JSON key extractor online

A json key extractor walks nested objects and arrays to collect property names at the depths you choose. Instead of expanding every branch in an editor, you paste once and receive a deduplicated list of keys — the fastest way to json get all keys when onboarding to a new API or auditing an export.

This json key extractor online focuses on names, not values. You learn which fields exist — user, email, meta.version — without copying sample data into tickets. Pair it with our JSON Value Extractor when you also need example scalars from the same document.

Extraction is not schema validation. Listing keys does not prove types, required status, or data quality. It is a discovery step before you write OpenAPI stubs, JSON Schema drafts, or migration checklists.

Because processing is local, you can safely run the json key extractor on production-shaped fixtures from VPN-only environments without sending bytes to a cloud formatter.

Paste valid JSON into the source panel. Extracted keys appear automatically in the output column — no run button required. Adjust depth to limit which nesting levels contribute: asterisk for everything, a single number for one level, or a range like 2-5 for middleware layers only.

Choose a separator that fits your next step — new lines for a text file, tabs for spreadsheet paste, commas for inline lists. Copy with one click or download extracted-keys.txt for diffing in version control.

Import a .json or .txt file when the payload is too large to paste reliably from a terminal. Clear both panels when finished on a shared machine if the document contained sensitive field names.

Invalid JSON shows a parse error in the output panel. Fix syntax in our JSON Editor or Formatter, then return to extract keys from the corrected text.

Root depth is 1 — top-level properties on the outer object. Child objects increment depth. Filtering to depth 2 might list keys on the root and their immediate children while skipping deeper grandchildren.

The json key extractor deduplicates identical key strings in the result list. The same name appearing at different depths still counts once in the unique total when the string matches exactly — useful when many array elements repeat the same shape.

Arrays of objects contribute keys found inside each element. Homogeneous arrays often repeat the same key set; deduplication keeps the inventory short. Heterogeneous arrays may introduce rare keys you would miss by reading only the first element.

Null values do not remove keys — if a parent object declares a field, the name appears even when the value is null.

API integration: collect sample responses from staging, extract keys from each endpoint, and merge into a master field catalog before writing client models.

Security review: scan inventories for tokens like password, ssn, or token that should not appear in client-side logs or analytics payloads.

Data migration: compare key lists between schema versions to document renames and removals before ETL jobs run.

QA fixtures: verify that test JSON includes expected property names after a backend deploy without manually opening nested trees.

After you json get all keys, run JSON Value Extractor on the same paste to sample scalar values and confirm types look reasonable.

Validate a document against JSON Schema once you know which properties matter. Use JSON Compare when you need full structural diff, not just name lists.

Format messy input with JSON Formatter first if the paste came minified from a log aggregator — readability helps when you cross-check names against source.

Typical API responses extract instantly in the browser. Multi-megabyte logs with thousands of unique paths may take longer and produce very long lists — filter by depth or sample a subtree when possible.

The json key extractor online never uploads your paste. That matters for HR exports, financial configs, and unreleased product JSON copied from private networks.

Keys alone do not show value shapes — booleans, enums, and PII types require the value extractor or manual inspection. Invalid JSON must be fixed before any keys appear.