Productive ToolboxCSV to JSON Converter
Parse CSV text or files into structured JSON. Preview table, download JSON, copy to clipboard.
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CSV to JSON Converter – Instant Data Transformation
Convert CSV (Comma-Separated Values) data into structured JSON format instantly with our free converter. Perfect for developers, data engineers, and analysts who need to transform spreadsheet data for APIs, databases, or JavaScript applications.
How It Works
- Add your CSV: Paste CSV text into the input box or upload a .csv or .txt file, such as an export from Excel, Google Sheets or a database.
- Set the delimiter: Choose comma, semicolon, tab or pipe, or turn on auto-detect. Files saved by Excel in much of Europe use semicolons.
- Choose the options: Use the first row as JSON keys, trim spaces around values, handle quoted fields, and pick pretty-printed or minified JSON.
- Check the preview: The table preview shows how rows and columns were read, with the row and column count.
- Copy or download: Copy the JSON to the clipboard or download it as a .json file.
Features
- Multiple delimiter support (comma, semicolon, tab, pipe)
- Auto-detect delimiter from CSV data
- Handle quoted values with proper escaping
- Trim whitespace from values
- Use first row as JSON keys
- Real-time table preview
- Pretty or minified JSON output
- Copy to clipboard or download as file
- Private: your inputs are not collected or stored
Example
Input CSV:
name,age,city John,30,New York Alice,25,Los Angeles
Output JSON:
[
{
"name": "John",
"age": "30",
"city": "New York"
},
{
"name": "Alice",
"age": "25",
"city": "Los Angeles"
}
]Use Cases
- Convert spreadsheet exports to JSON for APIs
- Transform database CSV dumps for NoSQL databases
- Prepare data for JavaScript applications
- Integrate CSV data with REST APIs
- Data migration and transformation
- Testing and development workflows
Privacy & Performance
We do not collect or store what you enter. The converter handles large CSV files efficiently with real-time parsing and preview rendering.
Frequently Asked Questions
How does CSV map to JSON?
With Use first row as headers on, each following row becomes one JSON object whose keys are the header names, and the whole file becomes an array of those objects. With it off, the keys are column_1, column_2 and so on.
Are numbers and true/false converted?
No. Every value is kept as a JSON string, for example "30" rather than 30, because CSV has no data types and values such as ZIP codes ("02115") or IDs with leading zeros would be damaged by automatic conversion. Convert the fields you need in your own code.
How are commas, quotes and line breaks inside a value handled?
As in the CSV standard (RFC 4180): a value wrapped in double quotes may contain the delimiter and line breaks, and a doubled quote ("") inside it becomes one quote. For example "Los Angeles, CA" stays one value.
Why is my file split into the wrong columns?
The delimiter is probably different. Excel uses a semicolon in countries where the comma is the decimal separator, such as Germany, France and Spain; choose Semicolon or turn on auto-detect. Tab-separated files need Tab.
What happens with blank or repeated column names?
A blank header becomes column_1, column_2 and so on by position, and a repeated header gets a suffix such as email_2, so no column is dropped from the JSON. Empty lines in the file are skipped.
Is my data uploaded?
No. We do not collect or store what you enter.
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