Query parameters in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are query parameters in an API request?

Query parameters are key-value pairs added to the end of a URL to send extra information to the server. They start after a '?' and are separated by '&'. For example, in https://api.example.com/data?user=123, user=123 is a query parameter.

beginner

How do you add query parameters in Postman?

In Postman, you can add query parameters by clicking the 'Params' tab below the URL field. Then enter the key and value pairs. Postman automatically appends them to the URL.

beginner

Why are query parameters useful in testing APIs?

Query parameters let you test different inputs without changing the main URL. You can check how the API responds to different values, filters, or options by changing these parameters.

beginner

What is the correct format for multiple query parameters?

Multiple query parameters are added by separating each key-value pair with an '&'. For example: ?key1=value1&key2=value2. The order usually does not matter.

intermediate

How does Postman handle encoding of query parameters?

Postman automatically encodes special characters in query parameters to ensure the URL is valid. For example, spaces become %20. This prevents errors when sending requests.

In Postman, where do you add query parameters?

A In the Tests tab

B In the Body tab

C In the Headers tab

D In the Params tab below the URL

Query parameters are added in the Params tab, which appends them to the URL automatically.

What symbol starts the query parameters in a URL?

A ?

B #

C &

D /

Query parameters start after a '?' symbol in the URL.

How do you separate multiple query parameters in a URL?

A ;

B ?

C &

D :

Multiple query parameters are separated by '&' in the URL.

Why is encoding query parameters important?

A To prevent errors with special characters

B To speed up the request

C To make URLs shorter

D To hide the parameters

Encoding converts special characters to a safe format so the URL works correctly.

Which of these is a valid query parameter format?

A #user=123&active=true

B ?user=123&active=true

C /user=123&active=true

D ?user=123;active=true

Query parameters use '?' to start and '&' to separate key-value pairs.

Explain what query parameters are and how you use them in Postman.

Think about how you add filters or options to a web address.

Describe why encoding query parameters is necessary and how Postman helps with it.

Consider what happens if you put spaces or symbols in a URL.

Practice

1. What symbol is used to start query parameters in a URL when making an API request in Postman?

easy

A. Question mark (?)

B. Ampersand (&)

C. Hash (#)

D. Slash (/)

Solution

1. Step 1: Understand URL structure

   Query parameters always start after the base URL with a question mark to separate them from the path.

2. Step 2: Identify the correct symbol

   The question mark (?) is the standard symbol to begin query parameters in URLs.

3. Final Answer:

   Question mark (?) -> Option A

4. Quick Check:

   Query parameters start with ? = C [OK]

Hint: Query parameters always start with ? in URLs [OK]

Common Mistakes:

• Using & to start query parameters instead of ?
• Confusing # (fragment) with query start
• Starting query parameters with /

2. Which of the following is the correct way to add two query parameters named user and id with values alice and 123 respectively in Postman?

easy

A. ?user=alice&id=123

B. &user=alice&id=123

C. ?user=alice#id=123

D. ?user=alice;id=123

Solution

1. Step 1: Start query parameters with ?

   The first query parameter must start with a question mark (?).

2. Step 2: Separate multiple parameters with &

   Additional parameters are separated by an ampersand (&), so user=alice&id=123 is correct.

3. Final Answer:

   ?user=alice&id=123 -> Option A

4. Quick Check:

   First ? then & between parameters = A [OK]

Hint: Start with ? then separate params with & [OK]

Common Mistakes:

• Starting with & instead of ?
• Using # instead of & to separate parameters
• Using semicolon ; instead of &

3. Given the URL https://api.example.com/data?type=fruit&color=red, what will Postman send as query parameters?

medium

A. No query parameters sent

B. type=fruit only

C. type=fruit and color=red

D. color=red only

Solution

1. Step 1: Identify all query parameters after ?

   After the question mark, parameters are separated by &. Here, we have type=fruit and color=red.

2. Step 2: Confirm both parameters are included

   Both parameters will be sent in the request as key-value pairs.

3. Final Answer:

   type=fruit and color=red -> Option C

4. Quick Check:

   Both params after ? separated by & = D [OK]

Hint: All params after ? separated by & are sent [OK]

Common Mistakes:

• Ignoring second parameter after &
• Thinking only first parameter is sent
• Confusing fragment (#) with query parameters

4. You wrote the URL https://api.example.com/search?query=books&limit10 in Postman. What is wrong with this query parameter syntax?

medium

A. Extra '&' before 'limit10'

B. Missing '=' between 'limit' and '10'

C. Query parameters should start with '&' not '?'

D. Using '=' instead of ':' between key and value

Solution

1. Step 1: Check each query parameter format

   Each parameter must be in key=value format. Here, 'limit10' lacks '='.

2. Step 2: Identify missing '=' sign

   Correct syntax should be 'limit=10' to assign value 10 to key 'limit'.

3. Final Answer:

   Missing '=' between 'limit' and '10' -> Option B

4. Quick Check:

   Each param must be key=value, '=' missing = B [OK]

Hint: Check each param has key=value format [OK]

Common Mistakes:

• Omitting '=' between key and value
• Starting query with & instead of ?
• Using ':' instead of '='

5. You want to filter API results in Postman to show only active users with role 'admin' and limit results to 5. Which query parameter string correctly achieves this?

hard

A. ?status=active&role=admin&limit=5&

B. ?status=active&role=admin&limit5

C. ?status=active;role=admin;limit=5

D. ?status=active&role=admin&limit=5

Solution

1. Step 1: Use correct key=value pairs separated by &

   Each filter must be a key=value pair, separated by &. ?status=active&role=admin&limit=5 uses correct syntax.

2. Step 2: Avoid syntax errors like missing '=' or wrong separators

   ?status=active&role=admin&limit5 misses '=' in limit, C uses semicolons instead of &, D has extra trailing & which is invalid.

3. Final Answer:

   ?status=active&role=admin&limit=5 -> Option D

4. Quick Check:

   All params key=value separated by & = A [OK]

Hint: Use key=value pairs separated by & without extra symbols [OK]

Common Mistakes:

• Missing '=' in parameters
• Using semicolons instead of &
• Adding extra & at the end