nodejs-stream

问题 I would appreciate insight from anyone who can suggest the best or better solution in editing large files anyway ranges from 1MB to 200MB using nodejs. Our process needs to merge lines to an existing file in the filesystem, we get the changed data in the following format which needs to be merged to filesystem file at the position defined in the changed details. [{"range":{"startLineNumber":3,"startColumn":3,"endLineNumber":3,"endColumn":3},"rangeLength":0,"text":"\n","rangeOffset":4,

问题 What I am trying to do is download an image from google into my system repository in the project folder /download . Next, I am trying to get the image from the download repository and resize and again save the resized image in /thumbnail repository. Below is the code which I have written //Google URL var mainuri = 'http://images.sadhguru.org/sites/default/files/media_files/iso/en/64083-natures-temples.jpg'; var dir = './download'; if (!fs.existsSync(dir)){ fs.mkdirSync(dir); } // CODE TO

问题 Using Express, how can I determine the response has been sent / that the response has been completely written to? app.use((req,res,next) => { if(res.ended){ // } if(res.finished){ // } }); how can I tell if res.end() has been called? I am looking for a boolean I can read on res. 回答1: response.end() will set response.finished if it's been called, as per the documentation. 回答2: Use res.writableEnded (docs). res.finished is deprecated (see). 来源： https://stackoverflow.com/questions/57618325/check

问题 I tried crud Operation using node js and mongodb.all crud operation working fine.but i tried to run get method its showing on;y one record.after i see my code its throwing error (Can't set headers after they are sent).How to solve this issue any one give suggestion. index.js router.get('/', async (req, res,next) => { (async function() { try { await client.connect(); console.log("Connected correctly to server"); const db = client.db('olc_prod_db'); let r = await db.collection('Ecommerce').find

问题 I want to process array of length around 100 000, without putting too much load on CPU. I researched about streams and stumbled upon highlandjs, but i am unable to make it work. I also tried using promises and processing in chunks but still it is putting very much load on CPU, program can be slow if needed but should not put load on CPU 回答1: With node.js which runs your Javascript as single threaded, if you want your server to be maximally responsive to incoming requests, then you need to