JSON Key Extractor — Extract All Keys & Paths

Extract all keys, paths, and their types from JSON objects recursively. Perfect for understanding data structure, generating documentation, and mapping API responses. 100% client-side.

Input JSON0 chars
Extracted Keys (0)
Output:
Press Extract Keys to see results
🛡️Zero server logs. Extraction runs 100% inside your browser.
🛠️Developer Tool Belt
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JSON Key Extractor — Extract All Keys & Paths

Extract all keys, paths, and their types from JSON objects recursively. Perfect for understanding data structure, generating documentation, and mapping API responses. 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 all extracted keys, paths, and their data types organized in a hierarchical tree.
  3. Copy the key list for documentation, data mapping, or schema design.

Frequently Asked Questions

Questions about this tool? We've got answers.

What information is extracted?

Every unique key path with its full dot-notation path, data type, sample value, and array depth. Results are presented in a sortable, hierarchical view.

Does it handle deeply nested data?

Yes. The extractor recursively traverses all nesting levels, including arrays, to produce a complete map of every reachable key path.

Is my data sent to a server?

No. All extraction 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
20/20
Env
V8-Sandbox
Engine: Vitest RunnerUpdated: 2026/6/11 00:18:12📦 Download Test Datasets
PASSextractKeys extracts flat keys
PASSextractKeys extracts nested keys with paths
PASSextractKeys extracts keys from array items
PASSextractKeys returns no keys for empty object
PASSextractKeys extracts non-flattened unique keys
PASSextractKeys throws on empty input
PASSextractKeys throws on invalid JSON
PASSJsonKeyExtractorTool renders Extract Keys button
PASSJsonKeyExtractorTool renders Input JSON and Extracted Keys labels
PASSJsonKeyExtractorTool renders two textareas
PASSJsonKeyExtractorTool shows Load URL button
PASSJsonKeyExtractorTool shows privacy strip
PASSJsonKeyExtractorTool shows error toast on Extract Keys with empty input
PASSJsonKeyExtractorTool shows placeholder before extraction
PASSJSON Key Extractor Worker Standard extraction operations should extract keys from simple JSON
PASSJSON Key Extractor Worker Standard extraction operations should extract keys from nested JSON
PASSJSON Key Extractor Worker Standard extraction operations should extract keys from array JSON
PASSJSON Key Extractor Worker Boundary Conditions & Error Handling should return error for invalid JSON
PASSJSON Key Extractor Worker Boundary Conditions & Error Handling should handle empty object gracefully
PASSJSON Key Extractor Worker Performance Benchmark should extract keys from 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