Customer JSON to CSV
Input
[{"name":"Tanaka","address":{"city":"Tokyo"}},{"name":"Sato","address":{"city":"Osaka"}}]Output
name,address.city Tanaka,Tokyo Sato,Osaka
JSON / CSV Converter
Paste JSON or CSV and get the other format instantly, with nested JSON flattened into spreadsheet-ready columns.
Conversion tools
What it helps with
- Turn exported JSON data into a spreadsheet for Excel
- Convert a spreadsheet CSV into JSON for a config or API
- Flatten nested JSON into readable columns
How to use
- Choose the direction: JSON to CSV, or CSV to JSON.
- Paste the data and check the live result.
- Copy the output, or download the CSV in Excel-safe UTF-8 (BOM).
Examples
CSV to JSON
Input
name,age Tanaka,30 Sato,25
Output
[{"name":"Tanaka","age":30},{"name":"Sato","age":25}]Good to know
- JSON input must be an array of objects, a single object, or an array of values.
- Very deeply nested or very wide data can produce many columns.
- Type inference converts plain numbers and true/false; values with leading zeros stay as text.
FAQ
- How is nested JSON handled?
- Nested objects and arrays become dot-separated columns such as user.address.city or items.0. Converting back can rebuild them into nested JSON.
- Why does the CSV download open correctly in Excel?
- The download is UTF-8 with a BOM, which Japanese Excel reads without mojibake. Plain UTF-8 CSV files often garble in Excel.
- Is pasted data stored?
- No. KoguNavi has no feature to store pasted data. Copy what you need.
Related tools
Nearby utilities from the KoguNavi toolbox.