Tools

API Payload Size Analyzer for JSON

Estimate JSON payload size in bytes to monitor API usage and limits.

API Payload Size Analyzer

Estimate JSON payload size so you can stay within API limits and improve performance. This is useful for monitoring bandwidth and optimizing responses.

How to use the API Payload Size Analyzer

  1. Paste your JSON payload.
  2. Click Analyze.
  3. Review the size estimate.

Common use cases

  • Checking payloads against size limits.
  • Comparing response sizes before and after changes.
  • Auditing large fields in APIs.
  • Optimizing mobile or low-bandwidth responses.

Tips & notes

  • Minify JSON to measure the smallest possible payload.
  • Remove unused fields to reduce size.
  • Consider compression at the transport layer.

Related developer tools

  • JSON Minifier
  • JSON Key Usage Analyzer
  • API Response Comparator

FAQ

Is it UTF-8 size?
Yes, uses UTF-8 byte count.
Does whitespace matter?
Yes. Whitespace affects size unless minified.
Can I compare two payloads?
Yes. Run the tool on each payload and compare sizes.