At the same time, you push a critical bug fix and redeploy the application. It can also occur if the browser is able to download the chunk file, but the downloaded file is an outdated one.Īssume a user is using your app, he has downloaded the main entrypoint file which is, in turn, going to download chunk1.js, chunk2.js, chunk3.js, … whenever required. The relevant chunk files cannot be found or are outdatedĪgain, this can occur because your browser is not able to find and/or download the chunk file, maybe because the file does not exist, but also because of the hundreds of reasons for internet failure (proxies, firewalls, outages etc.). A possible reason for this is that you have antivirus, browser extensions, proxies, or ad blocking software that may be modifying the file contents, resulting in it not matching the checksum. (For more information on why this is important and how it’s done you can refer to Subresource Integrity - Web security | MDN). This can occur when the checksum of the received file does not match the integrity attribute of the script tag. There are a couple reasons you may have encountered this error: The checksum validation for the JavaScript file failed To recap, the Chunk Load Error occurs when the browser encounters an error in fetching some JavaScript files, which were dynamically imported. The multiple JavaScript files used are also known as chunks, and hence the name of the error. Now, whenever there’s an error observed in fetching these other helper JavaScript files, a ChunkLoad Error is thrown. But, for faster loading and better user experience, the JavaScript code can also be broken down into multiple files when it's built and these files are dynamically fetched by the main entry file whenever required. You can store all the JavaScript code into the same file. Most of the time, if you have a small project, a single entry file is enough. Other helper files - The files which are imported by the main entry file whenever required.Main entry file - The file to which the script tag in index.html points to.Whenever a project is built, two types of files are created: The way React, Vue, Angular and similar frameworks work is by downloading JavaScript files and using them to render websites on the browser.

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