What is JSON flattening?

JSON flattening is the process of converting nested JSON objects into a single-level structure where complex hierarchies are represented using dot-notation or similar path-based keys. For example, {"user": {"name": "John"}} becomes {"user.name": "John"}. This transformation makes it easier to work with deeply nested data in databases, spreadsheets, or systems that don't handle complex hierarchies well. Unflattening reverses this process, rebuilding the original nested structure from the flat key-value pairs.

Tool Description

This tool converts JSON data between nested and flat formats using the popular flat library. It can flatten deeply nested JSON objects into simple key-value pairs with dot-notation keys, or unflatten flat structures back into their original nested form. The tool preserves data integrity and handles complex nested structures, arrays, and various data types.

Features

  • Bidirectional conversion: Flatten nested JSON or unflatten flat JSON
  • Automatic parsing: Intelligently handles nested objects and arrays
  • Dot notation: Uses standard dot notation for key paths (e.g., user.address.city)
  • Pretty formatting: Outputs formatted, readable JSON with proper indentation
  • Error handling: Clear error messages when input JSON is malformed
  • Live conversion: See results instantly as you type
  • Syntax highlighting: JSON syntax highlighting for better readability

Use Cases

  • Database Operations: Flatten JSON for storage in relational databases
  • CSV Export: Convert nested JSON to flat structure for spreadsheet export
  • Configuration Management: Simplify complex configuration objects
  • Data Analysis: Make nested data easier to query and analyze
  • API Integration: Transform data between flat and nested formats for different APIs
  • Form Data Processing: Convert flat form submissions back to nested objects
  • Data Migration: Prepare nested data for systems that only support flat structures