Convert CSV to JSON – auto-detect separator

CSV (Comma-Separated Values) stores data as rows of text with values separated by commas or semicolons. JSON (JavaScript Object Notation) organizes the same data as an array of key-value objects, where each row becomes an object and each column header becomes a key.

The converter reads the first row of the CSV file as column headers and uses them as property names in each JSON object. Every subsequent row becomes a separate object in the resulting JSON array. For example, a CSV with columns "name,email,age" produces objects like {"name": "...", "email": "...", "age": "..."}.

The output is properly formatted JSON with indentation for readability. All values are preserved as strings by default. The conversion happens entirely in your browser — no data is sent to any server.

CSV files from different sources can have inconsistent formatting. Here are common issues the converter handles:

• Different separators – commas, semicolons, tabs. European exports from Excel often use semicolons because commas are used as decimal separators.
• Quoted values – values containing commas or newlines must be wrapped in double quotes. The converter handles this correctly.
• Unicode and special characters – accented characters, CJK text, and emoji are preserved in the JSON output.
• Empty values – empty cells are converted to empty strings or null in JSON, depending on context.

If conversion fails, check that your CSV has consistent column counts across all rows and that quoted values use proper double-quote escaping.