JSON Unflatten

Restore nested JSON from flat dot-notation keys. Paste a flat JSON object and click Run to rebuild the hierarchy.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about unflattening JSON

How to Unflatten JSON Keys

JSON Unflattening

When to Unflatten JSON

Restore hierarchical JSON from flat dot-notation keys produced by flattening tools, spreadsheets, or log pipelines.

Frequently asked questions

What input shape is expected?

A single JSON object with flat string keys using dot and bracket notation.