How I Built a JSON to CSV Converter That Actually Handles Nested Objects

Hey everyone! 👋

If you work in IT and constantly deal with APIs or data analytics, you've probably had to convert a complex JSON file into a CSV.

Most JSON-to-CSV converters choke on nested data. You drop in an API response with embedded objects and arrays, and you get either a broken CSV or [object Object] in every cell. 🤦‍♂️

I got tired of this and built JSONCSV.tools — a zero-backend converter that flattens deeply nested JSON into clean, spreadsheet-ready CSV. Here's how it works under the hood.

Say you have this API response:

How I Built a JSON to CSV Converter That Actually Handles Nested Objects

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