JavaScript Heap Out of Memory Error in NestJS Application on Render

Rachit_Mahajan · 2024-07-31T12:02:27.146Z

I’m deploying a NestJS application on Render, and I’m encountering a “JavaScript heap out of memory” error during runtime. Here are the details and the steps I’ve taken so far:

Error Message:

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

Environment:

Node.js Version: 20.15.1
NestJS Version: 9.x
Render Configuration: Using default Render instance

Steps Taken:

Increased Memory Allocation: I added --max-old-space-size=2048 to the start script in package.json to increase the Node.js memory limit. Here is the modified package.json script:
“scripts”: {
“start”: “node --max-old-space-size=2048 node_modules/.bin/nest start”
}

tsconfig.json { "compilerOptions": { "module": "commonjs", "declaration": true, "removeComments": true, "emitDecoratorMetadata": true, "experimentalDecorators": true, "allowSyntheticDefaultImports": true, "target": "es2017", "sourceMap": true, "outDir": "./dist", "baseUrl": "./", "incremental": true, "skipLibCheck": true, "strictNullChecks": false, "noImplicitAny": false, "strictBindCallApply": false, "forceConsistentCasingInFileNames": false, "noFallthroughCasesInSwitch": false, "typeRoots": ["./node_modules/@types", "./types"] } }

Additional Information: The application processes large datasets from a MongoDB database. I’m using Mongoose for database operations. Questions: Are there any additional configurations or optimizations I can apply to further increase memory efficiency? Is there a better way to handle large datasets in NestJS applications to prevent memory leaks? Could there be specific areas in my application code that I should investigate for potential memory issues?

Emmanuel_Umeh · 2024-08-15T12:34:46.182Z

Experiencing same issue here. Only solution i have so far is to increase the instance type but its absurd that it should be maxing out