Have a look at the wp-api code for pages (which are custom post types).
You can modify the code, changing pages to whatever your post type is called (just be careful about doing a search and replace for all "pages" as some of them are wordpress function calls or filters)
<?php
/**
* Page post type handlers
*
* @package WordPress
* @subpackage JSON API
*/
/**
* Page post type handlers
*
* This class serves as a small addition on top of the basic post handlers to
* add small functionality on top of the existing API.
*
* In addition, this class serves as a sample implementation of building on top
* of the existing APIs for custom post types.
*
* @package WordPress
* @subpackage JSON API
*/
class WP_JSON_Pages extends WP_JSON_CustomPostType {
/**
* Base route
*
* @var string
*/
protected $base = '/pages';
/**
* Post type
*
* @var string
*/
protected $type = 'page';
/**
* Register the page-related routes
*
* @param array $routes Existing routes
* @return array Modified routes
*/
public function register_routes( $routes ) {
$routes = parent::register_routes( $routes );
$routes = parent::register_revision_routes( $routes );
$routes = parent::register_comment_routes( $routes );
// Add post-by-path routes
$routes[ $this->base . '/(?P<path>.+)'] = array(
array( array( $this, 'get_post_by_path' ), WP_JSON_Server::READABLE ),
array( array( $this, 'edit_post_by_path' ), WP_JSON_Server::EDITABLE | WP_JSON_Server::ACCEPT_JSON ),
array( array( $this, 'delete_post_by_path' ), WP_JSON_Server::DELETABLE ),
);
return $routes;
}
/**
* Retrieve a page by path name
*
* @param string $path
* @param string $context
*
* @return array|WP_Error
*/
public function get_post_by_path( $path, $context = 'view' ) {
$post = get_page_by_path( $path, ARRAY_A );
if ( empty( $post ) ) {
return new WP_Error( 'json_post_invalid_id', __( 'Invalid post ID.' ), array( 'status' => 404 ) );
}
return $this->get_post( $post['ID'], $context );
}
/**
* Edit a page by path name
*
* @param $path
* @param $data
* @param array $_headers
*
* @return true|WP_Error
*/
public function edit_post_by_path( $path, $data, $_headers = array() ) {
$post = get_page_by_path( $path, ARRAY_A );
if ( empty( $post ) ) {
return new WP_Error( 'json_post_invalid_id', __( 'Invalid post ID.' ), array( 'status' => 404 ) );
}
return $this->edit_post( $post['ID'], $data, $_headers );
}
/**
* Delete a page by path name
*
* @param $path
* @param bool $force
*
* @return true|WP_Error
*/
public function delete_post_by_path( $path, $force = false ) {
$post = get_page_by_path( $path, ARRAY_A );
if ( empty( $post ) ) {
return new WP_Error( 'json_post_invalid_id', __( 'Invalid post ID.' ), array( 'status' => 404 ) );
}
return $this->delete_post( $post['ID'], $force );
}
/**
* Prepare post data
*
* @param array $post The unprepared post data
* @param string $context The context for the prepared post. (view|view-revision|edit|embed|single-parent)
* @return array The prepared post data
*/
protected function prepare_post( $post, $context = 'view' ) {
$_post = parent::prepare_post( $post, $context );
// Override entity meta keys with the correct links
$_post['meta']['links']['self'] = json_url( $this->base . '/' . get_page_uri( $post['ID'] ) );
if ( ! empty( $post['post_parent'] ) ) {
$_post['meta']['links']['up'] = json_url( $this->base . '/' . get_page_uri( (int) $post['post_parent'] ) );
}
return apply_filters( 'json_prepare_page', $_post, $post, $context );
}
}
Put your custom code in edit or filter etc, and away you go!
ps - don't forget to turn it into a proper plugin! You can add as a new plugin and manage it better that way using:
<?php
/**
* Plugin Name: My JSON App API
* Description: My Route and Endpoint handler for the JSON API
* Dependency: This plugin requires JSON BasicKey Authentication Plugin!!!!
* Author: Blah Blah Blah, plus much original code from the WordPress API Team
* Author URI: https://www.example.com
* Version: 1.2
* Plugin URI: https://www.example.com
*/
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
if (!defined("MY_JSON_API_VERSION")) {
define ("MY_JSON_API_VERSION", "1.2") ;
}
function my_json_api_init() {
global $my_json_api_mobile_users;
$my_json_api_mobile_users = new my_JSON_API_MobileUsers();
add_filter( 'json_endpoints', array( $my_json_api_mobile_users, 'register_routes' ) );
}
add_action( 'wp_json_server_before_serve', 'my_json_api_init' );
json_prepare_post
tojson_prepare_{$post_type}
json_prepare_{$post_type}
and add the specifics in that function{$post_type}
should be replaced by the name of your custom post type, so if post type is project, then it would bejson_prepare_project