JSON Flatten / JSON to CSV

Flatten nested JSON into dot-notation fields and convert to CSV.

What this tool does

Flatten nested JSON objects into dot-notation keys and export the result as flattened JSON or CSV for tabular workflows.

Tool interface

JSON Input

Array values are preserved as JSON strings by default so nested arrays are not dropped during conversion.

Output

Quick Actions

Flattened Preview

Run the tool to preview flattened rows.

Example input

{"user":{"name":"Ana","address":{"city":"Melbourne"}},"roles":["admin","editor"]}

Example output

{
  "user.name": "Ana",
  "user.address.city": "Melbourne",
  "roles": "[\"admin\",\"editor\"]"
}

Step-by-step instructions

  1. Paste nested JSON or upload a JSON file.
  2. Choose output mode: flattened JSON or CSV.
  3. Transform data, preview rows, then copy/download the output.

Common use cases

  • Converting json flatten data into csv format for downstream tools.
  • Preparing transformed data for imports, reporting, or API workflows.
  • Reducing manual reformatting work between systems with incompatible formats.

Makes nested API payloads easier to analyze in spreadsheets and BI tools by producing tabular-friendly columns.

Common mistakes to avoid

  • Using input that does not match the source format expected by the converter.
  • Assuming nested or irregular records will map cleanly without review.
  • Skipping output validation before importing into another system.

Frequently Asked Questions

How are arrays handled when flattening JSON?

Arrays are preserved as JSON strings in a single flattened field by default.

Can I export both flattened JSON and CSV?

Yes. The tool provides copy and download actions for both outputs.

What input format does JSON Flatten / JSON to CSV expect?

Use valid JSON input unless the tool explicitly asks for path or pattern syntax first.

What does JSON Flatten / JSON to CSV output?

It returns transformed output you can copy or download as `flattened.csv`.

Why might JSON Flatten / JSON to CSV return an error?

Most failures come from malformed input that does not match the expected format.

Does JSON Flatten / JSON to CSV run in the browser?

Yes. Transformations are designed for in-browser usage so you can test and iterate quickly.

Can I copy or download results from JSON Flatten / JSON to CSV?

Yes. You can copy the result or use the download action when file output is available.

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Related categories

Looking for other utilities in this area? JSON Tools, Developer Data Tools