i want to build a website using node.js that will keep eye on change in data of API and it will send email if change is detected.
how to query on API every 10 min and detect for changes?
setInterval works only when the client is open. my advice to you is node-cron
that you use the package.
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I'm have built an app that the user save package tracking numbers and then when tapping on them the app sends a request to the parcel provider and gets back the tracking info. Pretty simple.
What i want to do is to create a backend server that stores the user's tracking codes and checks them at regular intervals. When the status change then the user gets a push notification.
My thought is to use a Nodes.js server with a MongoDB database but i'm stuck how to implement the tracking code monitoring on the server. Should i use a timer? Is there a better/simpler approach for this?
I need to find the best possible way to do the following task.
I have different users let's say (over 500) and all users have a scheduled function that need to be run twice every day. But if any of the user's phone is off. Then of course that function wont work since its code is written on client side.
now what i want to do is Run a scheduled function in the backend using Node js, but idk how to run that for every user. (note : every user has different schedules). Thats why i wrote that in client side, but with with a possibility of phone might be switched off so its bit off to do that.
What should i do in this scenario? any leads?
Currently, I have figured out how to make API calls to YouTube Data Api and getting the number of likes of any video. And I'm making the call every minute. I do not know, however, how to update the corresponding element in html with the updated value.
Previously, I had made API calls in app.get and then updated using response.send() but that meant that my number would only update everytime I reload the page. Then I took the code block out of app.get but realised I had no way of update the UI with updated numbers from the API call.
I would like to ask how I can go about doing this. Thank you.
for that, you can use WebSocket module
Websocket is just a protocol like HTTP and it provides a persistent connection between a client and server that both parties can use to start sending data at any time.
Websocket is also provided by many front-end frameworks such as flutter, native android, react native etc.
I have an app that is hitting the rate limit for an API which is hurting the user experience. I have an idea to solve this but have no idea if this is what should be done ideally to solve this issue. Does this idea makes sense and is it a good way to solve this issue? And how should I go about implementing it? I'm using react-native and nodejs.
Here is the idea:
My app will request the data from a "middleman" API that I make. The middle man API will request data once per minute from the main API that I am having the rate limit problem with (this should solve the rate limit issue then) then store it for the one minute until it updates again. I was thinking the best way to do this is spin a server on AWS that requests from the other API every minute (Is this the easiest way to get a request every minute?) then store it on either a blank middleman webpage (or do I need to store it in a database like MongoDB?). Then my app will call from that middleman webpage/API.
Your idea is good.
Your middleman would be a caching proxy. It would act just as you stated. Hava a look at https://github.com/active-video/caching-proxy it does almost what you want. It creates a server that will receive requests of URLs, fetch and cache those, and serve the cached version from now on.
The only downside is that it does not have a lifetime option for the cache. You could either fork to add the option, or run a daemon that would delete the files that are too old to force a re-fetch.
EDIT:
A very interesting addition to the caching-proxy would be to have a head request to know if the result changed. While this is not provided by all API, this could become useful if yours is displaying such info. Only if HEAD requests do not count toward your API limits...
I have a website which can have up to 500 concurrent viewers, with data updated every three seconds. Currently each user has an AJAX object which calls a web-page every three seconds which queries a DB and returns with the results.
What I would love to do is have each client get a socket to a node.js object, this node.js would poll the DB every 3 seconds for updated data, if it had updated data it would then be announced (ideally through JSON) and each client would then have the data pushed to it and update the page accordingly.
If this is possible, does anyone have a recommendation as to where I start? I am fairly familiar with JS but node.js seems to confuse me.
Thanks
I myself have quite few experience with node.js.
It is absolutely doable and looks like the perfect use case for node.js.
I recommend starting with an Express Tutorial and later on use socket.io.
I don't know which DBMS you are using, but there probably is a nice package for that as well. Just look through this list.