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Data Processing

Uniq Array

· Last updated：2026-01-27

Remove duplicates from an array using lodash _.uniq

Details

What this tool helps you do

Remove duplicate values from a JSON array.

Highlights:

  • Uses lodash _.uniq
  • Keeps the first occurrence of each value
  • Returns unique values as JSON

Example:

  • Array: [1, 2, 2, 3]
  • Result: [1, 2, 3]

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

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
Output type
text
Sample coverage
4
API ready
Yes

Overview

The Uniq Array tool allows you to quickly clean your data by removing duplicate entries from any JSON array. Powered by the reliable lodash _.uniq method, it ensures your datasets remain concise by preserving only the first occurrence of each value.

When to use

  • When you need to sanitize a list of IDs or tags by removing redundant entries.
  • When preparing data for API requests that require unique identifiers.
  • When you want to quickly verify the unique items present in a large JSON dataset.

How it works

  1. 1Paste your JSON array into the input field.
  2. 2The tool processes the array using the lodash _.uniq function.
  3. 3The system automatically filters out all subsequent duplicate values.
  4. 4The resulting unique JSON array is displayed for immediate use.

Use cases

  • Cleaning up user-provided input lists to prevent duplicate database entries.
  • Normalizing configuration arrays where only unique settings are permitted.
  • Preparing clean datasets for frontend dropdown menus or selection lists.

Examples

1. Cleaning User ID Lists

Data Analyst

Background

A marketing team provided a list of user IDs that contains several accidental duplicates due to manual entry errors.

Problem

The system requires a unique list of IDs to process a targeted email campaign without sending multiple messages to the same user.

How to use

Paste the raw list of IDs into the Array input field and run the tool.

[101, 102, 101, 103, 102, 104]

Outcome

The tool returns [101, 102, 103, 104], providing a clean list ready for the campaign.

2. Removing Duplicate Tags

Content Manager

Background

A blog post has a collection of tags that were added over time, resulting in repeated keywords.

Problem

The tag cloud component on the website displays redundant labels, which looks unprofessional.

How to use

Input the array of tags into the tool to filter out the repetitions.

FAQ

What happens to the duplicate values?

Duplicate values are removed, and only the first occurrence of each unique item is kept in the final output.

Does this tool support nested objects?

This tool is designed for standard JSON arrays of primitives. For complex nested objects, ensure your input is a valid flat array.

Is the order of elements preserved?

Yes, the tool maintains the original order of the first occurrences while stripping away any subsequent duplicates.

What library does this tool use?

This tool utilizes the industry-standard lodash _.uniq method to ensure accurate and efficient deduplication.

Is my data stored on your servers?

No, all processing is performed locally in your browser to ensure your data remains private and secure.

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The tool outputs ["tech", "news", "design"], allowing for a clean and organized tag display.