Keys List

Keys List | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Data Processing
Input types: textarea
Output type: text
Sample coverage: 4
API ready: Yes

Overview

The Keys List tool allows you to instantly extract and list all own enumerable property names from any JSON object using the reliable lodash _.keys method.

When to use

When you need to verify the structure of a complex JSON object.
When you want to extract a list of field names for documentation or mapping purposes.
When you need to programmatically identify available keys in a data payload.

How it works

1Paste your JSON object into the input field.
2The tool processes the input using the lodash _.keys function.
3It filters out inherited properties to return only the object's own enumerable keys.
4The output is returned as a clean, formatted JSON array of strings.

Use cases

Quickly auditing API response schemas to identify available data fields.
Generating a list of column headers based on a sample JSON record.
Debugging data structures by verifying the presence of expected keys.

Examples

1. Extracting User Profile Fields

Frontend Developer

Background

I received a large user profile object from an API and needed to know exactly which fields were available to map them to my UI components.

Problem

The object was too large to scan manually, making it difficult to identify all available data points.

How to use

Paste the user profile JSON into the input field and run the tool.

{"id": 101, "username": "jdoe", "email": "[email protected]", "active": true}

Outcome

The tool returned: ["id", "username", "email", "active"].

2. Validating Configuration Keys

System Administrator

Background

I have a configuration file in JSON format and need to ensure all required keys are present before deploying.

Problem

Manually checking for missing keys in a nested configuration is prone to human error.

How to use

Input the configuration object to get a flat list of all top-level keys.

FAQ

What does 'own enumerable keys' mean?

It means the tool only lists properties defined directly on the object itself, ignoring properties inherited through the prototype chain.

Can I process nested objects?

Yes, the tool will return the top-level keys of the provided JSON object.

Is the output format always a JSON array?

Yes, the result is consistently returned as a JSON array of strings representing the keys.

Does this tool modify my original data?

No, the tool only reads your input to extract the keys; your original data remains unchanged.

What happens if the input is not valid JSON?

The tool requires a valid JSON object to function correctly; invalid syntax will result in an error.

{"host": "localhost", "port": 8080, "debug": false, "retries": 3}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Extracting User Profile Fields

2. Validating Configuration Keys

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