Assign Object

Assign Object | 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 Assign Object tool allows you to efficiently merge source properties into a target JSON object using the lodash _.assign method, ensuring that later sources override any conflicting properties from earlier ones.

When to use

When you need to update a base configuration object with new values from multiple sources.
When you want to consolidate several JSON objects into a single, unified data structure.
When you need to apply property overrides programmatically without manually editing complex JSON files.

How it works

1Input your base JSON structure into the Target Object field.
2Add your source objects into the provided Source fields.
3The tool processes the inputs using lodash _.assign, where subsequent sources take precedence over previous ones.
4Retrieve the final merged JSON object as the output.

Use cases

Merging default application settings with user-specific overrides.
Combining partial data fragments from different API responses into a single record.
Updating state objects in a predictable, sequential manner.

Examples

1. Updating User Profile Settings

Frontend Developer

Background

A user profile object needs to be updated with new preferences received from a settings form.

Problem

Manually merging the base profile with new settings is error-prone.

How to use

Paste the current profile into Target Object and the new settings into Source 1.

Target: {"theme": "light", "notifications": true}, Source 1: {"theme": "dark"}

Outcome

The resulting object is {"theme": "dark", "notifications": true}.

2. Consolidating Configuration Layers

DevOps Engineer

Background

An application requires a base configuration that is extended by environment-specific overrides.

Problem

Need to ensure production overrides correctly replace development defaults.

How to use

Place base config in Target, environment defaults in Source 1, and specific overrides in Source 2.

FAQ

What happens if two sources have the same key?

The value from the source that appears later in the input sequence will overwrite the value from the earlier source.

Does this tool perform a deep merge?

No, this tool uses lodash _.assign, which performs a shallow assignment of own enumerable properties.

What format should the input objects be in?

Inputs must be valid JSON objects enclosed in curly braces.

Are non-enumerable properties included?

No, only the source object's own enumerable properties are assigned to the target.

Can I use this to merge more than two objects?

Yes, you can provide a target object and up to three additional source objects to be merged in sequence.

Target: {"port": 8080, "debug": true}, Source 1: {"port": 3000}, Source 2: {"debug": false}

What this tool helps you do

Run this tool

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Inputs

Result

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. Updating User Profile Settings

2. Consolidating Configuration Layers

FAQ

Grafana Advanced Application Samples

QR Code Samples

D3.js Data Visualization Samples

Rome JavaScript Toolchain Samples

Defaults Object

From Pairs

Fill Array

Flatten Depth Array

JSON Interchange and Format Translation Tools

JSON Inspection, Diff, and Transformation Tools

JSON Schema, Mock Data, and API Fixture Generators

JSON Formatting, Diff, and Normalization Tools