CSV to JSON Converter
Turn spreadsheet rows into a clean JSON array, entirely in your browser, with no upload.
No Data Collection
No database, no accounts. We literally can't see your images.
Blazing Fast
Native browser processing — no upload, no waiting.
100% Free
No limits, no watermarks, no hidden fees. Ever.
No Account Required
Sign in? Never. Just open the tool and use it.
Convert CSV to JSON
From rows and columns to objects
CSV is the lowest common denominator for tabular data: every spreadsheet and database can export it, but almost nothing consumes it directly in code. JSON is the opposite, awkward to edit by hand yet native to every programming language and API. Converting between them is one of the most common glue tasks in day-to-day data work.
This converter reads each line of your CSV, uses the first row as the set of keys, and emits one JSON object per remaining row. The result is an array you can drop straight into a fetch mock, a config file, or a database seed script.
Headers, delimiters, and quoted fields
Not every file is comma-separated. Exports from European locales often use semicolons, and database dumps frequently use tabs, so you can switch the delimiter to match your source. If your file has no header row, turn that option off and each line becomes a plain array instead of an object.
Real CSV is messier than it looks. A field wrapped in double quotes may itself contain commas, line breaks, or escaped quotes written as two double quotes in a row. The parser follows RFC 4180, so a value like "Doe, John" stays a single field instead of splitting into two columns.
Type coercion and why leading zeros stay strings
CSV has no concept of types, so every cell arrives as text. To make the JSON immediately useful, numbers and the literals true, false, and null are converted to their real JSON types. You can switch this off if you would rather keep everything as strings.
One deliberate exception: values with a leading zero, such as 007 or a ZIP code like 02134, are kept as strings. Coercing them to numbers would silently drop the zero and corrupt identifiers, which is rarely what you want.
Processed locally, never uploaded
The conversion runs in your browser with JavaScript. Your data is never sent to a server, which means spreadsheets full of customer records, financials, or anything else confidential stay on your machine.
Because there is no upload or download round trip, conversion is instant even for large files, and it keeps working offline once the page has loaded.
Frequently asked questions
Does my CSV get uploaded anywhere?
No. The file is parsed entirely in your browser and never leaves your device, so it is safe for confidential or personal data.
How are numbers and booleans handled?
By default, cells that look like numbers or the words true, false, and null become real JSON types. Leading-zero values like 007 stay strings so identifiers are not corrupted, and you can disable coercion entirely to keep everything as text.
Can I use tabs or semicolons instead of commas?
Yes. Choose comma, semicolon, tab, or pipe as the delimiter to match how your file was exported.
What happens to commas or line breaks inside a field?
Fields wrapped in double quotes are parsed per RFC 4180, so embedded commas, line breaks, and escaped quotes are preserved instead of breaking the row apart.