CSV to JSON
Convert CSV data to JSON format with customizable options.
Paste CSV data and convert it to JSON in one click. Use the first row as object keys, or turn rows into arrays when your data has no header. The tool supports comma, tab and semicolon delimiters.
How the Conversion Works
When the header option is on, the first row becomes the property names. Every row after that becomes a JSON object. A CSV with 100 data rows and 5 columns becomes a JSON array with 100 objects.
If your CSV has no header row, turn the header option off. The converter will return an array of arrays instead. That is often better for raw exports, logs and quick data checks.
Supported Formats
- CSV - Comma-separated data from spreadsheets, databases and reports.
- TSV - Tab-separated data copied from spreadsheets or database tools.
- Semicolon CSV - Common in regions where commas are used as decimal separators.
- Quoted fields - Double-quoted fields can contain delimiters inside the value.
Common Conversion Problems
Most CSV-to-JSON headaches come from a few predictable issues:
- Wrong delimiter - If your file uses semicolons but comma is selected, each row may collapse into one field.
- Encoding issues - CSV files saved in older encodings can show strange characters. Re-save as UTF-8 if accents or symbols look broken.
- Inconsistent columns - Rows with missing values will produce empty fields. Rows with extra values should be checked before use.
- Data types - The converter detects simple numbers, booleans and null values. Dates and mixed formats still need review in your app.
When to Use a Local Tool Instead
For very large files or sensitive data, convert locally. Python, Node.js and spreadsheet tools can handle big files without pasting private data into a browser page.
How to Use
- Paste your CSV data into the input area.
- Pick comma, tab or semicolon as the delimiter.
- Choose whether the first row is a header.
- Copy the JSON output.
Frequently Asked Questions
How do I use CSV to JSON?
Paste CSV, choose the delimiter and convert. If the first row contains field names, keep header mode on. Check the output with a small sample before using a large file.
Why does my CSV convert incorrectly?
The delimiter may be wrong. Quoted values may also contain commas. Check whether the file uses commas, semicolons or tabs. Broken quotes can make columns shift.
Do I need a header row?
A header row gives JSON objects clear field names. Without it, the tool must create generic keys or arrays. If you plan to send the JSON to an API, clear field names matter.
How are quoted commas handled?
Proper CSV quotes allow commas inside a value. For example, a company name can contain a comma without becoming two fields. Broken quotes are one of the most common CSV problems.
Can I use the output in an API?
Yes, if the JSON validates and field names match what the API expects. Always test with a small sample first. APIs often fail because of one wrong key name or value type.