How to exit in Node js

Question

What is the command that is used to exit   i e terminate the Node js process

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REPL Command Line    Press ctrl   c  twice Type  exit and press enter   Script File  process exit code    Node normally exits with code 0 when no more async operations are pending   process exit 1  should be used to exit with a failure code This will allow us to infer that node didn t close gracefully and was forced to close    There are other exit codes like  3 - Internal JavaScript Parse Error   very very rare   5 - Fatal error in v8 javascript engine  9 - Invalid argument  For full list see node exit codes

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If you re in Windows  go to Task Manager  then go to Processes  look for a process called  node   then click on it with the right button of your mouse and then click the  End Process  option

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You may use process exit  code   function   If you want to exit without a  failure   you use code 0   process exit 0     To exit with a  failure  code 1 you may run   process exit 1     The  failure  code of the failure is specific to the application  So you may use your own conventions for it

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If you re in a Unix terminal or Windows command line and want to exit the Node REPL  either      Press Ctrl   C twice  or type  exit and press Enter  or press Ctrl   D at the start of a line  Unix only

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From code you can use process exit  errorcode   where  errorcode  is an optional integer  0 is the default to indicate success    If you re using the Read Eval Print Loop  REPL   you can use Ctrl   D  or type  exit  Alternatively  on Windows or Linux you can use Ctrl   C  Ctrl   C  On Mac the command is Ctrl   Z  Ctrl   Z

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import mongosse from  mongoose  import dotenv from  dotenv  import colors from  colors  import users from    data users js  import products from    data products js  import User from    models userModel js  import Product from    models productModel js  import Order from    models orderModel js  import connectDB from    config db js   dotenv config    connectDB    const importData   async    gt   try      await Order deleteMany       await Product deleteMany       await User deleteMany        const createdUsers   await User insertMany users      const adiminUser   createdUsers 0   id      sampleProducts   products map product   gt           return     product  user adiminUser              await Product insertMany sampleProducts       console log  Data Imported   green inverse      process exit          success and exit   catch error       consolele log    error   red inverse      process exit 1      error and exit        so here im populating some collections in a db and in the try block if i dont get any errors then we exit it with a success message   so for that we use process exit   with nothing in the parameter  If theres an error then we need to exit with an unsuccessfull message so we pass 1 in the parameter like this   process exit 1   extra  Here by exiting we mean exiting that typical node js program  eg if this code was in a file called dbOperations js then the process exit will exit and wont run any code that follows after process exit

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From the command line   exit is what you want     node  gt   exit     It s documented in the REPL docs  REPL  Read-Eval-Print-Loop  is what the Node command line is called   From a normal program  use process exit  code

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Just a note that using process exit  number   is not recommended practice      Calling process exit   will force the process to exit as quickly as   possible even if there are still asynchronous operations pending that   have not yet completed fully  including I O operations to   process stdout and process stderr       In most situations  it is not actually necessary to call   process exit   explicitly  The Node js process will exit on its own if   there is no additional work pending in the event loop  The   process exitCode property can be set to tell the process which exit   code to use when the process exits gracefully       For instance  the following example illustrates a misuse of the   process exit   method that could lead to data printed to stdout being   truncated and lost      This is an example of what  not  to do  if  someConditionNotMet        printUsageToStdout      process exit 1           The reason this is   problematic is because writes to process stdout in Node js are   sometimes asynchronous and may occur over multiple ticks of the   Node js event loop  Calling process exit    however  forces the   process to exit before those additional writes to stdout can be   performed       Rather than calling process exit   directly  the code should set the   process exitCode and allow the process to exit naturally by avoiding   scheduling any additional work for the event loop      How to properly set the exit code while letting    the process exit gracefully  if  someConditionNotMet        printUsageToStdout        process exitCode   1

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if you want to exit from node js application then write  process exit 1    in your code

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Open the command line terminal where node application is running and press Ctrl   C  if you want to exit a node js application from code   process exit       graceful termination  process exit 1      non graceful termination

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Press Ctrl   C twice  or  exit    gt    To exit  press  C again or type  exit   gt

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As  Dominic pointed out  throwing an uncaught error is better practice instead of calling process exit  code    process exitCode   1  throw new Error  my module xx condition failed

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adding process exit 1    will do the trick for you

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I have an application which I wanted to    Send an email to the user Exit with an error code   I had to hook process exit code  to an exit event handler  or else the mail will not be sent since calling process exit code  directly kills asynchronous events      usr bin nodejs var mailer   require  nodemailer    var transport   mailer createTransport    mail       to   Dave Bowman     from   HAL 9000     subject   Sorry Dave     html   Im sorry  Dave  Im afraid I cant do  lt B gt THAT lt  B gt      transport sendMail mail     process exit 1   process on  exit   function     process exit 1

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The exit in node js is done in two ways   Calling process exit   explicitly  Or  if nodejs event loop is done with all tasks  and there is nothing left to do  Then  the node application will automatically exit   How it works  If you want to force the execution loop to stop the process  yo can use the global variable process which is an instance of EventEmitter  So when you call process exit   you actually emit the exit event that ends all tasks immediately even if there still are asynchronous operations not been done  process exit   takes an exit code  Integer  as a parameter  The code 0 is the default and this means it exit with a  success   While the code 1 means it exit with a  failure

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To exit  let exitCode   1  process exit exitCode    Useful exit codes   1 - Catchall for general errors 2 - Misuse of shell builtins  according to Bash documentation  126 - Command invoked cannot execute 127 -    command not found    128 - Invalid argument to exit 128 n - Fatal error signal    n    130 - Script terminated by Control-C 255   - Exit status out of range

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It depends on the reason why you re willing to exit node js process  but in any case process exit   is the last option to consider  A quote from documentation      It is important to note that calling process exit   will force the   process to exit as quickly as possible even if there are still   asynchronous operations pending that have not yet completed fully    including I O operations to process stdout and process stderr       In most situations  it is not actually necessary to call   process exit   explicitly  The Node js process will exit on it s own   if there is no additional work pending in the event loop  The   process exitCode property can be set to tell the process which exit   code to use when the process exits gracefully    Let   s cover possible reasons why you might be willing to exit node js process and why you should avoid process exit     Case 1 - Execution complete  command line script   If script has reached its end and node interpreter doesn t exit  it indicates that some async operations are still pending  It   s wrong to force process termination with process exit   at this point  It   s better to try to understand what is holding your script from exiting in expected way  And when you settle this  you can use process exitCode to return any result to calling process   Case 2 - Termination because of external signal  SIGINT SIGTERM other   For example  if you   re willing to gracefully shut down an express app  Unlike command line script  express app keeps running infinitely  waiting for new requests  process exit   will be a bad option here because it   s going to interrupt all requests which are in pipeline  And some of them might be non-idempotent  UPDATE  DELETE   Client will never know if those requests are completed or not on server side and it might be the reason of data inconsistency between client and server  The only good solution is to tell http server to stop accepting new requests and wait for pending ones to finish with server close     var express   require  express    var app   express    var server   app listen 80    process on   SIGTERM   function         server close function           console log  Finished all requests                 If it still doesn t exit - see Case 1   Case 3 - Internal error  It s always better to throw an error  you   ll get a nicely formatted stack trace and error message  Upper levels of code can always decide if they can handle error  catch  or let it crash the process  On the other side  process exit 1  will terminate process silently and there will be no chance to recover from this  It might be the only    benefit    of process exit    you can be sure that process will be terminated

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From the official nodejs org documentation   process exit code    Ends the process with the specified code  If omitted  exit uses the  success  code 0   To exit with a  failure  code   process exit 1

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I was able to get all my node processes to die directly from the Git Bash shell on Windows 10 by typing taskkill -F -IM node exe - this ends all the node processes on my computer at once  I found I could also use taskkill   F   IM node exe  Not sure why both - and    work in this context  Hope this helps

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Call the global process object s exit method  process exit    From the docs   process exit  exitcode   Ends the process with the specified code  If omitted  exit uses the  success  code 0  To exit with a  failure  code  process exit 1    The shell that executed node should see the exit code as 1

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As process is global object  you don t need to import any module  The following function exits or kills the current node process      process exit code       process kill process pid       process abort

[node.js] How to exit in Node.js

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