CSV to JSON Converter – Convert CSV Online (Free Tool)

CSV to JSON parses comma-separated values and emits a JSON array of objects, with the first row used as keys by default. Handles quoted fields, escaped quotes, embedded commas, multi-line values, and a configurable delimiter (comma, tab, semicolon, pipe). The conversion runs entirely in the browser, so confidential spreadsheets never get uploaded.

• Your data stays private — all processing happens locally in the browser
• No telemetry, no tracking pixels, no third-party scripts
• Open-and-go: bookmark the page once and never look for an alternative
• Round-trips cleanly — convert there and back without losing precision or fidelity
• Strict and lenient parser modes for handling messy real-world data

1. Paste your source data into CSV to JSON Converter, or upload a file
2. Confirm the parsed preview looks correct
3. Click Convert to produce the output in the new format
4. Copy the result or download as a file ready for the consuming system

• Importing analyst CSV exports into a JavaScript app or REST API
• Building API request bodies from a spreadsheet of test cases
• Converting Google Sheets data for use in a static site generator
• Pre-processing CSVs for ingestion into MongoDB / Elasticsearch
• Seeding test data from a hand-edited CSV

Commas inside fields broke the parse.

Wrap those values in double quotes ("Smith, John"). The parser respects RFC 4180 quoting rules. Re-export from Excel with "always quote" if available.

Special characters became ?? or .

Encoding mismatch. Re-save the CSV as UTF-8 (Excel: "CSV UTF-8" option) or use the Auto-detect encoding feature.

Numbers came out as strings.

CSV has no types — everything is text. Cast in your code (Number(row.age)) or use a post-processing step to coerce known numeric columns.