What is MIME type "application/json-patch+json"?

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

application/json-patch+json is a MIME type for JSON Patch documents. It defines a sequence of operations to modify a JSON object. Each operation specifies an action such as add, remove, or replace.

It works by indicating how changes should apply to a JSON resource. The document itself is a list of instructions. This approach avoids resending the entire data when only parts need updating.

Efficient Updates: Only the differences are sent over the network.
Standardized Operations: It follows rules set out in the RFC 6902 standard.
Interoperability: Many APIs and services use it to process partial modifications.

Files using this MIME type may use the extension JSON-PATCH. This format is popular in environments that need precise control over modifications, such as web services and applications that employ the HTTP PATCH method.

Associated file extensions

.json-patch

Usage Examples

HTTP Header

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


    Content-Type: application/json-patch+json

HTML

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


    <a href="file.dat" type="application/json-patch+json">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/json-patch+json');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.json-patch

FAQs

What is the main purpose of application/json-patch+json?

This MIME type identifies a JSON document that describes changes to be applied to another JSON document. Unlike standard JSON which represents data, application/json-patch+json contains a list of operations (like add, remove, or replace) to modify existing data efficiently.

How does application/json-patch+json differ from application/json?

application/json represents the full state of a resource, whereas application/json-patch+json represents a set of instructions to transition from one state to another. When using application/json with HTTP PUT, you typically replace the entire resource; using JSON Patch with HTTP PATCH allows for partial updates.

Which HTTP method should be used with this MIME type?

You should almost exclusively use the HTTP PATCH method. This MIME type is the standard format for describing partial modifications in a RESTful API, adhering to the specifications defined in RFC 6902.

How do I configure Apache to serve files with the .json-patch extension?

You can add the MIME type directive to your .htaccess file or main configuration. Add the line AddType application/json-patch+json .json-patch to ensure the server sends the correct Content-Type header to clients.

What is the structure of a valid application/json-patch+json file?

The file must contain a JSON array of operation objects. Each object must specify an op (operation), a path (target location), and often a value. For example: [{"op": "replace", "path": "/title", "value": "New Title"}].

What happens if one operation in the patch document fails?

According to the standard, the application of the patch must be atomic. If any single operation within the application/json-patch+json list is invalid or fails, the server must reject the entire request and leave the target document unmodified.

Can I use comments inside an application/json-patch+json file?

No, because the underlying format is strict JSON. Standard JSON does not support comments, so a valid JSON Patch document cannot include them either. You must rely on the data structure itself to convey intent.

Is application/json-patch+json supported by Nginx?

Yes, but you usually need to define it manually in the mime.types file. You can add the entry application/json-patch+json json-patch; to map the MIME type to the file extension, ensuring Nginx serves it correctly.

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.