What is MIME type "application/vnd.sqlite3"?

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

The MIME type application/vnd.sqlite3 identifies files that store data in the SQLite database format.

These files hold structured data for local storage and are used by many applications. They ensure data integrity and support transaction logging through additional files like WAL (write‑ahead logging) and SHM (shared memory).

Files using this MIME type can have multiple file extensions such as DB, SQLITE, DB3, DB-WAL, SQLITE3, SQLITE-SHM, DB-SHM, and even extensions used with Fossil like FSL or FOSSIL.

The main purpose is to store and manage data locally.
It is used in desktop software, mobile apps, and web browsers.
Associated logging files (DB-WAL or SQLITE-WAL) help track changes for data integrity.
SHM files (SQLITE-SHM or DB-SHM) aid in managing shared memory for concurrent access.

This format helps operating systems and applications recognize and handle the file correctly. For more technical details and updates on SQLite, visit the SQLite Homepage.

Associated file extensions

.db, .sqlite, .db3, .db-wal, .sqlite3, .sqlite-shm, .db-shm, .fsl, .sqlite-wal, .fossil

Usage Examples

HTTP Header

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


    Content-Type: application/vnd.sqlite3

HTML

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


    <a href="file.dat" type="application/vnd.sqlite3">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', 'application/vnd.sqlite3');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.db, .sqlite, .db3, .db-wal, .sqlite3, .sqlite-shm, .db-shm, .fsl, .sqlite-wal, .fossil

FAQs

Is it safe to expose files with the application/vnd.sqlite3 MIME type on a public server?

No, typically this is a major security risk. SQLite files often contain sensitive backend data, user credentials, or configuration settings; you should configure your web server (like Apache or Nginx) to deny access to extensions like .db or .sqlite unless the data is explicitly intended to be a public dataset.

How do I configure Apache to recognize application/vnd.sqlite3?

You can add the MIME type to your .htaccess or server config file using AddType application/vnd.sqlite3 .sqlite .db .sqlite3. However, it is usually more important to ensure you have rules blocking web access to these files to prevent data leaks.

What is the difference between application/vnd.sqlite3 and application/x-sqlite3?

The vnd. prefix indicates a vendor-specific media type that is officially registered with IANA, whereas x- usually denotes an experimental or non-standard type. You should prefer application/vnd.sqlite3 as it is the correct, standard identifier for SQLite databases.

Can web browsers display application/vnd.sqlite3 files directly?

No, web browsers cannot render SQLite databases natively like they do images or HTML. If a user navigates to a URL serving this MIME type, the browser will trigger a file download. To view the content, the user must open the file in a tool like DB Browser for SQLite.

Why are .db-wal and .db-shm files associated with this MIME type?

These are temporary helper files used for Write-Ahead Logging (WAL) and shared memory (SHM) to ensure data integrity and support concurrent connections. They are internal components of the database mechanism and should generally not be distributed or downloaded in isolation from the main .db or .sqlite file.

Which file extension is best to use with application/vnd.sqlite3?

While generic extensions like .db are very common, using .sqlite or .sqlite3 is often better because it clearly identifies the specific database format to both users and operating systems.

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.