Free JSON Key Extractor
for developers.
Extract JSON keys and nested paths instantly in your browser. Great for API payload inspection, schema discovery and debugging complex objects.
Paste your JSON
Extracted key paths
Total key paths
0
Extracted keys will appear here.How it works
- Reads JSON objects and arrays
- Extracts nested paths automatically
- Supports dot notation and array indexes
- Can collapse arrays into [] notation for cleaner output
- Useful for API inspection and debugging
Useful for
- Inspecting API responses
- Finding nested fields quickly
- Documenting JSON structures
- Debugging object shapes in development
Privacy
- Your JSON stays in the browser
- No upload, no signup, no server processing
Free online JSON key extractor
This tool helps you extract JSON keys and nested paths directly in your browser. It is useful when working with API payloads, complex objects, schema exploration and debugging workflows.
Instead of manually inspecting every level of a JSON object, you can paste the payload once and instantly get a clean list of available keys and paths.
It is especially helpful when dealing with large nested responses from APIs and services.
Example
{
"user": {
"profile": {
"firstName": "John"
}
}
}This produces paths such as user, user.profile and user.profile.firstName.
Why use a JSON key extractor?
JSON structures can get deeply nested very quickly. A JSON key extractor makes it much faster to inspect field names, understand payload structure and identify the paths you need.
It is especially useful when mapping API responses into frontend or backend code.
FAQ
Does this support nested JSON?
Yes. Nested objects and arrays are supported and the full key paths are extracted.
How are arrays shown?
Arrays can be shown with collapsed notation like items[].name or with exact indexes like items[0].name.
Can I copy all extracted keys?
Yes. Use the copy button to copy the full list of extracted key paths.
Is this JSON key extractor safe?
Yes. Everything runs locally in your browser and your JSON is not uploaded.
More developer tools
DevWrench provides a growing collection of browser-based developer tools including JSON utilities, converters, encoders, and debugging helpers. Browse them below.