CSV to JSON Converter
Paste CSV or drop a file to get clean JSON instantly. Comma, semicolon, tab and pipe delimiters are detected automatically, and nothing leaves your browser.
Converted on your device. Your data never leaves your browser.
How to convert CSV to JSON
- 1
Paste your CSV into the input box, drop a .csv file onto it, or press Open file.
- 2
Check the options: the delimiter is auto-detected, the first row becomes the JSON keys, and numbers and booleans are typed.
- 3
Copy the JSON or press Download .json to save it.
Why use this CSV to JSON converter
Handles real-world CSV
Quoted fields, escaped quotes, commas and line breaks inside cells, and Excel's byte-order mark are all parsed correctly.
Smart types
Numbers, true/false and empty cells become proper JSON values, while IDs and ZIP codes with leading zeros stay as text.
Any delimiter
Comma, semicolon (common in European Excel exports), tab and pipe are detected automatically.
Private and instant
Everything is converted in your browser as you type. Your data is never uploaded.
Popular uses for the CSV to JSON converter
Import spreadsheets into apps
Get rows from Excel or Google Sheets into JSON for code and APIs.
Create JSON fixtures
Build test data for front-end and back-end development.
Feed charts and dashboards
Many charting libraries expect JSON arrays.
Clean up exports
Convert CSV exports from CRMs and stores into structured JSON.
Also known as: CSV to JSON converter, spreadsheet to JSON, Excel to JSON and CSV parser online.
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A fast browser file utility for data
Convert CSV, JSON and YAML, or encode images as Base64, with a free online file converter that needs no install. It's a client-side file converter, so private data, exports and API keys stay on your device instead of being sent to a server.
Frequently asked questions
How do I convert an Excel spreadsheet to JSON?
In Excel or Google Sheets, use File → Save As (or Download) → CSV, then drop the CSV file into the converter above and download the JSON.
What does "First row is header" do?
When it's on, the first row supplies the keys and every other row becomes a JSON object, like {"name": "Ada"}. Turn it off to get an array of arrays instead.
Why do some numbers stay as text?
Values with leading zeros, such as ZIP codes or IDs like 007, and integers too large for JSON numbers are kept as strings so no information is lost. Turn off "Detect numbers & booleans" to keep every value as text.
Can it handle large CSV files?
Yes. Files with hundreds of thousands of rows convert in a second or two. For very large files the on-screen preview is shortened, but the download always contains the full JSON.
Are my files uploaded to a server?
No. Conversion runs entirely in your browser via client-side JavaScript, on your own device. Your files never touch a remote server and nothing is stored, so it's a secure, private, no-upload tool for personal photos and confidential data, and it keeps working on slow connections.
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Step-by-step guides
- How to Convert CSV to JSON online
- How to Convert CSV to JSON on Mac
- How to Convert CSV to JSON on Windows
- How to Convert CSV to JSON on Chromebook