Show HN: Datamorph – A clean JSON ⇄ CSV converter with auto-detect

I built a small web tool called Datamorph because I kept running into JSON/CSV converters that either broke with nested data, required login, or added weird formatting.

Datamorph is a minimal, fast, no-login tool that can:

• Convert JSON → CSV and CSV → JSON • Auto-detect structure (arrays, nested objects, mixed data) • Handle uploads or manual text input • Beautify / fix invalid JSON • Give clean, flat CSV output for real-world messy data

It’s built with React + Supabase + serverless functions. Everything runs client-side except file parsing, so nothing is stored.

I know there are many similar tools, but I tried focusing on:

• better handling of nested JSON, • simpler UI, • zero ads / zero login, • instant conversion without waiting.

Would love feedback on edge cases it fails on, or features you think would make this actually useful for devs and analysts.

Live tool: https://datamorphio.vercel.app/

Thanks for checking it out!

Visit

cobertos

Tried it on a 9.9MB json file I have. Seemed to handle the size fine, but the output was nothing like what I would want. I made a smaller version of what I uploaded in the below pastebin and the output.

The data is TLD data so it should have at least given me the "com", "net", "..." part

Input

https://pastebin.com/QAWeu8Xt

Output

    category,addedToListPrice,appliesToCustomers,amountRateType,amountRate,type
    fee_tax,false,eu,percent-varies-by-location,~,vat
    fee_tax,false,in,percent,15,gst
    fee_tax,false,au,percent,10,gst
    fee_tax,false,eu,percent-varies-by-location,~,vat

An explanation of _how_ it does the conversion would be nice when choosing a tool like this. As the "just works" didn't seem to work.