Pulsars

CSV to JSON Converter — Instant Online Conversion

CSV3 lines
JSON12 lines

CSV (Comma-Separated Values) stores tabular data as plain text, with each row on a new line and values separated by commas or semicolons. JSON (JavaScript Object Notation) represents the same data as an array of objects with key-value pairs. Converting CSV to JSON is essential when importing spreadsheet or database exports into web applications, REST APIs, or NoSQL databases like MongoDB that expect structured JSON input.

When should you convert CSV to JSON?

CSV-to-JSON conversion is most common when migrating data from Excel or Google Sheets into a web application, when feeding tabular data into an API that accepts JSON payloads, or when storing relational data in document-oriented databases. Our converter automatically detects headers from the first row and creates objects with matching keys.

Frequently Asked Questions

How does the CSV to JSON conversion work?

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The converter reads the first row as column headers, then creates a JSON array of objects where each subsequent row becomes an object with header names as keys. Values are automatically type-inferred: numbers stay as numbers, 'true'/'false' become booleans, and everything else is a string.

Does it handle quoted fields and commas inside values?

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Yes. Fields enclosed in double quotes can contain commas, newlines, and other special characters. Double quotes inside quoted fields are escaped with two consecutive quotes (""). This follows the RFC 4180 CSV standard.

What happens if my CSV has missing values?

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Missing values at the end of a row are treated as empty strings. The converter still creates valid JSON with all header keys present — missing fields get an empty string value rather than being omitted.

Can I convert JSON back to CSV?

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Yes! Use the format selectors to swap directions, or try our dedicated JSON to CSV converter. The converter works bidirectionally — edit either panel and the other updates in real time.

Is my data safe?

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Absolutely. All conversion happens in your browser using JavaScript. No data is sent to any server. Your CSV and JSON content never leaves your device.