Free JSON size analyzer to calculate bytes, character count, structure depth, and compression estimates. Validate JSON syntax and see detailed breakdown of your data.
You might also find these calculators useful
Understanding your JSON data size is crucial for API optimization, storage planning, and network performance. Our calculator analyzes size, structure depth, and provides compression estimates for your JSON payloads.
JSON size is measured in bytes using UTF-8 encoding. The size depends on your data content, formatting (whitespace), and structure complexity. Minifying removes unnecessary whitespace, while gzip compression can reduce transfer size by 60-90%.
JSON Size Formula
Size (bytes) = UTF-8 encoded string lengthReduce payload sizes to improve API response times and reduce bandwidth costs.
Estimate database storage needs for JSON documents.
Understand data transfer costs for mobile and low-bandwidth scenarios.
Analyze REST API payloads to optimize response sizes.
Check config file sizes before deployment.
Estimate export file sizes for large datasets.
Ensure JSON data fits within browser storage limits (usually 5-10 MB).
The estimate is approximate. Actual gzip compression varies based on data content, but JSON typically compresses to 10-40% of original size. Test with actual gzip for precise results.