Tools

JSON Key Usage Analyzer for Unused Fields

Find unused JSON keys by comparing data against a usage list.

JSON Key Usage Analyzer

Compare a JSON payload to a list of used keys to spot unused fields quickly. This is helpful when cleaning APIs, reducing payload size, or refactoring data models.

How to use the JSON Key Usage Analyzer

  1. Paste the JSON data.
  2. Provide the list of used keys.
  3. Click Analyze to see unused fields.

Common use cases

  • Removing unused fields from API responses.
  • Auditing payloads before versioning changes.
  • Reducing JSON size for performance.
  • Aligning backend output with frontend usage.

Tips & notes

  • Use dot notation for nested keys like user.name.
  • Keep your used-key list versioned with code.
  • Validate results against real usage analytics when possible.

Related developer tools

  • JSON Schema Generator
  • API Payload Size Analyzer
  • JSON Formatter

FAQ

How to provide used keys?
List keys one per line.
Does it handle nested keys?
Yes, nested paths can be provided in dot notation.
Will it modify my JSON?
No. It only reports unused keys.