I'm a Data Engineer and in my day-to-day, I constantly need to format huge SQL queries, convert nested JSONs to CSV, or test Regex. I always hesitated to paste sensitive company data into random online converters because of privacy and compliance concerns.
To solve my own itch, I built DataSwift. It’s a suite of 8 developer tools that run 100% locally in your browser. No data is ever sent to an external server.
The current tools include: - JSON to CSV (flattens nested objects automatically) - JSON to Code (generates Pydantic, Java, or TS models) - CSV to SQL (infers data types for CREATE/INSERT statements) - SQL Formatter - Regex Tester - Fake Data Generator - Base64 Encoder/Decoder
It's completely free and requires no login. I built the frontend using Next.js, Tailwind, and Shadcn UI.
I would love to hear your feedback, bugs you might find, or if there are any specific local-first tools you'd like me to add next!