Wordpress REST API

Question 1

Q: What is the WordPress REST API?

Answer 1

A: A RESTful interface for interacting with WordPress data using HTTP requests.

Question 2

Q: What does REST stand for?

Answer 2

A: Representational State Transfer.

Question 3

Q: What are the primary HTTP methods used in the REST API?

Answer 3

A: GET, POST, PUT, DELETE.

Question 4

Q: What is the base URL for the WordPress REST API?

Answer 4

A: https://example.com/wp-json/.

Question 5

Q: What is the namespace for core WordPress API endpoints?

Answer 5

A: wp/v2.

Question 6

Q: What endpoint retrieves a list of posts?

Answer 6

A: /wp-json/wp/v2/posts.

Question 7

Q: What endpoint retrieves a single post by ID?

Answer 7

A: /wp-json/wp/v2/posts/{id}.

Question 8

Q: What endpoint retrieves a list of pages?

Answer 8

A: /wp-json/wp/v2/pages.

Question 9

Q: What endpoint retrieves all categories?

Answer 9

A: /wp-json/wp/v2/categories.

Question 10

Q: What endpoint retrieves all tags?

Answer 10

A: /wp-json/wp/v2/tags.

Question 11

Q: What are the common methods for authenticating REST API requests?

Answer 11

A: Basic Auth, OAuth, Application Passwords, JWT Authentication.

Question 12

Q: Which authentication method is built into WordPress 5.6+?

Answer 12

A: Application Passwords.

Question 13

Q: What header is required for Basic Auth in REST API requests?

Answer 13

A: Authorization: Basic [Base64EncodedCredentials].

Question 14

Q: What plugin is commonly used for JWT Authentication?

Answer 14

A: The “JWT Authentication for WP REST API” plugin.

Question 15

Q: Why is authentication required for certain REST API actions?

Answer 15

A: To ensure only authorised users can create, update, or delete data.

Question 16

Q: What query parameter is used to filter posts by category?

Answer 16

A: categories.

Question 17

Q: How can you limit the number of results returned by an API request?
q

Answer 17

A: Use the per_page parameter.

Question 18

Q: What parameter is used to paginate results?

Answer 18

A: page.

Question 19

Q: How can you search for posts with a specific keyword?

Answer 19

A: Use the search parameter.

Question 20

Q: How do you filter posts by author?

Answer 20

A: Use the author parameter with the author’s ID.

Question 21

Q: What HTTP method is used to create new posts or pages?

Answer 21

A: POST.

Question 22

Q: What HTTP method is used to update existing posts or pages?

Answer 22

A: PUT or POST.

Question 23

Q: What is the required header for sending JSON data in REST API requests?

Answer 23

A: Content-Type: application/json.

Question 24

Q: How do you specify the post title when creating or updating a post?

Answer 24

A: Include title in the JSON payload.

Question 25

Q: How do you set a post’s featured image in the REST API?

Answer 25

A: Use the featured_media field with the ID of the media item.

Question 26

Q: What HTTP method is used to delete a post or page?

Answer 26

A: DELETE.

Question 27

Q: What parameter is used to force deletion of a post permanently?

Answer 27

A: force=true.

Question 28

Q: What is the default behaviour when deleting a post using the REST API?

Answer 28

A: The post is moved to the trash.

Question 29

Q: How do you delete a category via the REST API?

Answer 29

A: Use the /wp-json/wp/v2/categories/{id} endpoint with the DELETE method.

Question 30

Q: What HTTP status code indicates successful deletion?

Answer 30

A: 200 or 204.

Question 31

Q: What function is used to register a custom REST API route?

Answer 31

A: register_rest_route().

Question 32

Q: What hook is used to initialise custom REST API routes?

Answer 32

A: rest_api_init.

Question 33

Q: What arguments are required for register_rest_route()?

Answer 33

A: $namespace, $route, and $args.

Question 34

Q: What is the purpose of the callback argument in a custom route?

Answer 34

A: It defines the function to execute when the route is accessed.

Question 35

Q: How do you secure a custom REST API route?

Answer 35

A: Use the permission_callback argument to define access rules.

Question 36

Q: Why should you use namespaces for custom routes?

Answer 36

A: To avoid conflicts with core or other plugins’ endpoints.

Question 37

Q: Why is it important to validate and sanitise data in the REST API?

Answer 37

A: To ensure security and data integrity.

Question 38

Q: How do you debug REST API requests?

Answer 38

A: Use tools like Postman, cURL, or the browser console.

Question 39

Q: What header is used to determine the response format?

Answer 39

A: Accept: application/json.

Question 40

Q: How can you improve the performance of REST API queries?

Answer 40

A: Use caching plugins or transients to reduce database queries.