Developer Tools
Extract JS Object Keys
Extract object literal keys from pasted JavaScript, TypeScript, JSX, or TSX source without executing, compiling, evaluating, or uploading code.
0 / 30,000 characters. No upload, storage, or account required.
JS Object Keys workflows
Use this extractor when copied source needs a browser-local inventory of object shapes before schema reviews, fixture cleanup, API mock handoffs, or migration notes.
Map response fields
Use the extracted key list to compare API mocks against Extract JS Interface Names, Extract JS Type Aliases, or formatted sample payloads in JSON Formatter.
Audit constants
Use Extract JS String Literals, Extract JS Numeric Literals, and Extract JS Variable Names.
Clean copied output
Send extracted rows to Sort Lines, Remove Duplicate Lines, or Normalize Whitespace.
What this tool does
Extract JS Object Keys scans pasted source as text, lists object property keys with source lines, removes duplicates, and runs locally in your browser.
Common use cases
Extract object literal keys from pasted JavaScript, TypeScript, JSX, TSX, config modules, API fixtures, mocked responses, generated code, or copied source before schema audits, migration planning, QA checklists, documentation, or handoffs.
Use Extract JS Object Keys when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Paste JavaScript, TypeScript, JSON-like config, reducers, fixtures, mocked responses, copied snippets, or generated source that contains object literals.
- Choose whether duplicate keys should be removed and whether extracted keys should be normalized for comparison.
- Review extracted object keys with line numbers, then copy the clean list for schema audits, migration notes, QA checklists, documentation, or handoffs.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Extract JS Object Keys runs locally in your browser. Your pasted code is not uploaded, compiled, evaluated, executed, stored, or logged.
Practical notes for this tool
Best use case
Use Extract JS Object Keys when an API mock, fixture file, reducer state, or config object needs a quick field inventory before schema review, docs cleanup, migration notes, or QA handoff.
Inventory API response keys
const user = { id: 123, displayName: "Ari", profile: { timezone: "UTC" } };
const retry = { requestId: "req_9", retryCount: 2 };id displayName profile timezone requestId retryCount
Privacy and local processing
The page scans pasted source as text in your browser. It does not execute objects, compile TypeScript, resolve modules, upload snippets, or store extracted keys.
Limitations to know
- It is a text scanner, not a JavaScript parser.
- Computed keys and unusual syntax may need manual review.
- Do not paste live secrets or private production payloads into browser utilities.
Practical FAQ
When is object-key extraction better than JSON formatting?
Use it when the source is JavaScript or TypeScript and you only need a field inventory. Use JSON Formatter when you have valid JSON and need to inspect the whole structure.
Related workflow links
FAQ
Does Extract JS Object Keys execute JavaScript?
No. It scans pasted source as text and does not execute code, compile TypeScript, evaluate objects, resolve modules, upload, store, or log snippets.
Which keys are included?
It finds common unquoted and quoted object literal keys in pasted JavaScript, TypeScript, JSX, TSX, config, fixture, mock response, and copied-source snippets.
When is this useful?
Use it while reviewing data shapes, fixture fields, API response keys, schema migrations, QA checklists, documentation, release notes, or copied-source handoffs.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.