Find Key

Find Key | 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, select, text
Output type: text
Sample coverage: 4
API ready: Yes

Overview

Find Key is a precise utility tool designed to identify the first key in a JSON object that satisfies a specific condition using the lodash _.findKey method.

When to use

When you need to locate the first occurrence of a key based on a specific property value.
When filtering complex JSON structures to find an entry that matches a nested object pattern.
When you need to verify if any item in a collection meets a criteria and retrieve its identifier.

How it works

1Paste your JSON object into the input field.
2Select the predicate type that best fits your search criteria: Property, Matches Property, or Matches Object.
3Define the specific property name, path, or object structure to match.
4Execute the tool to return the first matching key or null if no match is found.

Use cases

Identifying the ID of the first user in a database export who has an 'active' status set to true.
Locating the configuration key that matches a specific set of nested settings.
Quickly finding a product SKU in a large inventory object based on a specific attribute match.

Examples

1. Find Active User ID

Developer

Background

You have a large JSON object containing user profiles and need to find the first user who is currently active.

Problem

Manually scanning a large JSON file to find the first active user is error-prone.

How to use

Input the user object, select 'Property' as the predicate type, and set the property name to 'active'.

predicateType: 'property', predicateProperty: 'active'

Outcome

The tool returns the key of the first user object where 'active' is true.

2. Match Nested Configuration

System Administrator

Background

You have a complex configuration object and need to find which module has a specific 'enabled' setting.

Problem

The configuration is deeply nested, making it difficult to identify the module key manually.

How to use

Use the 'Matches Object' predicate type and provide the target object structure.

FAQ

What library does this tool use?

This tool utilizes the lodash _.findKey function to perform searches.

What happens if no key matches the criteria?

The tool will return null.

Can I search for nested properties?

Yes, by using the 'Matches Property' predicate type and providing the correct path.

Does it return all matching keys?

No, it only returns the first key that satisfies the provided predicate.

Is the input format strictly JSON?

Yes, the input must be a valid JSON object.

predicateType: 'matchesObject', matchObject: '{"enabled": true}'

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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. Find Active User ID

2. Match Nested Configuration

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