How can I view network requests (for debugging) in React Native?
I'd like to view my network requests in React Native to help me debug - ideally in the 'Network' tab of Chrome's devtools.
There are some closed issues about this on GitHub (https://github.com/facebook/react-native/issues/4122 and https://github.com/facebook/react-native/issues/934) but I don't entirely understand them. It sounds like I need to undo some of React Native's polyfills and then run some commands with extra debugging flags, and maybe modify some Chrome security settings? And apparently there are some security issues involved in doing this that might make it a terrible idea, but nobody involved in the thread has explicitly stated what they are.
Could somebody provide a step-by-step guide to getting the Network tab working with React Native, as well as an explanation of the security issues involved in doing so?
I'm not sure why no one has pointed out this solution so far. Use React Native Debugger - https://github.com/jhen0409/react-native-debugger! It is the best debugging tool for React Native in my opinion and it gives Network Inspection out of the box.
Take a look at these screenshots.
Right click and select 'Enable Network Inspect'
Right click and select 'Enable Network Inspect'
Debug away!
This is what I've been using in the entry point of my app
const _XHR = GLOBAL.originalXMLHttpRequest ?
GLOBAL.originalXMLHttpRequest :
GLOBAL.XMLHttpRequest
XMLHttpRequest = _XHR
EDIT: frevib linked to more concise syntax below. Thanks frevib!
GLOBAL.XMLHttpRequest = GLOBAL.originalXMLHttpRequest || GLOBAL.XMLHttpRequest;
Explanation:
GLOBAL.originalXMLHttpRequest
refers the Chrome Dev Tools copy of XHR. It is provided by RN as an escape hatch. Shvetusya's solution will only work if the dev tools are open and thus providing XMLHttpRequest
.
EDIT: You will need to allow cross origin requests when in debugger mode. With chrome you can use this handy plugin.
EDIT: Read about the RN github issue that lead me to this solution
I use the following in my app ( Add this in your main app.js entry point file ) :
// To see all the requests in the chrome Dev tools in the network tab.
XMLHttpRequest = GLOBAL.originalXMLHttpRequest ?
GLOBAL.originalXMLHttpRequest :
GLOBAL.XMLHttpRequest;
// fetch logger
global._fetch = fetch;
global.fetch = function (uri, options, ...args) {
return global._fetch(uri, options, ...args).then((response) => {
console.log('Fetch', { request: { uri, options, ...args }, response });
return response;
});
};
The best thing is that it also shows the fetch logs in the console as well which are well formatted.
Screenshot:
On the network tab:
I use Reactotron for tracking network request.