CSV to JSON Converter
Convert CSV data to JSON format instantly. Auto-detects delimiters, parses types, and supports file upload.
How to Use CSV to JSON Converter
- Paste your CSV data into the input area or upload a .csv file using the Upload button.
- The tool automatically detects the delimiter and converts CSV to JSON in real-time.
- Adjust options: toggle first row as headers, enable auto-detect types (numbers, booleans), or choose output format.
- Copy the JSON output to your clipboard or download it as a .json file.
- Use the Swap button to switch to JSON to CSV conversion mode.
About CSV to JSON Converter
CSV to JSON Converter is a free online tool that transforms CSV (Comma Separated Values) data into structured JSON format. It features automatic delimiter detection (comma, semicolon, tab, pipe), intelligent type parsing that converts numeric strings to numbers and boolean strings to true/false, and proper handling of quoted fields with escaped characters. Output as an array of objects (with column headers as keys) or an array of arrays. The tool correctly handles edge cases like newlines within quoted fields, escaped quotes, inconsistent column counts, and empty values. Perfect for importing spreadsheet data into web applications, preparing data for APIs, or converting tabular data for JavaScript processing. All conversion happens in your browser — your CSV data stays private.
Frequently Asked Questions
How do I convert CSV to JSON?
Paste your CSV data into the input field or upload a .csv file. The tool automatically detects the delimiter and converts each row into a JSON object using the first row as property keys. The result is a JSON array of objects that you can copy or download.
Does the tool auto-detect the CSV delimiter?
Yes. The auto-detect feature analyzes the first line of your CSV to determine whether it uses commas, semicolons, tabs, or pipes as delimiters. You can also disable auto-detection and manually select a delimiter if needed.
What does auto-detect types do?
When enabled, the tool converts string values to their appropriate JSON types: numeric strings like "30" become the number 30, "true"/"false" become booleans, and "null" becomes null. Disable this option if you want all values to remain as strings.
Can I convert CSV without headers?
Yes. Uncheck 'First row as headers' and the tool will generate automatic column names (column_1, column_2, etc.) instead of using the first row as property keys. All rows including the first will be treated as data.
Is my CSV data safe with this tool?
Yes. This CSV to JSON converter runs 100% client-side in your browser using JavaScript. No data is sent to any server. Your CSV data remains on your device throughout the entire conversion process.
How does the tool handle quoted CSV fields?
The parser correctly handles RFC 4180 compliant CSV: fields wrapped in double quotes can contain commas, newlines, and other special characters without breaking the parse. Double quotes within quoted fields are escaped as two consecutive quotes ("").
What output formats are available?
Two output formats: 'Array of objects' creates [{"name":"John","age":30},...] using headers as keys (most common), while 'Array of arrays' creates [["name","age"],["John",30],...] preserving the tabular structure.
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