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Assign In Object

Assign own and inherited properties using lodash _.assignIn

Assign own and inherited enumerable properties from sources to the target.

Highlights:

  • Uses lodash _.assignIn
  • Includes inherited enumerable properties
  • Later sources override earlier ones

Example:

  • Target: {"a":1}
  • Source 1: {"b":2}
  • Source 2: {"a":3}
  • Result: {"a":3,"b":2}

Enter the target JSON object

First source object

Optional source object

Optional source object

Key Facts

Category
Data Processing
Input Types
textarea
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

The Assign In Object tool allows you to merge multiple JSON objects into a single target object by leveraging the lodash _.assignIn method, which includes both own and inherited enumerable properties.

When to Use

  • •When you need to merge configuration objects that include inherited properties.
  • •When you want to update a base object with values from multiple source objects.
  • •When you need to ensure that later source objects override properties defined in earlier ones.

How It Works

  • •Enter your base JSON object into the Target Object field.
  • •Provide one or more source objects in the available source fields.
  • •The tool processes the inputs using lodash _.assignIn to combine all properties.
  • •The resulting merged JSON object is displayed as the output.

Use Cases

Merging default application settings with user-defined overrides.
Combining data structures from different modules that share a common prototype.
Flattening multiple configuration layers into a single object for easier access.

Examples

1. Merging Configuration Layers

Developer
Background
A developer has a default configuration object and needs to apply environment-specific overrides.
Problem
Manually combining multiple JSON objects is error-prone and tedious.
How to Use
Input the base config as the target and the environment overrides as the source objects.
Example Config
Target: {"theme": "light", "retries": 3}; Source 1: {"retries": 5}; Source 2: {"debug": true}
Outcome
A single object: {"theme": "light", "retries": 5, "debug": true}

2. Combining User Profiles

Background
Merging a base user template with specific user-provided data fields.
Problem
Need to ensure that user-provided data takes precedence over default template values.
How to Use
Place the template in the target field and the user-specific data in the source fields.
Example Config
Target: {"role": "guest", "active": false}; Source 1: {"role": "admin", "active": true}
Outcome
A merged object: {"role": "admin", "active": true}

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FAQ

What is the difference between this and a standard merge?

This tool uses lodash _.assignIn, which specifically includes inherited enumerable properties, unlike standard shallow merges that only look at own properties.

What happens if multiple sources have the same key?

Later sources override earlier ones. If Source 1 and Source 2 both define the same key, the value from Source 2 will be present in the final result.

Does this tool modify the original objects?

No, the tool performs the operation and returns a new JSON object without altering your original input data.

Can I use this for nested objects?

This tool performs a shallow assignment. Nested objects will be replaced entirely by the corresponding value in the source object rather than being merged recursively.

What if my input is not valid JSON?

The tool requires valid JSON syntax. If the input is malformed, the tool will be unable to parse the objects and will return an error.

API Documentation

Request Endpoint

POST /en/api/tools/assign-in-object

Request Parameters

Parameter Name Type Required Description
targetObject textarea Yes Enter the target JSON object
source1 textarea Yes First source object
source2 textarea No Optional source object
source3 textarea No Optional source object

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-assign-in-object": {
      "name": "assign-in-object",
      "description": "Assign own and inherited properties using lodash _.assignIn",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=assign-in-object",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]