DELETE request in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Purpose of DELETE Request in API Testing

What is the main purpose of a DELETE request in API testing?

A To update existing data on the server

B To remove a resource from the server

C To retrieve data from the server without changing it

D To create a new resource on the server

💡 Hint

Think about which HTTP method is used to remove something.

A DELETE request is used to remove a resource from the server. It tells the server to delete the specified data.

❓ Predict Output

intermediate

Output of DELETE Request Response Status

What is the typical HTTP status code returned after a successful DELETE request?

A 404 Not Found

B 201 Created

C 200 OK

D 500 Internal Server Error

💡 Hint

Successful DELETE usually returns a status indicating success without creating anything new.

A successful DELETE request usually returns 200 OK or 204 No Content. 200 OK means the request succeeded and the server returns a response body.

❓ assertion

advanced

Valid Assertion for DELETE Request in Postman Test Script

Which Postman test script assertion correctly verifies a successful DELETE request?

Postman

pm.test("Status code is 200", () => {
    pm.response.to.have.status(200);
});

A pm.test("Status code is 201", () => { pm.response.to.have.status(201); });

B pm.test("Status code is 404", () => { pm.response.to.have.status(404); });

C pm.test("Response body is empty", () => { pm.expect(pm.response.text()).to.eql(null); });

D pm.test("Status code is 200", () => { pm.response.to.have.status(200); });

💡 Hint

Check for the status code that indicates success for DELETE.

The assertion checks that the response status code is 200, which means the DELETE request succeeded.

🔧 Debug

advanced

Debugging a Failing DELETE Request in Postman

You send a DELETE request in Postman but receive a 405 Method Not Allowed error. What is the most likely cause?

A The server does not support DELETE method on the requested URL

B The request body is missing required fields

C The API key is invalid or missing

D The request URL is misspelled

💡 Hint

405 means the method is not allowed on the resource.

A 405 error means the server understands the request method but does not allow it for the requested URL. This usually means DELETE is not supported there.

❓ framework

expert

Automated Test Framework for DELETE Request Validation

In an automated test framework using JavaScript and Postman, which code snippet correctly sends a DELETE request and asserts the response status is 204?

Postman

const pm = require('postman-collection');

// Example snippet

A

pm.sendRequest({ url: 'https://api.example.com/item/123', method: 'DELETE' }, (err, res) => {
  pm.test('Status is 204', () => {
    pm.expect(res.code).to.eql(204);
  });
});

B

pm.sendRequest({ url: 'https://api.example.com/item/123', method: 'POST' }, (err, res) => {
  pm.test('Status is 204', () => {
    pm.expect(res.code).to.eql(204);
  });
});

C

pm.sendRequest({ url: 'https://api.example.com/item/123', method: 'DELETE' }, (err, res) => {
  pm.test('Status is 200', () => {
    pm.expect(res.code).to.eql(200);
  });
});

D

pm.sendRequest({ url: 'https://api.example.com/item/123', method: 'DELETE' }, (err, res) => {
  pm.test('Status is 404', () => {
    pm.expect(res.code).to.eql(404);
  });
});

💡 Hint

DELETE requests often return 204 No Content on success.

The snippet sends a DELETE request and asserts the response status is 204, which means the resource was deleted successfully with no content returned.

Practice

1. What is the main purpose of a DELETE request in Postman?

easy

A. To update existing data on the server

B. To retrieve data from the server

C. To create new data on the server

D. To remove specific data from the server

Solution

1. Step 1: Understand HTTP methods

   HTTP methods define actions on server data. DELETE is used to remove data.

2. Step 2: Match DELETE with its purpose

   DELETE requests specifically remove data, unlike GET (retrieve), POST (create), or PUT (update).

3. Final Answer:

   To remove specific data from the server -> Option D

4. Quick Check:

   DELETE = remove data [OK]

Hint: DELETE means remove data from server URL [OK]

Common Mistakes:

• Confusing DELETE with GET or POST
• Thinking DELETE creates or updates data
• Ignoring the URL's role in specifying data to delete

2. Which of the following is the correct syntax for a DELETE request URL in Postman to delete a user with ID 123?

easy

A. DELETE https://api.example.com/users/delete/123

B. DELETE https://api.example.com/users?id=123

C. DELETE https://api.example.com/users/123

D. DELETE https://api.example.com/delete/users/123

Solution

1. Step 1: Understand RESTful URL conventions

   In REST APIs, the resource ID is usually part of the URL path, not a query parameter for DELETE.

2. Step 2: Identify the correct URL format

   The correct format is the resource path followed by the ID: /users/123.

3. Final Answer:

   DELETE https://api.example.com/users/123 -> Option C

4. Quick Check:

   Resource ID in path = DELETE https://api.example.com/users/123 [OK]

Hint: Use resource path plus ID for DELETE URL [OK]

Common Mistakes:

• Using query parameters instead of path for ID
• Adding extra 'delete' in URL path
• Misplacing the ID before resource name

3. Given this Postman DELETE request code snippet, what will be the expected response status if the deletion is successful?

pm.sendRequest({
  url: 'https://api.example.com/items/45',
  method: 'DELETE'
}, function (err, res) {
  pm.test('Status code is 200 or 204', function () {
    pm.expect(res.code).to.be.oneOf([200, 204]);
  });
});

medium

A. The response status will be 200 OK or 204 No Content

B. The response status will be 500 Internal Server Error

C. The response status will be 201 Created

D. The response status will be 404 Not Found

Solution

1. Step 1: Understand DELETE success status codes

   Successful DELETE requests usually return 200 (OK) or 204 (No Content).

2. Step 2: Analyze the test assertion in code

   The test checks if response code is either 200 or 204, confirming success.

3. Final Answer:

   The response status will be 200 OK or 204 No Content -> Option A

4. Quick Check:

   DELETE success = 200 or 204 [OK]

Hint: Successful DELETE returns 200 or 204 status [OK]

Common Mistakes:

• Expecting 201 Created for DELETE
• Confusing 404 with success
• Ignoring 204 No Content as valid success

4. You wrote this DELETE request in Postman but it fails with a 400 Bad Request error. What is the most likely mistake?

DELETE https://api.example.com/items
Body: { "id": 10 }

medium

A. DELETE requests cannot have a body in Postman

B. The ID should be in the URL path, not in the request body

C. The HTTP method should be POST instead of DELETE

D. The URL is missing the query parameter for ID

Solution

1. Step 1: Understand DELETE request conventions

   DELETE requests usually specify the resource ID in the URL path, not in the body.

2. Step 2: Identify the error cause

   Sending ID in the body causes server to reject request with 400 Bad Request.

3. Final Answer:

   The ID should be in the URL path, not in the request body -> Option B

4. Quick Check:

   ID in URL path for DELETE [OK]

Hint: Put ID in URL path, not body, for DELETE requests [OK]

Common Mistakes:

• Sending ID in request body instead of URL
• Using wrong HTTP method
• Adding unnecessary query parameters

5. You want to test deleting multiple items in Postman using DELETE requests. Which approach correctly applies DELETE requests for multiple IDs [101, 102, 103] following REST best practices?

hard

A. Send one DELETE request per ID with URLs: /items/101, /items/102, /items/103

B. Send a single DELETE request to /items with body {"ids": [101,102,103]}

C. Send one DELETE request to /items?id=101,102,103

D. Send a POST request to /items/delete with body {"ids": [101,102,103]}

Solution

1. Step 1: Review RESTful DELETE usage for multiple resources

   Standard REST APIs usually require one DELETE request per resource ID.

2. Step 2: Evaluate each option

   Send one DELETE request per ID with URLs: /items/101, /items/102, /items/103 sends separate DELETE requests per ID, which is correct. Send a single DELETE request to /items with body {"ids": [101,102,103]} and C misuse body or query parameters. Send a POST request to /items/delete with body {"ids": [101,102,103]} uses POST incorrectly.

3. Final Answer:

   Send one DELETE request per ID with URLs: /items/101, /items/102, /items/103 -> Option A

4. Quick Check:

   One DELETE per resource ID [OK]

Hint: Delete items one by one with separate DELETE URLs [OK]

Common Mistakes:

• Trying to delete multiple IDs in one DELETE request body
• Using query parameters incorrectly for multiple IDs
• Using POST instead of DELETE for deletion