How to print a stack trace in Node js

Question

Does anyone know how to print a stack trace in Node js

User · Answer

isaacs answer is correct  but if you need more specific or cleaner error stack  you can use this function   function getCleanerStack        var err   new Error       Error captureStackTrace err  getStack       return err stack      This function is inspired directly from the console trace function in NodeJS    Source code  Recent version or Old version

User · Answer

To print stacktrace of Error in console in more readable way   console log ex  ex stack split   n       Example result    Error     Error          at repl 1 7          at REPLServer self eval  repl js 110 21           at Interface  lt anonymous gt   repl js 239 12           at Interface EventEmitter emit  events js 95 17           at Interface  onLine  readline js 202 10           at Interface  line  readline js 531 8           at Interface  ttyWrite  readline js 760 14           at ReadStream onkeypress  readline js 99 10           at ReadStream EventEmitter emit  events js 98 17           at emitKey  readline js 1095 12

User · Answer

you can use node-stack-trace module which is a power full module to track call stacks

User · Answer

If you want to only log the stack trace of the error  and not the error message  Node 6 and above automatically includes the error name and message inside the stack trace  which is a bit annoying if you want to do some custom error handling   console log error stack replace error message        This workaround will log only the error name and stack trace  so you can  for example  format the error message and display it how you want somewhere else in your code    The above example would print only the error name follow by the stack trace  for example   Error       at  Users cfisher Git squashed execProcess js 6 17     at ChildProcess exithandler  child process js 213 5      at emitTwo  events js 106 13      at ChildProcess emit  events js 191 7      at maybeClose  internal child process js 877 16      at Socket  lt anonymous gt   internal child process js 334 11      at emitOne  events js 96 13      at Socket emit  events js 188 7      at Pipe  handle close  as  onclose   net js 498 12    Instead of   Error  Error  Command failed  sh   commands getBranchCommitCount sh HEAD git   rev-lists  is not a git command  See  git --help    Did you mean this          rev-list      at  Users cfisher Git squashed execProcess js 6 17     at ChildProcess exithandler  child process js 213 5      at emitTwo  events js 106 13      at ChildProcess emit  events js 191 7      at maybeClose  internal child process js 877 16      at Socket  lt anonymous gt   internal child process js 334 11      at emitOne  events js 96 13      at Socket emit  events js 188 7      at Pipe  handle close  as  onclose   net js 498 12

User · Answer

As already answered  you can simply use the trace command   console trace  I am here      However  if you came to this question searching about how to log the stack trace of an exception  you can simply log the Exception object   try          if something unexpected   throw new Error  Something unexpected has occurred             catch  e      console error e       It will log      Error  Something unexpected has occurred     nbsp  nbsp  nbsp  nbsp at main  c  Users Me Documents MyApp app js 9 15     nbsp  nbsp  nbsp  nbsp at Object   c  Users Me Documents MyApp app js 17 1     nbsp  nbsp  nbsp  nbsp at Module  compile  module js 460 26     nbsp  nbsp  nbsp  nbsp at Object Module  extensions  js  module js 478 10     nbsp  nbsp  nbsp  nbsp at Module load  module js 355 32     nbsp  nbsp  nbsp  nbsp at Function Module  load  module js 310 12     nbsp  nbsp  nbsp  nbsp at Function Module runMain  module js 501 10     nbsp  nbsp  nbsp  nbsp at startup  node js 129 16     nbsp  nbsp  nbsp  nbsp at node js 814 3      If your Node js version is  lt  than 6 0 0  logging the Exception object will not be enough  In this case  it will print only       Error  Something unexpected has occurred     For Node version  lt  6  use console error e stack  instead of console error e  to print the error message plus the full stack  like the current Node version does    Note  if the exception is created as a string like throw  myException   it s not possible to retrieve the stack trace and logging e stack yields undefined   To be safe  you can use   console error e stack    e     and it will work for old and new Node js versions

User · Answer

In case someone is still looking for this like I was  then there is a module we can use called  stack-trace   It is really popular  NPM Link  Then walk through the trace      var stackTrace   require  stack-trace                  var trace   stackTrace get      trace map function  item        console log new Date   toUTCString              item toString                Or just simply print the trace   var stackTrace   require  stack-trace          var trace   stackTrace get    trace toString

User · Answer

With a readily available Node module  it is possible to get full-length stack traces out of Node  albeit with a minor performance penalty    http   www mattinsler com post 26396305882 announcing-longjohn-long-stack-traces-for-node-js

User · Answer

Any Error object has a stack member that traps the point at which it was constructed   var stack   new Error   stack console log  stack     or more simply   console trace  Here I am

User · Answer

Try Error captureStackTrace targetObject   constructorOpt     const myObj       function c          pass    function b         Error captureStackTrace myObj      c       function a         b      a    console log myObj stack    The function a and b are captured in error stack and stored in myObj

User · Answer

For what I know printing the complete stack trace in nodejs is not possible  you can just print a  partial  stack trace  you can not see from where you came from in the code  just where the Exception occur  That s what Ryan Dahl explains in this youtube video  http   youtu be jo B4LTHi3I  at min 56 30 for being precise  Hope this helps

User · Answer

Now there s a dedicated function on console for that   console trace

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