Yes, it will reduce the speed, though only negligibly. But, don’t use it as it’s too easy for a person to read your logs. The answers to this question may give you hints on how to remove them from production.
Does logging slow down application node?
As said above, the console. log is asynchronous and non-blocking, so it would not slow your application too much except one tick for the function invocation. But it is a good habit to use some module to turn some logs of certain level off when deploy it in production instead of using console.
Does console log work in node?
Node. js provides a console module which provides tons of very useful ways to interact with the command line. The most basic and most used method is console. log() , which prints the string you pass to it to the console.
What can I use instead of console log?
Alternative libraries for Console. log() for your next JavaScript Project
- Console. Console is a lightweight library that can be used as an alternative to console.
- Logdown.
- Consola.
- Ololog.
What is window performance now?
The performance. now() method returns a DOMHighResTimeStamp , measured in milliseconds. Note: This feature is available in Web Workers. The returned value represents the time elapsed since the time origin.
How do I maintain logs in node js?
Collect your Node. js logs
- Create a custom logger for your application.
- Incorporate the right levels for your logs.
- Log to the console or to a file.
- Add global metadata to your logs.
- Add metadata directly to individual logs.
- Customize the format of your logs.
- Automatically capture uncaught exceptions in your logs.
When should you use console log?
The JavaScript console log function is mainly used for code debugging as it makes the JavaScript print the output to the console.
What is the point of console log?
console. log specifically is a method for developers to write code to inconspicuously inform the developers what the code is doing. It can be used to alert you that there’s an issue, but shouldn’t take the place of an interactive debugger when it comes time to debug the code.
Where do node logs go?
There is no log file. Each node. js “app” is a separate entity. By default it will log errors to STDERR and output to STDOUT.
Why is Node.js console.log not logging anything?
Set up node, set up the example app from the nodejs.org site. Can start the server fine, but console.log () isn’t actually logging anything. Tried the Javascript console in Chrome, Firefox, and Safari – nothing appears in the log. Also checked Console on my Mac just for kicks, nothing was there either. What am I missing?
Which is slower console.log or empty function?
Actually, console.log is a lot slower than an empty function. Running this jsPerf test on my Chrome 38 gives stunning results: and when the console is open, calling it is as much as 100 000 times slower.
How does console.log affect JavaScript execution performance?
But a few console.log ‘s should not have any noticeable effect. The performance hit will be minimal, however in older browsers it will cause JavaScript errors if the users browsers console is not open log is not a function of undefined. This means all JavaScript code after the console.log call will not execute.
When to use console.log for debugging?
If you need to use console.log for debugging, you might include a script in your production deployment to override the console API, like Paul suggests in his answer. I do it this way to maintain original signature of console methods. In a common location, loaded before any other JS:
