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JSON Flattener

Flatten nested JSON objects into key-value pairs with customizable delimiters and flattening strategies

Key Facts

Category
Data Processing
Input Types
textarea, select, text, number, checkbox
Output Type
json
Sample Coverage
4
API Ready
Yes

Overview

The JSON Flattener is a powerful utility designed to transform complex, deeply nested JSON objects into a simplified, flat structure of key-value pairs, making your data easier to analyze, map, or import into tabular formats.

When to Use

  • •Preparing nested API responses for import into spreadsheet software like Excel or Google Sheets.
  • •Simplifying complex configuration files to make specific settings easier to search and manage.
  • •Standardizing hierarchical data structures for database ingestion or flat-file storage.

How It Works

  • •Paste your nested JSON object into the input area.
  • •Select your preferred flattening strategy, such as dot notation or bracket syntax, and define a custom delimiter if needed.
  • •Adjust optional settings like maximum depth, array inclusion, or key sorting to refine the output.
  • •Generate the flattened result instantly to copy or download for your project.

Use Cases

Converting complex JSON API responses into flat CSV-compatible formats for data analysis.
Flattening application configuration files to quickly identify and update specific nested parameters.
Normalizing hierarchical data for easier integration with legacy systems that only support flat key-value pairs.

Examples

1. Flattening API Response for Spreadsheet Import

Data Analyst
Background
An analyst received a deeply nested JSON response from a REST API containing user profile data.
Problem
The nested structure cannot be directly imported into a flat CSV report.
How to Use
Paste the JSON, select 'Dot Notation' as the strategy, and set the delimiter to a period.
Example Config
strategy: dot, delimiter: ., includeArrays: true
Outcome
A clean, flat list of keys like 'user.profile.id' and 'user.profile.email' ready for spreadsheet import.

2. Simplifying Configuration Files

DevOps Engineer
Background
A large configuration file with multiple levels of nesting makes it difficult to track specific environment variables.
Problem
Need to extract all settings into a single list to compare across different environments.
How to Use
Input the config JSON and use the 'Alphabetical' sort option to organize the keys.
Example Config
strategy: nested, sortKeys: alphabetical
Outcome
An alphabetically sorted, flat list of all configuration settings, making it easy to spot discrepancies between files.

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FAQ

What does the 'Flattening Strategy' option do?

It determines the syntax used to represent nested keys in the final flat output, such as using dots (user.details.name) or slashes (/user/details/name).

Can I limit how deep the tool flattens the JSON?

Yes, you can set the 'Maximum Depth' parameter to stop flattening after a specific number of levels, keeping deeper structures intact.

Does this tool handle arrays within the JSON?

Yes, you can toggle the 'Include Arrays' option to decide whether array elements should be flattened into the key-value structure.

Can I remove empty values from the output?

Yes, enable the 'Filter Out Null/Undefined Values' checkbox to automatically exclude any keys that do not contain data.

Is the original order of keys preserved?

By default, the tool preserves the original order, but you can override this by selecting a sorting option like 'Alphabetical' or 'By Depth'.

API Documentation

Request Endpoint

POST /en/api/tools/json-flattener

Request Parameters

Parameter Name Type Required Description
jsonInput textarea Yes -
strategy select Yes -
delimiter text No -
maxDepth number No -
includeArrays checkbox No -
filterNulls checkbox No -
preserveOrder checkbox No -
sortKeys select Yes -

Response Format

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
JSON Data: JSON Data

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-json-flattener": {
      "name": "json-flattener",
      "description": "Flatten nested JSON objects into key-value pairs with customizable delimiters and flattening strategies",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=json-flattener",
      "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]