How to use this tool
- Paste JSON, upload a local file, or load a CORS-enabled public URL.
- Choose the formatted indentation baseline and run Analyze JSON size.
- Review the result, then copy it or download it with the correct file type.
Private by default
JSON Size Analyzer and Structure Report
Inspect payload weight and structural complexity before storing, reviewing, or transporting JSON.
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UTF-8Ln 1, Col 1
UTF-8—
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PrivateBrowser-side processing
AuditableDocumented semantics
PortableCorrectly typed downloads
Category
JSON Size Analyzer: How to use this tool
Measure exact UTF-8 source, formatted, and minified byte sizes together with savings, node, key, depth, object, and array counts.
Inspect payload weight and structural complexity before storing, reviewing, or transporting JSON.
Open guide and examples
Example to try
Input JSON
{
"message": "नमस्ते JSON 👋",
"records": [
{"id": 101, "active": true, "tags": ["api", "public"]},
{"id": 102, "active": false, "tags": ["batch"]}
],
"metadata": {
"region": "ap-south-1",
"retry": null
}
}Result
{
"bytes": {
"sourceUtf8": 246,
"formattedUtf8": 334,
"minifiedUtf8": 194,
"minifiedSizeChange": -52,
"minifiedSizeChangePercent": -21.14,
"minifiedSavings": 52,
"minifiedSavingsPercent": 21.14
},
"structure": {
"nodes": 17,
"keys": 11,
"maxDepth": 5,
"objects": 4,
"arrays": 3,
"primitiveValues": 10
}
}Learn
Frequently asked questions
Does this tool upload my JSON?
No. The transformation runs in your browser. URL import contacts only the address you explicitly enter.
What happens when the JSON is invalid?
The editor marks the likely location and keeps stale output out of the result pane.
What does JSON Size Analyzer produce?
It emits a typed JSON report with byte metrics, minification savings, container counts, primitive count, and maximum depth.
What limitation applies to JSON Size Analyzer?
Formatted and minified sizes preserve number and string token spelling while normalizing whitespace; duplicate object names are rejected because structural counts would be ambiguous.