'JSON Key Extractor scans JSON data and extracts field names, nested paths, and unique keys instantly. It is useful for inspecting unknown JSON structures, checking API responses, reviewing payload schemas, and preparing field lists for development or data work.', 'howto' => [ 'Paste valid JSON into the input area.', 'Choose whether to extract top-level keys only or full nested key paths.', 'Choose whether array indexes should be included in extracted paths.', 'Click Extract Keys to analyze the JSON structure.', 'Copy the extracted keys or download them as a TXT file if needed.' ], 'why' => 'JSON Key Extractor helps developers understand JSON structure quickly without manually inspecting large responses. It is useful for APIs, debugging, data mapping, field documentation, schema review, and integration work.', 'faq' => [ [ 'q' => 'What does JSON Key Extractor do?', 'a' => 'It extracts key names and nested key paths from valid JSON data so you can inspect structure more easily.' ], [ 'q' => 'Can it extract nested keys?', 'a' => 'Yes. You can choose full nested paths to see deeply nested fields.' ], [ 'q' => 'Can it handle arrays?', 'a' => 'Yes. You can choose whether to include array indexes in the extracted paths or keep array paths generalized.' ], [ 'q' => 'Does it validate JSON too?', 'a' => 'It requires valid JSON input. If the JSON is invalid, the tool shows an error instead of extracting keys.' ], [ 'q' => 'Is JSON Key Extractor free to use?', 'a' => 'Yes. You can use this online tool for free.' ] ] ]; include_once $_SERVER['DOCUMENT_ROOT'] . '/inc/tools/related-tools-helper.php'; $relatedTools = getAutoRelatedTools($toolSlug, $toolCategory, 5); include_once $_SERVER['DOCUMENT_ROOT'] . "/inc/header.html"; ?>

Free Online Developer Tools

Format, validate, extract, convert, and inspect structured data quickly for real development work.
Developer Tools

JSON Key Extractor

Extract JSON keys and nested field paths instantly for API inspection, debugging, and schema review.

Extract keys from JSON

Result

Status Ready
Total Keys 0
Unique Keys 0
Max Depth 0
Mode Full key paths
Array Style Use []
Processing Result
Waiting for JSON input
No extracted keys yet