Convert Between CSV and JSON Formats with Auto-Detection
A powerful tool for converting data between CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) formats. Features automatic format detection, file upload and download, and intelligent data type parsing.
The CSV-JSON Converter tool provides bidirectional conversion between CSV and JSON formats. It automatically detects the input format and converts it to the appropriate output format.
The tool supports two conversion directions that can be switched manually or determined automatically based on the input format.
Converts CSV (Comma-Separated Values) data into a JSON array of objects. Each row becomes an object with properties based on column headers.
Converts a JSON array of objects into CSV format. Each object becomes a row, with properties as columns.
Tip: You can manually switch between modes using the "Switch Mode" button. When switched, the output becomes the input for the reverse conversion.
The tool automatically detects whether your input is CSV or JSON format and performs the appropriate conversion. This feature can be toggled or disabled by using manual mode.
Input starting with [ or { is parsed as JSON. If parsing succeeds, it is treated as JSON format.
Input with consistent comma counts across lines is treated as CSV. The first line must have the same number of commas as subsequent lines.
If the format cannot be determined, an error is shown and you can manually select the conversion mode.
Note: Auto-detection runs with a 500ms debounce after you stop typing. The detected format is displayed with a badge in the header.
Several options allow you to customize the conversion behavior to suit your needs.
When enabled, the first row of CSV data is used as property names for JSON objects, or included as the header row in CSV output.
Default: Enabled
Formats JSON output with proper indentation (2 spaces) for better readability. When disabled, JSON is minified to a single line.
Default: Enabled
When enabled, conversion happens automatically as you type. When disabled, you must click the Convert button manually.
Default: Disabled (auto-convert on input)
The tool supports uploading CSV and JSON files directly, as well as downloading the converted output.
Click the Upload button or drag and drop files to load CSV or JSON data. Supported file extensions are .csv and .json.
Click the Download button to save the converted output as a file. The file extension is automatically set based on the output format.
name,age,city,active John,30,New York,true Jane,25,Los Angeles,false Bob,35,Chicago,true
[
{ "name": "John", "age": 30, "city": "New York", "active": true },
{ "name": "Jane", "age": 25, "city": "Los Angeles", "active": false },
{ "name": "Bob", "age": 35, "city": "Chicago", "active": true }
][
{ "name": "Alice", "score": 95, "passed": true },
{ "name": "Bob", "score": 82, "passed": true },
{ "name": "Charlie", "score": 68, "passed": false }
]name,score,passed Alice,95,true Bob,82,true Charlie,68,false
Note: The tool automatically detects data types. Numeric strings become numbers, true/false become booleans, and empty values become null.
Once conversion is complete, several options are available for working with the output.
Displays the number of rows, columns, and file size of the converted data. Updated in real-time as you modify input.
Visual indicator showing whether the conversion was successful or if there were any errors during processing.
Load sample CSV or JSON data to test the converter. Sample data is appropriate for the current conversion mode.
Speed up your workflow with these keyboard shortcuts:
| Action | Shortcut |
|---|---|
| Convert | Ctrl / Cmd + Enter |
| Copy Output | Ctrl / Cmd + C |
| Clear All | Ctrl / Cmd + L |
| Switch Mode | Ctrl / Cmd + M |
| Upload File | Ctrl / Cmd + U |
| Download Output | Ctrl / Cmd + D |
Convert CSV exports from spreadsheets or databases to JSON for use in web applications, APIs, or NoSQL databases.
Transform data between formats required by different APIs. Many REST APIs accept JSON while legacy systems may require CSV.
Import CSV data into JSON-based analysis tools, or export JSON results to CSV for spreadsheet editing.
Convert CSV-based configuration or lookup tables to JSON for use in modern application configurations.
Share data in the format that best suits the recipient. CSV for business users, JSON for developers.
Quickly generate test data by converting between formats, or prepare sample data for development environments.