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CSV / JSON Converter - Convert Data Between CSV and JSON Format

Convert data easily between CSV and JSON format directly in your browser. Supports quoted values, custom delimiters and complex data structures per RFC 4180. Ideal for data migration, API integrations and converting test data between different formats.

Note:All generated data is entirely fictional and not suitable for use as real personal information.

CSV and JSON formats explained

CSV (Comma-Separated Values) is a plain-text tabular format where each row is a line and values are separated by a delimiter — typically a comma, but semicolons (;) are common in European locales where commas are used as decimal separators. The first row typically contains column headers.

When to use CSV vs JSON

  • CSV — Best for flat, tabular data. Natively supported by Excel, Google Sheets, and most database import tools. Compact and universally readable.
  • JSON — Best for hierarchical or nested data. Required by most REST APIs and JavaScript applications. Supports mixed data types per field.

Common CSV edge cases

  • Quoted fields — Values containing commas or newlines must be wrapped in double quotes: "New York, NY".
  • Escaped quotes — A literal double-quote inside a quoted field is represented as two double-quotes: "He said ""hello""".
  • Line endings — CSV files may use CRLF (Windows) or LF (Unix). Most parsers handle both, but inconsistencies can cause import issues.

Use cases for CSV/JSON conversion

Convert CSV to JSON when feeding data into REST APIs or JavaScript applications. Convert JSON to CSV when importing API responses into Excel or database tools, or when preparing bulk data for systems that only accept flat files. Combine this converter with the dataset generator to create test data in any format, or use the JSON formatter to validate the output after conversion.

Frequently Asked Questions

How does the CSV to JSON conversion work?
When converting CSV to JSON, the first row of the CSV file is used as property keys for the JSON objects. Each subsequent row is converted to a JSON object where the values are mapped to the corresponding keys from the header. The end result is a JSON array of objects. The converter automatically detects the data type (string, number, boolean, null) of each value.
Are special characters and quoted values correctly processed?
Yes. The converter supports the full CSV format per RFC 4180: quoted values (values in double quotes), commas and line breaks within quoted values, escaped quotes (double quotes within quotes), and custom delimiters (semicolon, tab, pipe). This guarantees correct conversion of complex CSV files exported from Excel, databases, or other sources.
Can I also convert JSON to CSV?
Yes. The converter works in both directions. When converting JSON to CSV, the property names of the first object are used as CSV headers. Nested objects are automatically flattened with dot notation as the key separator. Arrays are included as comma-separated values. The result is a valid CSV file that you can open in Excel or import into your database.
Is my data sent to a server when converting?
No. All conversion takes place entirely client-side in your browser. No data is sent to a server or stored. This makes the tool safe for converting sensitive data such as customer data, financial data, or other confidential information. The privacy of your data is fully guaranteed.
What do developers use a CSV/JSON converter for?
The CSV/JSON converter is widely used for: converting database exports (CSV) to JSON for use in APIs and web applications, converting API responses (JSON) to CSV for analysis in Excel or Google Sheets, data migration between systems that expect different formats, preparing test data in the correct format for test automation, and transforming configuration data between CSV and JSON representations.

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