How to convert CSV to JSON and JSON to CSV
CSV represents data in rows and columns using separators; JSON uses objects and arrays. Converting between both formats is useful for moving information between spreadsheets, scripts, and APIs, but requires reviewing how fields are represented.
Preparing a valid CSV
Verify that the first row contains headers, that the delimiter is consistent, and that fields with commas or line breaks are correctly quoted.
Check leading zeros, dates, and long numbers. Some applications interpret these values differently when opening them.
Reviewing the output JSON
In JSON, each row is usually converted into an object with properties associated with the headers. If column names are repeated or empty, the structure may not represent what you expect.
After converting, compare several records with the original CSV and validate that no characters, columns, or values have been lost.
Common questions
Does CSV support nested lists or objects?
CSV is tabular and does not natively represent nested structures. JSON can express arrays and objects within other objects.
Does the conversion preserve leading zeros?
It depends on how values are interpreted. Check identifiers, zip codes, and account numbers as text when applicable.