JSON Unflatten Guide

What this guide covers

Use this JSON Unflatten tool to convert flat path-based JSON into a nested JSON structure again. It is useful when you receive flattened exports, mapping results, analytics-style path objects, or intermediate transformed data and want to rebuild the original nested shape. The tool supports dot notation for objects and bracket indexes for arrays.

This guide explains when to use JSON Unflatten, how to get a cleaner result, and which mistakes to avoid before moving on to related tools or the main tool page.

Why use JSON Unflatten

• Rebuild nested JSON from flat path-based objects
• Turn mapping-style key paths back into structured data
• Restore object hierarchy after flattening or exporting
• Work with dot notation and array index notation in one step
• Inspect flat transformation results in a readable nested form

How to use JSON Unflatten

1. Paste a flat JSON object into the input box
2. Use keys like user.id or orders[0].id in the input
3. Click Run Tool to rebuild the nested structure
4. Review the nested JSON output
5. Copy the result for reuse, testing, or documentation

Best use cases

• Restoring nested JSON after flattening for exports
• Rebuilding payloads from path-value mapping results
• Turning analytics-style flat keys into structured objects
• Preparing nested fixtures from flat test data
• Inspecting flat configuration paths in a normal JSON shape

Common mistakes