CSV File to JSON Converter
Drop a CSV file and get back a JSON array of objects, with the header row used as keys. Pretty-print or minify.
Quick answer: Drop a CSV file and get back a JSON array of objects, with the header row used as keys. Pretty-print or minify.
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Frequently asked questions
- How are CSV columns mapped to JSON keys?
- The first row of the CSV is used as the JSON object keys. Every subsequent row becomes one object in a top-level JSON array. Empty cells become empty strings (`""`).
- Are values typed as numbers or kept as strings?
- All values are kept as strings — we don't guess types, because `"007"` is a valid string in many datasets and silently coercing it to `7` loses data. Cast types in your downstream code with confidence about which fields are which.
- Does it handle quoted fields with commas?
- Yes. The Papaparse parser is RFC-4180 compliant: embedded commas, newlines and `""` escaped quotes round-trip into the JSON values exactly.
- What if my CSV has duplicate column names?
- Later columns overwrite earlier ones in each object (since JSON object keys are unique). Rename duplicate headers in the source CSV — or use the Column Mapper tool — before converting.
- Is there a row limit?
- No fixed limit. Files with hundreds of thousands of rows convert in seconds; the practical cap is the memory available to your browser tab.
- Pretty-printed vs minified — which should I use?
- Pretty-print is easier to read and diff in version control. Minified is roughly 30–50% smaller and is the right choice for shipping the JSON to an API or front-end. Both are functionally identical.
- Can I convert without the header row?
- Not yet — every output object is keyed by the first row. If your CSV has no header, prepend one (`col1,col2,col3`) before converting.
- Will my data be uploaded?
- No. CSV → JSON conversion runs entirely in your browser; nothing is sent to our server.
- Can I copy the result instead of downloading?
- Yes. The Copy button next to the output writes the JSON to your clipboard.
- Does the output include a BOM or other prefix?
- No. The download is plain UTF-8 JSON, ready for any consumer.