How to create paragraphs item programmatically in D8?

What I know is, now paragraphs on Drupal 8 use entity_reference_revisions maybe you want to take a look in there.

Check how entity_reference_revisions link the paragraphs with the entity who is using it. Remember not only Content Type could use paragraphs.

That indeed looks like the standard way to do it.

You can also use appendItem and/or pass the entire Paragraph entity as the value:

$node->field_content->appendItem($paragraph);

Thanks @derMatze for raising this issue and the solution... landing here from google search :)

Landed here from Google as well, and had to modify a bit to get it to work for my purposes.
I'm using paragraphs with just a text field and an optional image, and a node can have multiple paragraphs attached.
Maybe this will help someone else...

use Drupal\paragraphs\Entity\Paragraph;  // Don't forget to use a little Class...

/**
 * Create a New Paragraph and attach it to it's node
 * @param int $nid
 *  The node id this paragraph should be attached to
 * @param longtext $content
 *  The body text of the paragraph
 * @param int fid
 *  The file id if any, or FALSE
 * 
 */
function CUSTOM_MODULE_create_paragraph($nid, $content, $fid = FALSE) {
  $node = entity_load('node', $nid);
  $paragraph = Paragraph::create(['type' => 'PARAGRAPH_TYPE',]);
  $paragraph->set('TEXT_FIELD_NAME', $content); 
  if ($fid) {
    $file = file_load($fid);
    $paragraph->set('IMAGE_FIELD_NAME', $file);
  }
  $paragraph->isNew();
  $paragraph->save();	
    
  // Grab any existing paragraphs from the node, and add this one 
  $current = $node->get('NODE_FIELD_NAME')->getValue();
  $current[] = array(
      'target_id' => $paragraph->id(),
      'target_revision_id' => $paragraph->getRevisionId(),
    );
  $node->set('NODE_FIELD_NAME', $current);
  $node->save();
}

Please use below namespace..

use Drupal\paragraphs\Entity\Paragraph;

#7 worked for me
Drupal core 8.3.7
Paragraphs 8.x-1.0

#7 works as well as appendItem except for when I open the node and save it I get this:

This entity (paragraph: 43) cannot be referenced.

8.4.2

Scratch that. I'm feeling like an idiot. I was accidentally adding the wrong paragraph type. It added, but I guess it didn't like it.

Here is a better example :

<?php

use Drupal\paragraphs\Entity\Paragraph;

// Create single new paragraph
$paragraph = Paragraph::create([
  'type' => 'paragraph_machine_name',
  'field_machine_name' => 'Field value',
]);
$paragraph->save();

// Create multiple new paragraphs
$multiParagraph1 = Paragraph::create([
  'type' => 'paragraph_machine_name',
  'field_machine_name' => 'Field value',
]);
$multiParagraph2 = Paragraph::create([
  'type' => 'paragraph_machine_name',
  'field_machine_name' => 'Field value',
]);
$multiParagraph1->save();
$multiParagraph2->save();


// Save paragraph to node it belongs to
$newCompanyNode = Node::create([
  'type' => 'node_machine_name',
  'title' => 'new_node_title',
  // Insert a single paragraph
  'node_field_paragraph_machine_name' => array(
    'target_id' => $paragraph->id(),
    'target_revision_id' => $paragraph->getRevisionId(),
  ),
  // Insert multiple paragraphs into the same reference field
  'node_paragraph_field_machine_name' => array(
    array(
      'target_id' => $multiParagraph1->id(),
      'target_revision_id' => $multiParagraph1->getRevisionId(),
    ),
    array(
      'target_id' => $multiParagraph2->id(),
      'target_revision_id' => $multiParagraph2->getRevisionId(),
    ),
  ),
]);

// Makes sure this creates a new node
$newCompanyNode->enforceIsNew();
// Saves the node
// Can also be used without enforceIsNew() which will update the node if a $newCompanyNode->id() already exists
$newCompanyNode->save();

Source :
https://stackoverflow.com/a/48399547/

The #12 here have limitation in case you have an unlimited number of items to add. #7 will work better. Thanks!

Here is a more efficient way for unlimited and nested paragraphs. Note: you do not need to save the paragraphs when creating a new node; the relationship will be assigned automatically.

$parents = [];
foreach($data['parent_paragraph'] as $parent_paragraph) {
        $childs = [];
        foreach($parent_paragraph['child'] as $child) {
                $childs[] = Paragraph::create([
                        'type' => '...',
                        'field_...' => $foo,
                ]);
        }
        
        $parents[] = Paragraph::create([
                'type' => '...',
                'field_...' => $bar
                'field_child' => $childs,
        ]);
}

$new_submission = Node::create([
        'type' => '...',
        'title' => '...',
        'field_paragraphs' => $parents,
]);
$new_submission->save();

Credit to '4k4' on Stack: Source

I want to create Paragraph types can you some one guide me how can i create via programming

@ahaomar the issue queue probably isn't the best place to be asking that. There is the forum section of Drupal.org and/or Drupal Answers. It's more likely that someone will see your question there and have time to answer rather than in the issue queue where the focus is on specific issues within projects.

With that being said, I suggest looking at the code for Paragraph.php and see how the base paragraph is created then maybe looking at a module that extends paragraphs like Bootstrap Paragraphs and see how those are built so that you can get a starting point.

Workable in Drupal 9

function MY_MODULE_create_paragraph($nid, $content, $fid = false)
{
    $node = \Drupal\node\Entity\Node::load($nid);
    $paragraph = Paragraph::create(['type' => 'PARAGRAPH_TYPE',]);
    $paragraph->set('TEXT_FIELD_NAME', $content);
    if ($fid) {
        $file = file_load($fid);
        $paragraph->set('IMAGE_FIELD_NAME', $file);
    }
    $paragraph->isNew();
    $paragraph->save();

    // Grab any existing paragraphs from the node, and add this one
    $current = $node->get('NODE_FIELD_NAME')->getValue();
    $current[] = array(
      'target_id' => $paragraph->id(),
      'target_revision_id' => $paragraph->getRevisionId(),
    );
    $node->set('NODE_FIELD_NAME', $current);
    $node->save();
}

Hi team,
I'm having some issues trying to save some field using paragraphs,
Where i run my code happen this:
The first field has value and second is empty
and the next block the first field is empty and second has value
screenshoot
This is my code:

<?php
$paragraph_1 = Paragraph::create([
    'type' => 'field_from_paragraph',
    'field_item_1' => "abcdefghijk",
]);
$paragraph_icon->save();

$paragraph_2 = Paragraph::create([
    'type' => 'field_from_paragraph',
    'field_item_2' => "123456789",
]);
$paragraph_beneficio->save();

$node = Node::create([
    'type' => 'items',
    'field_from_content_type' => array(
        array(
              'target_id' => $paragraph_1->id(),
              'target_revision_id' => $paragraph_1->getRevisionId()
        ),
        array(
              'target_id' => $paragraph_2->id(),
              'target_revision_id' => $paragraph_2->getRevisionId()
        ),
      ),
    ]);

I don't know what to do to fill both field
Could you please help me?
Regards
Mario

I was looking for a way to create a new node, and populate a multi-value Paragraphs field, and found this issue. I didn't find the solution here, but finally figured it out so here it is:

$cars = [
  array("Volvo",22),
  array("BMW",15),
  array("Land Rover",17),
];
// print_r($cars);

foreach ($cars as $car) {
  $paragraph = Paragraph::create([
    'type' => 'para_item',
    'field_para_item_name' => $car[0],
    'field_para_item_number' => $car[1],
  ]);
  // Add the paragraphs to the node's paragraphs field one by one.
  $node->field_para->appendItem($paragraph);
  $paragraph->save();
}
$node->save();

Sorry to raise old issues but this keeps popping in Google. You should not include references to concrete classes ie. Paragraph but should use service injection:

\Drupal::entityTypeManager()->getStorage('paragraph')->create([
  'type' => 'param_item',
])

Same goes with Node.