This is a parser for React Server Components (RSC) when sent over the network. React uses a format to represent a tree of components/html or metadata such as requiered imports, suspense boundaries, and css/fonts that needs to be loaded.
I made this tool to more easily let you understand the data and explore it visually.
With this tool:
Without this tool:
- Go to a site that uses the NextJS App router or generally is based on React Server components.
- Open the network tab in your dev tools
- Reload.
- Look for fetch responses the payload roughly looks like json, but each like starts with something like
O:,1:I,b:or similar. - Copy the text and paste it into the form on https://rsc-parser.vercel.app/
- Explore!
Please make an issue on https://github.com/alvarlagerlof/rsc-parser/issues/new and include the text content that the parser was unable to handle.
Currently this is is a standalone site, which means that it is not able to handle live streaming payloads, but I plan on exploring using doing this as a browser extension or possibly an embedded debugging component similar to the React Query devtools. The latter would probably need a service worker to intercept network requests. If you know anything about this I'd love to talk. I'm @alvarlagerlof on Twitter.
I'm also considering a rendering of the component tree that looks more like your code itself. I think it should be possible to replicate it pretty well. In this area I am also considering attempting to combine the different rows in the stream and stitch them together into a single tree. Done in #7
Another area of improvement is better rendering of sizes of rows/objects. Browsers and servers have compression like gzip and brotli, but this codes does not take that into account.
I do want to note that all of this was put together quickly, so it likely needs a bit of refactoring to make more sense.
This site is made in Next.js using the App router, but all of interesting things are inside a single server component.
First, run the development server:
npm run dev
# or
yarn dev
# or
pnpm devOpen http://localhost:3000 with your browser to see the result.