CSV to JSON Converter
Paste or upload a CSV file and convert it to a clean JSON array — free, instant, browser-based.
CSV Input
How to convert CSV to JSON
- Paste your CSV data into the input box, or upload a .csv file.
- The first row is treated as the header and becomes JSON keys.
- Click Convert to JSON to process the data.
- Copy the result or click Download to save as a .json file.
When to convert CSV to JSON
CSV is the universal data exchange format used by spreadsheets, databases, and data pipelines. Converting CSV to JSON makes data ready for use in JavaScript applications, REST APIs, or NoSQL databases. A clean JSON array is also much easier to inspect and manipulate in code.
How CSV rows become JSON objects
The first row of your CSV is read as the header row, and each remaining row becomes one object in a JSON array — every header becomes a key paired with the matching cell value. The output is an array of objects, ready to drop into a JavaScript app, a REST API request, or a NoSQL import, and you can pretty-print it further with the JSON Formatter. Values are kept as strings exactly as they appear in the CSV, so numbers and true/false text are not automatically converted to JSON numbers or booleans.
How the CSV is parsed
The parser follows RFC 4180-style rules: fields wrapped in double quotes can safely contain commas, line breaks, and escaped double quotes (""). Empty cells become empty strings, and both Windows (CRLF) and Unix (LF) line endings are handled. If two columns share the same header name, the later column's value wins for that key, because JSON keys must be unique. Input is parsed as comma-separated values — semicolon- or tab-separated data is not auto-detected, so convert it to commas first. Need a spreadsheet instead? Try CSV to XLSX.
Privacy — your data stays local
This tool runs entirely in your browser using JavaScript. Your CSV or JSON data is never sent to any server. Everything is processed locally on your device, making it safe for sensitive records, financial exports, or personal data — though you should always follow your organisation's data policies before using any online tool with confidential files.
Frequently Asked Questions
Does the CSV need a header row?
Yes. The first row of your CSV is used as the JSON keys. If your CSV has no headers, add a header row before converting.
Does the output become an array of objects?
Yes. Each data row becomes one object, and all the objects are returned together as a single JSON array.
Does it convert numbers and booleans automatically?
No. Values are kept as strings exactly as they appear in the CSV, so 30 becomes "30" and true becomes "true". Cast them to numbers or booleans in your own code if you need typed values.
What happens to empty cells and duplicate column names?
Empty cells become empty strings (""). If two columns share the same header, the later column's value wins for that key, because JSON keys must be unique.
Can I use semicolon or tab delimiters?
Input is parsed as comma-separated values. Semicolon- or tab-separated data is not auto-detected, so convert it to commas before pasting.
Does it handle quoted fields with commas inside?
Yes. The parser follows RFC 4180-style quoting, so quoted fields that contain commas, line breaks, or escaped double-quotes are read correctly.
Can I copy or download the result?
Yes — copy the output to your clipboard, or download it as a file with one click.
Is this tool completely free?
Yes — free with no account and no subscription. There is no fixed row cap; the practical limit is your browser's available memory, so very large files may process more slowly.
Will my data be uploaded anywhere?
No. All processing happens locally in your browser. Nothing is sent to a server.