This scripts is for lazy people who want to get rid of all LinkedIn messages at once. This works with the latest LinkedIn 2018. Tested on 15th April 2018

removeTheConvo.js

var removeTheConvo = function()
{
  try{
    
  $(".msg-thread__topcard-btn--icon").click();

  setTimeout(function(){ 
    $(".msg-topcard__full-width-action-button.delete").click();

    setTimeout(function(){ 
      $(".confirm-delete-btn").click();

      setTimeout(function(){ 
        removeTheConvo();

      }, 300);
    }, 300);
  }, 300);
    
  }catch(err){
  setTimeout(function(){ 
    removeTheConvo();

  }, 1000);
  }
};
removeTheConvo();

Nice one ran it from chrome developer console and it worked :)

Here is an extended code from the above snippet that deletes messages where the subject contains certain string -- it skips other messages by adding a class="passed" -- for different runs you need to refresh the page or open a new tab.

var deleteMessagesMatchSubject = function() {

console.log('Delete with text: ' + window.text);

let els = $('.msg-conversation-listitem');
let i = 0;

while($(els[i]).hasClass('passed') && i <= els.length){
i++;
}

if(i >= els.length) return;

el = els[i];

let txt = $(el).find('.msg-conversation-card__message-snippet-body').text();
if(txt.indexOf(window.text) > -1) {
console.log('Delete this shit: ' + txt);

let link = $(el).find('a');

console.log('link = ' + link);
$(link).click();

setTimeout(()=> {
  removeTheConvo();
}, 1000);

} else {

$(el).addClass('passed');
deleteMessagesMatchSubject();

}
}

var removeTheConvo = function()
{
try{

$(".msg-thread__topcard-btn--icon").click();

setTimeout(function(){
  $(".msg-topcard__full-width-action-button.delete").click();

  setTimeout(function(){
    $(".confirm-delete-btn").click();

    setTimeout(function(){
      deleteMessagesMatchSubject();

    }, 300);
  }, 300);
}, 300);

}catch(err){
setTimeout(function(){
deleteMessagesMatchSubject();

}, 1000);

}
};

window.text = 'Congrat';
deleteMessagesMatchSubject();

This is very helpful however it only deletes what is on my screen not my entire inbox which is HUGE. Can you please help me?

Could you share the code for LinkedIn recruiter? The code works well on the free account.

Thank you.

That doesn't seem to work for me... I get a number or errors...

n {stack: "Error: Attempted to handle event deleteRecord on…n.com/sc/h/br/8gesdixxb0mdd0yupx7pukf2q:1278:384)", description: undefined, fileName: undefined, lineNumber: undefined, message: "Attempted to handle event deleteRecord on <messa…398261248> while in state root.deleted.inFlight. ", …}

any ideas?

Very good! This code only didn´t work to marketing messages.
For this things I have to archive this messages.

Here's an updated one - https://gist.github.com/twhitacre/d4536183c22a2f5a8c7c427df04acc90