Analyze JSON structure depth, key count, and byte size. JSON Size Analyzer is a free online tool from the ToolsRift JSON Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Paste your JSON and the analyzer reports total bytes, number of keys, maximum nesting depth and a breakdown of value types.
Total byte size, key and value counts, maximum nesting depth and the mix of strings, numbers, arrays and objects.
Smaller payloads load faster and cost less bandwidth. Knowing the size helps you decide whether to minify or restructure.
Not always — multi-byte UTF-8 characters take more than one byte, so the analyzer measures true encoded size.