is built for fast iteration, cleaner handoffs, and easier debugging when you need a reliable in-browser transformation step.