[NEXT-841] FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
Problem
What version of Next.js are you using? 12.0.7 What version of Node.js are you using? 16.6.2 What browser are you using? Chrome / safari What operating system are you using? Mac os How are you deploying your application? other Describe the Bug We have a monorepo with nx wherein we are using next for ssr We have been on next 11 and wanted to move to the next 12 with swc On doing so and making the neccessary changes, our app crashes with We have tried adding more memory but we feel that the issue lies elsewhere [code block] Expected Behavior Should work To Reproduce - upgrade to next 12.0.7 / 12.0.4 and try running the dev server <sub>NEXT-841</sub>
Error Output
ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
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1 Fix
Increase Node.js Memory Limit for Next.js Application
The error 'Reached heap limit Allocation failed - JavaScript heap out of memory' occurs when the Node.js process exceeds the default memory limit of approximately 1.5 GB. This can happen in large applications, especially when using SSR with Next.js and SWC, as they may require more memory during the build or runtime processes.
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- 1
Increase Node.js Memory Limit
Set the Node.js memory limit to a higher value to accommodate the application's memory needs. This can be done by using the `--max-old-space-size` flag when starting your Next.js application.
bashnode --max-old-space-size=4096 node_modules/.bin/next dev - 2
Check for Memory Leaks
Investigate the application for potential memory leaks that could be causing excessive memory usage. Use tools like Chrome DevTools or Node.js built-in profiling tools to monitor memory usage.
bashnode --inspect node_modules/.bin/next dev - 3
Optimize Next.js Configuration
Review and optimize your Next.js configuration settings, such as disabling unnecessary features or optimizing images, to reduce memory consumption.
javascriptmodule.exports = { images: { domains: ['example.com'], }, experimental: { swcMinify: true, }, }; - 4
Upgrade Dependencies
Ensure that all dependencies, including Next.js and any related packages, are up to date. This can help resolve known memory issues in older versions.
bashnpm update - 5
Monitor Resource Usage
After applying the changes, monitor the application's resource usage during development and production to ensure that the memory limit is sufficient and that no further issues arise.
bashtop or htop
Validation
Confirm that the application runs without crashing due to memory issues by testing the development server and checking for any memory-related errors in the console. Additionally, monitor the application's performance and memory usage during runtime.
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Environment
Submitted by
Alex Chen
2450 rep