>_
smartdevbox
Open SmartDevBox — free, no sign-up97+ tools · 100% client-side · no account required

CSV to JSON Converter — Convert CSV Data to JSON Online

CSV to JSON Converter parses CSV input (with a header row) and produces a JSON array of objects where each row becomes an object with keys taken from the header.

CSV Format and Parsing Rules

CSV (Comma-Separated Values) is the most widely-supported tabular data format: every spreadsheet application, database, and data analysis tool can import and export it. The de-facto standard is RFC 4180: the first row is the header (column names), subsequent rows are data records, fields are separated by commas, and fields containing commas or newlines are wrapped in double quotes. A literal double-quote within a quoted field is escaped as two double-quotes ("").

The conversion treats the first CSV row as keys for the JSON objects. Each subsequent row becomes one object in the output array. If a row has fewer fields than the header, the missing keys are set to an empty string. SmartDevBox's parser handles RFC 4180 quoting correctly, including multi-line field values enclosed in double quotes.

Working with Spreadsheet Exports

When exporting from Google Sheets or Excel, always choose "CSV UTF-8" to preserve special characters. The default Windows Excel CSV format (CSV) uses a system-specific encoding that may corrupt accented letters and emoji. After exporting, paste the contents directly into SmartDevBox — no file upload needed.

Some CSV exports use semicolons (;) as separators instead of commas. This is common in European Excel configurations where the comma is used as the decimal separator. If the converter produces unexpected results, check whether your CSV uses semicolons and replace them with commas first (use the Find & Replace tool in your text editor).

After conversion, use the JSON Formatter to pretty-print the result and the JSONPath Evaluator to extract specific fields. For the reverse operation — JSON back to CSV — use the JSON to CSV tool.

Common Use Cases

  • Converting spreadsheet exports to JSON for API consumption
  • Transforming database CSV exports for use in JavaScript applications
  • Converting configuration CSVs to JSON for tooling

Frequently Asked Questions

Does the CSV converter handle quoted fields?

Yes. The CSV parser handles RFC 4180 quoting: fields containing commas, quotes, or newlines are quoted with double quotes, and double quotes within fields are escaped as "".

Privacy & Security

This tool runs entirely in your browser using client-side JavaScript. No data is sent to a server — your input never leaves your machine. SmartDevBox has no account system, no usage tracking, and no paid tier. See the Privacy & Security page for full details.

  • JSON to CSV ConverterConvert JSON arrays of objects to CSV format instantly in your browser. Free, no sign-up, 100% client-side.
  • JSON to TSV ConverterConvert JSON arrays to TSV (tab-separated values) format instantly. Free, no sign-up, 100% client-side.
  • JSON FormatterFormat and pretty-print JSON instantly in your browser. Validates syntax and shows error location. Free, no sign-up, 100% client-side.