Online JSON Flatten Tool

Transform deeply nested JSON objects into flat, single-level dot-separated properties for spreadsheets and databases.

100% Client-Side Processing — your JSON never leaves this browser. Works offline. How it works

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About this tool

How the JSON Flatten works

Flatten deeply nested JSON objects into single-level key-value pairs with dot notation (user.address.city). Ideal for SQL and tabular exports.

Dot Notation Flattening

Converts nested paths like { "user": { "name": "Alex" } } into "user.name": "Alex".

Array Index Notation

Preserves array positions using dot-index keys (e.g. "items.0.id": 101).

Database & SQL Friendly

Simplifies loading complex documents into relational database tables and analytical tools.

One-Click Unflattening

Easily reverse the flattening operation using our companion JSON Unflatten tool.

FAQ

Common questions

What does flattening JSON do?

Flattening collapses multi-level nested objects into a single-depth dictionary where keys represent the full path separated by dots.

How are arrays handled when flattening?

Arrays are flattened with their numeric indices (e.g., tags.0, tags.1).

Can I unflatten the output later?

Yes! SnipFerry includes a companion JSON Unflatten tool that reconstructs the original nested hierarchy.

Is flattening processed securely?

Yes, 100% client-side in your browser memory.

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