JSON Structure Analyzer

What is the JSON Structure Analyzer?

The JSON Structure Analyzer examines your JSON content and reports quantitative metrics about its overall structure. It counts objects, arrays, and keys, determines the maximum nesting depth, and detects potential issues such as repeated keys, inconsistent types within arrays, and oversized arrays — giving you a bird's-eye view of JSON complexity without interactive navigation.

How to Use

1. Paste your JSON content in the input area
2. The analysis runs automatically as you type
3. Review the statistics panel showing counts and depth
4. Check the issues section for potential problems
5. Click "Copy Results" to copy the analysis summary

Use Cases

• API response profiling — Quickly assess the complexity of API payloads before processing them
• Schema design review — Identify overly nested structures that may indicate design issues
• Data quality checks — Detect repeated keys that cause silent data loss during parsing
• Performance estimation — Large array counts and deep nesting can indicate potential performance bottlenecks
• Migration planning — Understand the structure of JSON data before converting to another format

Example: Analyzing an API Response

Given a typical REST API response with nested data:

{
  "data": {
    "users": [
      { "id": 1, "name": "Alice", "roles": ["admin", "editor"] },
      { "id": 2, "name": "Bob", "roles": ["viewer"] }
    ],
    "pagination": { "page": 1, "total": 42, "perPage": 10 }
  },
  "status": "success"
}

The analyzer reports: 6 objects, 3 arrays, 13 keys, max depth 4, and no issues detected. This tells you the response is moderately nested with a manageable structure.

Detected Issue Types

• Repeated keys — Keys that appear more than once in the same object. Most JSON parsers silently discard all but the last value, causing unexpected data loss.
• Inconsistent types — Arrays containing mixed element types (e.g., strings and numbers together). While valid JSON, this can cause issues with typed languages and schema validation.
• Oversized arrays — Arrays with more than 100 elements. This is informational and suggests the data might benefit from pagination or streaming.

Privacy and Security

All analysis happens entirely in your browser using JavaScript. Your JSON content is never transmitted to any server. No data is stored, logged, or shared.