The primary and widely accepted MIME type for JSON content is application/json. This MIME type is specified in the official JSON specification (RFC 8259). It is the standard and recommended way to indicate that the content is JSON data.

application/json

Using application/json is considered a best practice and is widely supported across browsers and platforms. When serving JSON data over HTTP, you should set the Content-Type header in the HTTP response to application/json.

For example, in an HTTP response header:

Content-Type: application/json

This helps browsers and other clients correctly interpret the content.

While the other MIME types you mentioned (application/x-javascript, text/javascript, text/x-javascript, text/x-json) have been used historically or in specific contexts, they are not the standard for JSON. It’s generally recommended to stick with application/json to ensure consistency, interoperability, and compatibility with modern web standards.

In summary, for JSON content, use application/json. It’s widely supported, recognized, and aligns with the official JSON specification.