nodejs 1909 error

Node.js 1909 error solution

Node.js is a widely used JavaScript runtime environment with powerful asynchronous I/O and event-driven features, suitable for building highly scalable web application. However, it is common to encounter various errors while using Node.js, including 1909 errors. This article will introduce the specific causes and solutions of Node.js 1909 error.

1. What is 1909 error

When running Node.js code, sometimes an error message similar to the following will appear:

Error: listen EADDRINUSE: address already in use :::3000
    at Server.setupListenHandle [as _listen2] (net.js:1313:16)
    at listenInCluster (net.js:1361:12)
    at Server.listen (net.js:1447:5)

This is a common Node.js Error, that is, 1909 error. The error code is EADDRINUSE, which means that the service cannot be started because the port is occupied.

2. Reasons for the 1909 error

1. Port occupation

When using Node.js to start the service, if the port is already occupied by other processes , then Node.js will report an EADDRINUSE error.

2. The service is not completely shut down

If the previously started Node.js service is not shut down in time, and the same port is used when the service is started again, an EADDRINUSE error will also occur.

3. Start multiple services concurrently

If multiple Node.js services are started at the same time, if one or more of the services use the same port, then there will be EADDRINUSE error.

3. Methods to solve the 1909 error

1. Release the port

If the port is occupied by other processes, you can close or kill the occupied port. port process to release the port.

In Windows systems, you can use the netstat -ano command in the command line to find the port occupation and the PID of the occupying process. Then use the taskkill /F /PID <pid></pid> command to kill the process to release the port.

2. Use a different port number

If the port cannot be released, you can try using a different port number. You can change the listening port number in the code, such as changing the original listening port 3000 to 3001 port.

3. Waiting for the port to be released

If the problem cannot be solved through the above two methods, you can try to wait for a while and start the service again. The length of the wait period can vary based on system load and operating environment, and usually depends on how long the process occupying the port takes when calling the connection.

4. Install the npm package globallykill-port

You can install the npm package globallykill-port It can be installed based on the port Find the process that needs to be stopped and close it. Use the command:

npm install -g kill-port

After waiting for the installation to complete, you can use the following command to stop the process occupying a certain port (if the port is 3000):

kill-port 3000

The above is the solution to Node.js 1909 There are several wrong methods, and different solutions can be chosen for different situations of the problem.

4. Conclusion

The emergence of Node.js has greatly improved the performance and development efficiency of web applications. However, when using Node.js, we often encounter various problems, among which the 1909 error is an unavoidable problem. This article introduces the causes and countermeasures of the 1909 error, hoping to be helpful to readers.

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