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What is callback hell in Node.js?

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When there is so much callbacks nested within one another, it causes callback hell.
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IT Professional Trainer with 15 years of experience in IT Industry

When you are using the function inside a function and it really looks like hell, it considered as callback hell. doSomething(param1, param2, function(err, paramx){ doMore(paramx, function(err, result){ insertRow(result, function(err){ yetAnotherOperation(someparameter, function(s){ somethingElse(function(x){ }); }); }); }); }); There...
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When you are using the function inside a function and it really looks like hell, it considered as callback hell.

  1. doSomething(param1, param2, function(err, paramx){
  2. doMore(paramx, function(err, result){
  3. insertRow(result, function(err){
  4. yetAnotherOperation(someparameter, function(s){
  5. somethingElse(function(x){
  6. });
  7. });
  8. });
  9. });
  10. });

There are multiple techniques for dealing with callback hell.

  1. Using Async.js
  2. Using Promises
read less
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