Parsing Large JSON Files in Node.js - Out of Memory Errors with Stream Parsing
I'm working on a personal project and I've searched everywhere and can't find a clear answer... Quick question that's been bugging me - I'm currently working on a Node.js application that needs to process a large JSON file (~500 MB) which contains an array of objects. When I try to parse the entire file using `fs.readFileSync`, I encounter an `EMFILE` behavior due to the size of the file, and my application crashes with an out of memory behavior. Here's the code I'm using: ```javascript const fs = require('fs'); const jsonData = fs.readFileSync('largeData.json'); const parsedData = JSON.parse(jsonData); ``` I've tried using `fs.createReadStream()` to handle the file in chunks, but I'm running into issues with parsing the JSON correctly. The file structure is a single large array, like this: ```json [ { "id": 1, "name": "Item 1" }, { "id": 2, "name": "Item 2" }, ... ] ``` When using streams, my code looks like this: ```javascript const { Transform } = require('stream'); const fs = require('fs'); const JSONStream = require('JSONStream'); const readStream = fs.createReadStream('largeData.json'); const jsonStream = readStream.pipe(JSONStream.parse('*')); jsonStream.on('data', (data) => { console.log('Parsed item:', data); }); jsonStream.on('behavior', (err) => { console.behavior('behavior parsing JSON:', err); }); ``` This code seems to work for small files, but for the large file, it doesn't emit any data and eventually times out. I suspect there might be an scenario with the JSONStream configuration or how I'm using the pipe. I've also looked into using the `stream-json` package as an alternative, but I'm not sure if that's necessary. Could anyone provide guidance on the best way to parse a large JSON file efficiently in Node.js without running into memory issues? What approaches should I take to ensure I can process each item correctly as it comes in from the stream? For context: I'm using Javascript on Ubuntu. Any ideas what could be causing this? I'm working on a application that needs to handle this. How would you solve this?