Check if key exists in JSON object using jQuery

Question

I have done AJAX validation and validated message is returned as a JSON  array  Therefore I need to check whether the keys  like name and email  are in that JSON array          name              isEmpty    Value is required and can t be empty              email              isEmpty    Value is required and can t be empty            Only if the key name is present  I need to write an error message to the name field   Following is the code to display an error if fields is entered  if  obj  name   isEmpty                                                    name   after c1     lt label class  error  gt     obj  name    isEmpty       lt  label gt                                              if  obj  email    isEmpty                     email   after c4     lt label class  error  gt     obj  email    isEmpty       lt  label gt         But if the name field is entered  it will not be in JSON array  So the checking statement  if  obj  name    isEmpty            will result in the following error      obj name not found    It is not necessary to have key name in  the array  At same time I need to check for this to display the error if the array possesses the key name

User · Answer

No need of JQuery simply you can do  if yourObject  email         what if this property exists      as with any value for email will return you true  if there is no such property or that property value is null or undefined will result to false

User · Answer

Use JavaScript s hasOwnProperty   function   if  json object hasOwnProperty  name            do struff

User · Answer

if you have an array  var subcategories   name  test  desc  test      function hasCategory nameStr            for let i 0 i lt subcategories length i                 if subcategories i  name   nameStr                   return true                                  return false          if you have an object  var category  name  asd  test       if category hasOwnProperty  name      or category name   undefined    return true   else     return false

User · Answer

if typeof theObject  key       undefined           key exists  do stuff      or  if typeof theObject key     undefined          object exists  do stuff     I m writing here because no one seems to give the right answer    I know it s old      Somebody might question the same thing

[javascript] Check if key exists in JSON object using jQuery

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