Drop your CSV file into fwip’s converter and download valid JSON. Or drop JSON in and get a CSV. Headers become keys. Rows become objects. Everything processes on your device — your data never touches a server.
How to do it
- Open fwip’s CSV to JSON converter.
- Drop your CSV file in (or paste the content).
- Hit Convert.
- Download your JSON file, or copy the output.
Works the other direction too — JSON to CSV.
Why this matters
Developers switch between CSV and JSON constantly. APIs want JSON. Spreadsheets want CSV. Database exports come in one, and the tool you’re feeding needs the other. It’s a 30-second task that shouldn’t require writing a script or uploading your dataset to a random website.
If your CSV contains customer data, financial records, or anything sensitive, uploading it to an online converter is a bad idea. fwip processes it locally — your data stays on your machine.
Frequently asked questions
How does fwip handle CSV headers? The first row is treated as headers. Each subsequent row becomes a JSON object with the headers as keys. If there are no headers, keys are generated as “field1”, “field2”, etc.
Can I convert JSON to CSV? Yes. Same tool, other direction. Drop a JSON array of objects in and get a flat CSV with headers derived from the keys.
Does it handle nested JSON? For CSV to JSON, the output is flat (one level). For complex nested structures, you may need to reshape the data after conversion.
What about special characters and encoding? fwip handles UTF-8 encoding. Special characters, accents, and non-Latin scripts are preserved.
Is there a file size limit? Browser handles files up to several hundred MB. Desktop app has no practical limit.