Node API

This can be achieved using hook_node_view


<?php
/**
* Basic Node Creation Example for Drupal 7
*
* This example:
* - Assumes a standard Drupal 7 installation
* - Does not verify that the field values are correct
*/
$body_text = 'This is the body text I want entered with the node.';

$node = new stdClass();
$node->type = 'article';
node_object_prepare($node); //Creates default settings for the node of a type
$node->title = 'Node Created Programmatically on ' . date('c');
$node->language = LANGUAGE_NONE; //String constant value for "und"

/* If u have body text do the following below