I Built a CSV to JSON Converter in 30 Lines of Python - It Replaced My $50 SaaS

I Built a CSV to JSON Converter in 30 Lines of Python - It Replaced My $50 SaaS Every data analyst, engineer, and researcher faces the same problem: You have data in CSV. You need it in JSON. So you: Open an online converter (Cloudinary, Zamzar, CloudConvert) Upload file (privacy concern: uploading data to stranger's server) Wait for processing (slow) Download JSON Repeat 20 times a month And if you need to convert more than 100 rows? You hit the free tier limit and need to pay $50-100/month for a subscription. Last month I did the math: I was converting CSVs 50+ times monthly. $50/month SaaS = $600/year for what should take 30 seconds. So I built CSV to JSON Converter CLI in Python. 30 lines. Zero dependencies. Free. Since then, I've never paid another subscription. The Problem: CSV to JSON Is Simple (But Expensive) CSV to JSON conversion is trivial programmatically. But online tools charge for it because: They host servers — Costs money, pass cost to users Rate limiting — They thrott