Import in node js error

Question

How can I import this code in module.exports ?

I'm pretty new in node js and in js. I want that this code could be used in other routes

 cache = (duration) => {
  return (req, res, next) => {
    let key = '__express__' + req.originalUrl || req.url
    let cachedBody = mcache.get(key)
    if (cachedBody) {
      res.send(cachedBody)
      return
    } else {
      res.sendResponse = res.send
      res.send = (body) => {
        mcache.put(key, body, duration * 1000);
        res.sendResponse(body)
      }
      next()
    }
  }
}

How can I export it?

I was something like :

module.exports =    cache = (duration) => {
      return (req, res, next) => {
        let key = '__express__' + req.originalUrl || req.url
        let cachedBody = mcache.get(key)
        if (cachedBody) {
          res.send(cachedBody)
          return
        } else {
          res.sendResponse = res.send
          res.send = (body) => {
            mcache.put(key, body, duration * 1000);
            res.sendResponse(body)
          }
          next()
        }
      }
    }

Also I try:

module.export = {
  cache:   function(duration)  {
  return (req, res, next) => {
    let key = '__express__' + req.originalUrl || req.url
    let cachedBody = mcache.get(key)
    if (cachedBody) {
      res.send(cachedBody)
      return
    } else {
      res.sendResponse = res.send
      res.send = (body) => {
        mcache.put(key, body, duration * 1000);
        res.sendResponse(body)
      }
      next()
    }
  }
}
}

But when I try to use it in a get request:

var expCache = require('../../middleware/cache');
    router.get('/:sid/fe',expCache.cache(3000),function(req,res) {

It brings:

TypeError: expCache.cache is not a function

Regards

for loop with git? Sorry, where is the git here?

Heretic Monkey
– Heretic Monkey

2017-01-23 22:33:53 +00:00
Commented Jan 23, 2017 at 22:33 — Heretic Monkey
– Heretic Monkey, Commented Jan 23, 2017 at 22:33

Josh Beam · Accepted Answer · 2017-01-23 22:33:16Z

1

You need to export an object, if you're expecting to be able to call expCache.cache:

module.exports = {
  cache: // your function
}

However, if you want to keep your exported module as it is, just call it like this instead:

// inside middleware/cache:
// module.exports = cache = (duration) => {

var expCache = require('../../middleware/cache');

// you can call it as just a function
router.get('/:sid/fe', expCache(3000), function(req,res) {

answered Jan 23, 2017 at 22:33

Josh Beam

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1 Comment

arnoldssss Over a year ago

I understand this. But it marks something in the = character: SyntaxError: Unexpected token =>

fjc · Accepted Answer · 2017-01-23 22:35:14Z

1

Try

var expCache = require('../../middleware/cache');
router.get('/:sid/fe',expCache(3000),function(req,res) {..

You're exporting your cache function already, not an object containing it (which is how you try to use it for your router).

answered Jan 23, 2017 at 22:35

fjc

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1 Comment

arnoldssss Over a year ago

I tried that, but doesnt work... it doesn't gets through dthe file

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