JSON Size Analyzer

Analyze JSON structure to find the largest keys and most space-consuming nodes.

Runs entirely in your browser — nothing is uploaded or stored on any server.

About JSON Size Analyzer

Updated Mar 2026

Paste any JSON object to analyze its structure and find which keys, arrays, and nested objects take up the most space. Shows a sorted table of all nodes with their path, type, size in bytes, and a visual bar. Helps identify bloated fields when optimizing API responses or reducing payload sizes.

Frequently Asked Questions

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