Batch delete patterns in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a batch delete pattern in REST APIs?

A batch delete pattern allows clients to delete multiple resources in a single request, improving efficiency by reducing the number of calls to the server.

intermediate

Name two common HTTP methods used for batch delete operations.

DELETE and POST are commonly used. DELETE is standard but sometimes POST is used with a payload listing items to delete when DELETE with a body is not supported.

intermediate

Why might a REST API use POST instead of DELETE for batch deletes?

Because some servers or clients do not support sending a body with DELETE requests, POST is used to send a list of IDs to delete in the request body.

beginner

What is a common request body format for batch delete operations?

A JSON array or object listing the IDs or identifiers of the resources to delete, for example: {"ids": [1, 2, 3]}

beginner

What HTTP status code usually indicates a successful batch delete?

204 No Content indicates success with no response body. Sometimes 200 OK with details about deleted items is used.

Which HTTP method is standard for deleting a single resource in REST?

A GET

B DELETE

C POST

D PUT

DELETE is the standard HTTP method to remove a resource.

Why might POST be used for batch deletes instead of DELETE?

A Because POST is the only method supported by browsers

B Because POST is faster than DELETE

C Because POST can include a request body listing multiple items

D Because DELETE cannot delete resources

POST allows sending a request body with multiple IDs to delete, which DELETE sometimes does not support.

What is a typical response status code after a successful batch delete?

A 204 No Content

B 500 Internal Server Error

C 404 Not Found

D 301 Moved Permanently

204 No Content means the server successfully processed the request but returns no content.

Which of these is a common way to specify which items to delete in a batch delete request?

A Sending a JSON array of IDs in the request body

B Including IDs in the URL query string only

C Using HTTP headers to list IDs

D Sending IDs as cookies

A JSON array in the request body is a clear and common way to specify multiple IDs.

What is a benefit of batch delete patterns in REST APIs?

A Makes the API slower

B Prevents deletion of resources

C Increases server load unnecessarily

D Reduces the number of HTTP requests needed

Batch deletes reduce network overhead by combining multiple deletions into one request.

Explain how batch delete patterns improve REST API efficiency.

Think about how sending one request instead of many helps.

Describe the difference between using DELETE and POST for batch deletes.

Consider HTTP method limitations and request bodies.

Practice

1.

What is the main advantage of using batch delete in a REST API?

easy

A. It removes multiple items with a single request, saving time.

B. It automatically backs up data before deletion.

C. It encrypts data during deletion.

D. It requires multiple requests for each item.

Solution

1. Step 1: Understand batch delete purpose

   Batch delete is designed to remove many items at once, not one by one.

2. Step 2: Identify the benefit

   Removing multiple items in one request saves time and reduces server load.

3. Final Answer:

   It removes multiple items with a single request, saving time. -> Option A

4. Quick Check:

   Batch delete = single request for many items [OK]

Hint: Batch delete means one request deletes many items [OK]

Common Mistakes:

• Thinking batch delete backs up data
• Confusing batch delete with encryption
• Assuming batch delete needs multiple requests

2.

Which of the following is the correct HTTP method to perform a batch delete in a REST API?

easy

A. GET

B. POST

C. DELETE

D. PUT

Solution

1. Step 1: Recall HTTP methods for REST

   DELETE method is used to remove resources in REST APIs.

2. Step 2: Match method to batch delete

   Batch delete also uses DELETE but with multiple IDs in body or query.

3. Final Answer:

   DELETE -> Option C

4. Quick Check:

   Batch delete uses DELETE method [OK]

Hint: DELETE method removes resources in REST APIs [OK]

Common Mistakes:

• Using POST instead of DELETE for deletion
• Confusing GET with delete operations
• Using PUT which is for updates

3.

Given this REST API call to delete users with IDs 3, 5, and 7:
DELETE /users?ids=3,5,7
What is the expected behavior?

medium

A. Only user with ID 3 is deleted.

B. Users are deleted one by one with separate requests.

C. The server returns an error because multiple IDs are not allowed.

D. Users with IDs 3, 5, and 7 are deleted in one request.

Solution

1. Step 1: Analyze the query parameter usage

   The query parameter 'ids=3,5,7' lists multiple IDs to delete.

2. Step 2: Understand batch delete behavior

   The API deletes all specified users in one DELETE request.

3. Final Answer:

   Users with IDs 3, 5, and 7 are deleted in one request. -> Option D

4. Quick Check:

   Batch delete with multiple IDs = one request deletes all [OK]

Hint: Multiple IDs in query means batch delete in one request [OK]

Common Mistakes:

• Assuming only first ID is deleted
• Thinking server rejects multiple IDs
• Believing multiple requests are sent automatically

4.

Consider this batch delete request:
DELETE /items
with JSON body:
{ "ids": [10, 20, 30] }
But the server responds with 400 Bad Request. What is the likely cause?

medium

A. The JSON format is incorrect.

B. The server expects IDs in the query string, not body.

C. The DELETE method cannot have a request body.

D. The IDs array is empty.

Solution

1. Step 1: Check DELETE method usage

   Some APIs require IDs in query string, not in request body for DELETE.

2. Step 2: Identify server expectation

   Since server returns 400, it likely expects IDs in query parameters, not JSON body.

3. Final Answer:

   The server expects IDs in the query string, not body. -> Option B

4. Quick Check:

   Server expects IDs in query, not body [OK]

Hint: Check if server wants IDs in query or body for DELETE [OK]

Common Mistakes:

• Assuming DELETE cannot have a body always
• Thinking JSON format is wrong without checking
• Ignoring server API documentation

5.

You want to design a batch delete endpoint for a REST API that deletes multiple products by IDs sent in the request body as JSON. Which approach is best practice?

{
  "ids": [101, 102, 103]
}

Choose the correct method and request format.

hard

A. Use DELETE method with JSON body containing IDs array.

B. Use POST method with JSON body containing IDs array.

C. Use DELETE method with IDs in query string separated by commas.

D. Use GET method with IDs in URL path.

Solution

1. Step 1: Understand REST conventions for delete

   DELETE method is standard for removing resources, including batch deletes.

2. Step 2: Check request body usage

   Modern APIs allow DELETE with JSON body to specify multiple IDs for batch delete.

3. Step 3: Evaluate options

   POST is not for deletion, GET is for retrieval, query string can be limited in length.

4. Final Answer:

   Use DELETE method with JSON body containing IDs array. -> Option A

5. Quick Check:

   DELETE + JSON body for batch delete = best practice [OK]

Hint: Use DELETE with JSON body for multiple IDs batch delete [OK]

Common Mistakes:

• Using POST instead of DELETE for deletion
• Putting IDs in query string risking URL length limits
• Using GET which is not for deletion