What is MIME type "text/x-csv"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

text/x-csv is a MIME type that signals a plain text file in the comma-separated values format. It is used for storing tabular data with each value separated by a comma. This format is ideal for data exchange between programs.

Files labeled with this MIME type are commonly saved with the CSV extension. They allow easy import and export of data.

Data interchange: Used to move data between spreadsheets, databases, and other software.
Simple structure: The plain text design makes it easy to read and edit with basic text editors.
Wide support: Many applications recognize both text/x-csv and the standardized text/csv formats.

This MIME type offers a flexible way to manage and share structured data without complex software requirements. For further reading on file types and formats, visit sites like Filext.

Associated file extensions

.csv

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: text/x-csv

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="text/x-csv">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'text/x-csv');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.csv

FAQs

Is text/x-csv the standard MIME type for CSV files?

No, text/csv is the official standard registered with IANA. However, text/x-csv was widely used before standardization and is still frequently encountered in legacy systems or older applications. Modern applications should ideally generate text/csv, but be prepared to accept text/x-csv when reading data.

How do I configure Apache to serve files as text/x-csv?

You can map the file extension to the MIME type in your .htaccess file or server configuration. Add the line AddType text/x-csv .csv to ensure Apache serves files with the .csv extension using this specific type.

What are common aliases for text/x-csv?

Because the CSV format existed long before it was standardized, several MIME types are used interchangeably. Besides text/x-csv, you might encounter text/csv (the standard), application/csv, application/vnd.ms-excel, or text/comma-separated-values depending on the client or server software.

Why does my browser download the CSV file instead of displaying it?

Browsers often download CSVs because the server sends a Content-Disposition: attachment header, or because the browser lacks a built-in viewer for tabular data. To force a download programmatically, ensure your server sends Content-Disposition: attachment; filename="filename.csv" along with the text/x-csv content type.

Are there security risks associated with text/x-csv?

While CSV files are plain text and cannot execute code directly, they are vulnerable to CSV Injection (or Formula Injection). If a file containing malicious formulas is opened in spreadsheet software like Microsoft Excel, it could execute commands. Always validate input before generating CSV files.

How should I handle character encoding with text/x-csv?

To prevent special characters from breaking (mojibake), you should specify the charset in the Content-Type header, such as Content-Type: text/x-csv; charset=utf-8. When opening these files in Excel, including a UTF-8 BOM (Byte Order Mark) at the beginning of the file is often necessary for correct display.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.