JSON Size Analyzer — Analyze JSON Structure & Size

Analyze your JSON data — key count, nesting depth, array sizes, data types, and byte size. Get detailed structural insights instantly. 100% client-side.

Input JSON0 chars
Analysis Results
Press Analyze to see results
🛡️Zero server logs. Analysis runs 100% inside your browser.
🛠️Developer Tool Belt
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JSON Size Analyzer — Analyze JSON Structure & Size

Analyze your JSON data — key count, nesting depth, array sizes, data types, and byte size. Get detailed structural insights instantly. 100% client-side.

🔒 Client-side only⚡ Web Worker processing🌐 Works offline🛡️ Zero server logs

How to Use

  1. Paste your JSON data into the input editor.
  2. View instant analysis including total keys, nesting depth, array counts, byte size, and type distribution.
  3. Use the insights to optimize your JSON structure or debug data issues.

Frequently Asked Questions

Questions about this tool? We've got answers.

What metrics are reported?

Total keys, maximum nesting depth, array count and sizes, string/number/boolean/null distribution, total byte size, and a detailed breakdown of each top-level key.

Can it analyze large JSON files?

Yes. Since the analysis runs entirely in your browser, it can handle files up to several megabytes. The Web Worker ensures the UI stays responsive.

Is my data sent to a server?

No. All analysis runs 100% inside your browser via a Web Worker.

Automated E2E Test Suite Logs

Our build systems validate edge-case processing under extreme conditions before each deployment.

Stability
100.0%
Passed
21/21
Env
V8-Sandbox
Engine: Vitest RunnerUpdated: 2026/6/11 00:18:12📦 Download Test Datasets
PASSanalyzeJsonSize analyzes simple object
PASSanalyzeJsonSize analyzes nested object
PASSanalyzeJsonSize analyzes arrays
PASSanalyzeJsonSize analyzes empty object
PASSanalyzeJsonSize analyzes null and primitive values
PASSanalyzeJsonSize analyzes top-level array
PASSanalyzeJsonSize throws on empty input
PASSanalyzeJsonSize throws on invalid JSON
PASSJsonSizeAnalyzerTool renders Analyze button
PASSJsonSizeAnalyzerTool renders Input JSON and Analysis Results labels
PASSJsonSizeAnalyzerTool renders a textarea
PASSJsonSizeAnalyzerTool shows Load URL button
PASSJsonSizeAnalyzerTool shows privacy strip
PASSJsonSizeAnalyzerTool shows error toast on Analyze with empty input
PASSJsonSizeAnalyzerTool shows placeholder text before analysis
PASSJSON Size Analyzer Worker Standard analysis operations should analyze simple JSON
PASSJSON Size Analyzer Worker Standard analysis operations should analyze nested JSON
PASSJSON Size Analyzer Worker Standard analysis operations should analyze array JSON
PASSJSON Size Analyzer Worker Boundary Conditions & Error Handling should return error for invalid JSON
PASSJSON Size Analyzer Worker Boundary Conditions & Error Handling should return error for empty input
PASSJSON Size Analyzer Worker Performance Benchmark should analyze large JSON within acceptable limits
⏱️ 0.18ms📦 1.5KB🎚️ Max Nesting: 3🌿 AST Nodes: 48🛡️ V8 Heap: Healthy
$ codecaven-validator --scope=tool● CLUSTER COMPLIANT

Tool Changelog & Updates

1.0.02026-06-10
  • Feature: Initial release