Convert CSV to JSON
To convert CSV to JSON, drop your CSV into the converter on this page and press Convert to JSON. Each row becomes an object keyed by the header, assembled in your browser so the data stays on your machine.
Runs in your browser. Your file never leaves your device.Drop your CSV hereChoose a CSV to convert
It becomes a JSON right in your browser, up to 100 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 100 MB |
Why convert CSV to JSON?
Developers live in JSON. Web APIs speak it, JavaScript parses it natively, and seed data is far easier to read as nested objects than as a wall of commas. A spreadsheet export is the classic starting point that has to become an array of records before code can use it. Converting saves the boilerplate of writing a one-off parser, and doing it in the browser means even a sensitive dataset never touches a third-party service.
What is CSV?
CSV is the plainest way to store a table: one row per line, fields separated by commas, readable by every spreadsheet and database tool. It carries no formatting, formulas, or multiple sheets, which is exactly why it travels so well between programs. The tradeoff is that anything richer than a flat grid has to be flattened to fit.
What is JSON?
JSON is the lingua franca of APIs and config: nested objects and arrays in a compact, human-readable text form that almost every language can parse. It handles structured and hierarchical data that a flat table cannot. For tabular data it is often paired with CSV, and for configuration with YAML.
Quality and what to expect
The first row is treated as the header, and each following row becomes one object whose keys are those headers. Values come through as the text and numbers present in the cells; the converter does not invent types, so a column of postal codes keeps its leading zeros as text. The output is indented for readability. A source with duplicate header names will collide on the repeated key, so unique headers give the cleanest result.
CSV to JSON FAQ
What shape is the JSON?
An array of objects, one per data row, with the header cells as property names. It is the shape most web APIs and import tools expect.
Is my data sent anywhere?
No. The table is parsed and serialized to JSON by code running in your browser tab, with no network request carrying the contents.
What if my CSV has no header row?
The first line is always treated as the header, so a file without one uses its first data row as the keys. Add a header row first if every record should keep all its values.