CSV → JSON
Parses CSV to JSON object arrays using the header row as keys with numeric restoration, feeding spreadsheet exports into web APIs and frontends.
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How to convert CSV to JSON
- 1Upload your CSV file by dragging, clicking, or pasting.
- 2Adjust quality settings if needed.
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download your converted JSON file.
About CSV to JSON conversion
CSV is a plain-text comma-separated tabular format following the RFC 4180 standard. It only supports a single flat table, and all content is stored as strings. JSON is a text-based interchange format of key-value pairs and arrays following the RFC 8259 standard, supporting six basic data types. This conversion enables adaptation of flat tables to structured data.
This conversion uses SheetJS for structure parsing. All content from the original CSV remains as string data types. Each CSV row is converted to a JSON object, with table headers retained as object key names. No nested structures are generated. CSV does not support comments, so no comment content exists. The output file size is determined by the number of rows in the original table.
This conversion is suitable for workflows including frontend API data construction, backend configuration file generation, and NoSQL database import. Before use, confirm that CSV headers conform to the key name specifications of the target JSON to avoid parsing errors caused by invalid characters.
CSV vs JSON: technical comparison
| Feature | CSV | JSON |
|---|---|---|
| Released | 1972 | 2001 |
| Developer | RFC 4180 | Douglas Crockford |
FAQ about CSV → JSON
Is there any loss of data quality after conversion?
No content loss occurs to data stored in the original CSV. CSV itself does not distinguish data types, so all content remains as string types after conversion, which conforms to the basic definition of the CSV format.
Will original data types be preserved?
Data types will not be preserved. The CSV format itself does not support distinguishing data types, and all content is stored as strings. All fields in the converted JSON will also be string types.
What size of CSV file is supported?
The single file size limit is 50MB, and only one file can be processed per conversion. If the total uncompressed file size exceeds 256MB or the number of files exceeds 1000, processing will be rejected.
Will files be stored?
No files are stored. Files are uploaded to the server via HTTPS for conversion. Immediately after conversion completes, the server deletes both the source file and the output file, and no data is retained.