Tiny Online Tools logoTiny Online ToolssearchSearch tools…grid_viewAll Tools
Homechevron_rightData Toolschevron_rightJSON Key RenamerJSON Key Renamer

JSON Key Renamer

Rename keys across nested JSON objects and arrays.

Similar Tools

JSON Sorter

JSON Sorter

Sort JSON keys alphabetically for cleaner diffs and easier review.

JSON Key Extractor

JSON Key Extractor

Select which keys to include or exclude from a JSON array of objects.

JSONL to JSON

JSONL to JSON

Convert JSON Lines into a standard JSON array.

JSON Path Finder

JSON Path Finder

Find values in JSON documents with a practical JSONPath subset.

Frequency Analyzer

Frequency Analyzer

Real-time audio frequency analyzer for your microphone. Visualize the spectrum live with FFT in your browser.

UUID Validator

UUID Validator

Validate UUIDs and detect version, variant, and normalized form.

ICO to PNG

ICO to PNG

Extract PNG images from ICO icon files and download individual sizes.

apps

More Tools

Browse our full collection of free online tools.

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.