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Data Processing

Uniq By

· Last updated：2026-01-27

Remove duplicates from an array using lodash _.uniqBy with a property path

Details

What this tool helps you do

Remove duplicate values from an array using a property path.

Highlights:

  • Uses lodash _.uniqBy
  • Supports property paths (e.g. id, meta.key)
  • Returns unique values as JSON

Example:

  • Array: [{"id": 1}, {"id": 1}, {"id": 2}]
  • Path: id
  • Result: [{"id": 1}, {"id": 2}]

Execution

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Samples

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Written by the Elysia Tools team
Data Processing130
Array60
Lodash53

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, text
Output type
text
Sample coverage
4
API ready
Yes

Overview

Uniq By is a powerful data processing utility that allows you to efficiently remove duplicate objects from a JSON array based on a specific property path using the reliable lodash _.uniqBy method.

When to use

  • When you need to clean up API responses that contain redundant object entries.
  • When processing large datasets where you must ensure unique records based on a specific ID or key.
  • When you need to filter nested JSON structures by targeting specific property paths.

How it works

  1. 1Paste your JSON array into the input field.
  2. 2Specify the property path (e.g., 'id' or 'user.email') you want to use for comparison.
  3. 3The tool processes the array using lodash _.uniqBy to identify and remove duplicates.
  4. 4Copy or download the resulting unique JSON array.

Use cases

  • Cleaning up user lists by removing duplicate entries with the same email address.
  • Filtering product catalogs to ensure each item ID appears only once.
  • Standardizing configuration files by stripping out redundant settings objects.

Examples

1. Deduplicate User List

Data Analyst

Background

I have a list of users exported from a database, but some users appear multiple times due to system sync errors.

Problem

I need to remove duplicate user objects based on their unique 'email' field.

How to use

Paste the user array into the input and enter 'email' in the Property Path field.

path: 'email'

Outcome

A clean list where each email address appears exactly once.

2. Filter Nested API Response

Frontend Developer

Background

An API endpoint is returning a list of transactions, but some transactions are duplicated with the same 'transaction_id' inside a 'data' object.

Problem

I need to filter the array to keep only unique transactions based on the nested ID.

How to use

Paste the JSON response and use 'data.transaction_id' as the property path.

path: 'data.transaction_id'

FAQ

What does the Property Path field do?

It tells the tool which specific key or nested path to look at when determining if two objects are duplicates.

Can I use nested paths?

Yes, you can use dot notation (e.g., 'meta.id') to target properties nested within objects.

What happens if I leave the Property Path empty?

If no path is provided, the tool will treat the entire object as the value for comparison.

Is this tool case-sensitive?

Yes, the comparison follows standard JavaScript equality rules, meaning 'ID' and 'id' are treated as different values.

Does this tool modify my original data?

No, the tool processes your input and generates a new, unique output; your original data remains unchanged.

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Outcome

A refined array containing only unique transaction records.