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.

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

Paste your JSON data into the input editor.
View instant analysis including total keys, nesting depth, array counts, byte size, and type distribution.
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: 2026/7/16 02:08:13📦 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

v1.2.02026-06-12

UX: Updated About descriptions, How-to guides, and FAQ sections with detailed multi-language content.
UX: Added Load URL button via shared LoadUrlModal component for remote JSON loading.
Fix: Fixed i18n key names to match component usage — corrected "convert" to "generate"/"flatten"/"unflatten"/"merge" as appropriate.

1.1.02026-06-11

Feature: Added Web Worker thread-isolated test suite covering size analysis of simple JSON, nested objects, and array structures.
Test: Introduced error validation for malformed JSON and empty input handling.
Performance: Included large JSON (4MB+) stress benchmark with size analysis throughput and memory telemetry.

1.0.02026-06-10

Feature: Initial release