Strings are the safe default
Leading zeros, account numbers, postal codes, date-like values, and long IDs remain quoted unless you deliberately enable inference.
Online data converter
Paste CSV and download valid JSON
LiveParse reads the first row as property names, handles standard CSV quoting, and produces a JSON object for each data row—all without a server upload.
Loading the CSV to JSON converter…
Enable JavaScript to convert, copy, and download JSON.
Three quick steps
How to convert CSV to JSON online
Use pasted spreadsheet data, a downloaded report, or a local .csv file. The converter understands quoted fields rather than simply splitting each line at commas.
- 1
Paste or open CSV
Include a header row followed by the records. Commas, quotes, and physical line breaks inside quoted cells are read as part of the value.
- 2
Choose delimiter and types
Select comma, semicolon, tab, or pipe input. Keep every value as a string, or infer JSON numbers, booleans, and
null. - 3
Copy or download JSON
Convert to a readable JSON array, review the row and column totals, then copy the output or save a
.jsonfile.
Clear mapping rules
How CSV rows map to JSON objects
CSV does not define data types or object property names by itself. LiveParse treats the first non-empty row as headers and converts every later row into one JSON object. A header such as customer_id becomes a JSON property with the same name.
Blank headers are replaced with names such as column_3. Repeated headers remain separate by receiving a suffix, for example status and status_2. Short rows get empty-string values for missing cells, so every object has the same predictable set of properties.
String mode is the safe default because CSV cannot tell whether 00123 is a number, postal code, or identifier. Enable type inference only when values such as true, null, and numeric tokens should become JSON literals instead of quoted strings.
- Header row
- Becomes the property names on every JSON object.
- Data row
- Becomes one object in the output JSON array.
- Empty cell
- Becomes an empty string instead of disappearing.
- Quoted cell
- Can contain delimiters, doubled quotes, and line breaks.
Explicit type control
Prevent accidental data changes during conversion
Inferred number tokens stay exact
When inference is enabled, a valid JSON number token is written directly to the output instead of being rounded through a JavaScript number first.
Malformed CSV gets a location
An unclosed quote or an unexpected character after a quoted field returns a line and column so you can repair the source record.
Everything runs locally
The browser reads the selected file and creates the JSON in memory. LiveParse does not transmit or retain the CSV contents.
Common workflows
When to convert CSV to JSON
Prepare API request data
Turn a spreadsheet-managed list into a JSON array before posting records to a REST endpoint or loading a development fixture.
Move a report into JavaScript
Convert an analytics, CRM, ecommerce, or finance export into objects that frontend and Node.js code can read directly.
Create test fixtures
Transform rows maintained by non-developers into readable JSON for unit tests, demos, seed data, and local prototypes.
Inspect tricky CSV quoting
Verify how embedded commas, escaped double quotes, and multiline notes are interpreted before importing them into another system.
Questions answered
CSV to JSON FAQ
Is this CSV to JSON converter free?
Yes. It is free to use without an account, upload limit, or paid tier.
Does it support commas inside a CSV value?
Yes. A comma inside a double-quoted field stays in that field. Two consecutive quotes inside a quoted field become one literal quote.
Can a CSV field contain a line break?
Yes. Physical line breaks inside a properly quoted field are preserved as newline characters in the JSON string.
Why are numbers quoted in the default JSON output?
CSV has no reliable type information. Keeping values as strings prevents leading zeros, IDs, postal codes, and long numbers from changing. Enable type inference when numeric JSON values are required.
Can I convert tab-separated or semicolon-separated data?
Yes. Choose tab, semicolon, or pipe in the delimiter setting before converting.
How do I turn the JSON back into CSV?
Use the JSON to CSV converter to flatten nested objects, collect headers across records, and download spreadsheet-safe CSV.