Question 1

What input shape does this flattener accept?

Accepted Answer

It accepts a single JSON object or an array of JSON objects. Top-level primitives and mixed arrays are rejected with a friendly validation error.

Question 2

How are nested arrays handled?

Accepted Answer

You can either expand arrays into indexed paths like items.0.sku and tags.1, or preserve each array as one JSON string field if that better fits your export workflow.

Question 3

Does flattening change the values?

Accepted Answer

No. The structure changes, but the underlying values stay the same. Nested paths are turned into flat keys so the data is easier to inspect, export, and compare.

Question 4

Can I change the key separator?

Accepted Answer

Yes. Use dot, underscore, or slash separators depending on the naming style your spreadsheet, script, or warehouse expects.

Question 5

Is my JSON uploaded anywhere?

Accepted Answer

No. Everything runs locally in your browser using JavaScript. Your payload never leaves your device.

Question 6

What is the flattened key count?

Accepted Answer

The tool reports the number of unique flattened keys discovered across the output records, which is a quick way to understand how wide the flattened schema becomes.