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.

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

Paste your JSON data into the input editor.
View all extracted keys, paths, and their data types organized in a hierarchical tree.
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: 2026/7/16 02:08:13📦 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

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 key extraction from simple JSON, nested objects, and array structures.
Test: Introduced error validation for malformed JSON and empty object handling.
Performance: Included large JSON (4MB+) stress benchmark with key extraction throughput and memory telemetry.

1.0.02026-06-10

Feature: Initial release