WebServices Press
HomeCode Tools
Small tools. Useful answers.

Your developer workbench.

A lightweight utility for understanding JSON payload size and idealized transfer time.

Developer workbench

A clearer view of your API payload.

Paste JSON to compare its original UTF-8 size with a compact version. Estimate transfer time using your chosen connection speed.

  • Validates JSON syntax
  • Counts bytes, including Unicode
  • Runs entirely in your browser

This estimates uncompressed payload transfer only. Headers, latency, server processing, TLS, and rendering are excluded. It does not measure page load time.

API Payload Calculator

Local tool

Use sample data. Keep credentials and personal information out of the editor. Maximum 200,000 characters.

Transfer estimate = compact bytes × 8 ÷ (Mbps × 1,000,000).