JSONP vs Cross Origin Resource Sharing

Developers should learn JSONP when working with legacy systems or APIs that require cross-domain requests without CORS support, such as in older web applications or third-party services that only offer JSONP endpoints meets developers should learn cors when building web applications that need to make requests to apis or services on different domains, such as single-page applications (spas) using a separate backend api, or when integrating third-party services. Here's our take.

JSONP

Nice Pick

Developers should learn JSONP when working with legacy systems or APIs that require cross-domain requests without CORS support, such as in older web applications or third-party services that only offer JSONP endpoints

Pros

• It is particularly useful for fetching data from external APIs in scenarios where modern CORS headers cannot be implemented, though it has security risks like potential XSS vulnerabilities and should be used cautiously
• Related to: javascript, ajax

Cons

• Specific tradeoffs depend on your use case

Cross Origin Resource Sharing

Developers should learn CORS when building web applications that need to make requests to APIs or services on different domains, such as single-page applications (SPAs) using a separate backend API, or when integrating third-party services

Pros

• It is crucial for security compliance, as browsers block cross-origin requests by default, and understanding CORS helps prevent common errors like 'Access-Control-Allow-Origin' issues and ensures proper data sharing between origins
• Related to: http-headers, web-security

Cons

• Specific tradeoffs depend on your use case

The Verdict

Use JSONP if: You want it is particularly useful for fetching data from external apis in scenarios where modern cors headers cannot be implemented, though it has security risks like potential xss vulnerabilities and should be used cautiously and can live with specific tradeoffs depend on your use case.

Use Cross Origin Resource Sharing if: You prioritize it is crucial for security compliance, as browsers block cross-origin requests by default, and understanding cors helps prevent common errors like 'access-control-allow-origin' issues and ensures proper data sharing between origins over what JSONP offers.

The Bottom Line

JSONP wins

Developers should learn JSONP when working with legacy systems or APIs that require cross-domain requests without CORS support, such as in older web applications or third-party services that only offer JSONP endpoints