Custom documentation templates in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Custom Documentation Templates in Postman

What is the primary purpose of using custom documentation templates in Postman?

A To automatically generate test scripts for API endpoints.

B To monitor API performance metrics in real-time.

C To export API collections as executable code snippets.

D To create personalized API documentation that matches specific branding and formatting needs.

💡 Hint

Think about how documentation can be tailored to fit a company's style or user preferences.

Custom documentation templates allow users to design API docs that reflect their brand and preferred layout, making it easier for others to understand and use the API.

❓ Predict Output

intermediate

Output of a Custom Template Variable in Postman Documentation

Given a custom documentation template in Postman with the variable {{collection.name}}, what will be the output if the collection is named "User API"?

Postman

{{collection.name}}

A User_API

B {{collection.name}}

C User API

D collection.name

💡 Hint

Variables inside double curly braces are replaced by their actual values during rendering.

The variable {{collection.name}} is replaced by the actual name of the collection, which is "User API" in this case.

❓ assertion

advanced

Valid Assertion for Checking Custom Documentation Content

Which assertion correctly verifies that the custom documentation contains the string "Authentication" in a Postman test script?

Postman

pm.test('Documentation contains Authentication', () => {
    // assertion here
});

A pm.expect(pm.documentation).to.have.string('Authentication');

B pm.expect(pm.response.text()).to.include('Authentication');

C pm.expect(pm.response.json().documentation).to.contain('Authentication');

D pm.expect(pm.response.body).to.have.string('Authentication');

💡 Hint

Consider how to check if a text response includes a specific word.

Using pm.response.text() returns the response as plain text, and to.include() checks if the string "Authentication" is present.

🔧 Debug

advanced

Debugging a Custom Template Rendering Issue

A user reports that their custom documentation template in Postman shows the literal text {{collection.description}} instead of the actual description. What is the most likely cause?

A The collection does not have a description set, so the variable remains unresolved.

B The variable syntax is incorrect; it should be <code>{collection.description}</code> without double curly braces.

C The template engine is not enabled for the documentation rendering.

D The variable name is misspelled; it should be <code>{{collection.desc}}</code>.

💡 Hint

Think about what happens if a variable has no value assigned.

If the collection description is empty or missing, the template engine cannot replace the variable, so it shows the literal text.

❓ framework

expert

Best Practice for Maintaining Custom Documentation Templates in Postman

Which approach is best for maintaining and updating custom documentation templates across multiple Postman collections in a team environment?

A Store the custom template in a shared version control system and import it into each collection as needed.

B Manually copy and paste the template into each collection's documentation editor every time an update is needed.

C Use Postman's built-in default templates and avoid custom templates to prevent inconsistencies.

D Create separate templates for each collection without sharing to allow maximum customization.

💡 Hint

Consider how teams usually share and update code or templates efficiently.

Using a shared version control system (like Git) for templates ensures consistency, easy updates, and collaboration across the team.

Practice

1. What is the main purpose of custom documentation templates in Postman?

easy

A. To control the appearance and structure of API documentation

B. To write test scripts for API requests

C. To automate API request execution

D. To generate API mock servers

Solution

1. Step 1: Understand the role of documentation templates

   Custom documentation templates let you change how API docs look and feel, making them clearer and tailored.

2. Step 2: Differentiate from other Postman features

   Test scripts, automation, and mock servers serve different purposes unrelated to documentation appearance.

3. Final Answer:

   To control the appearance and structure of API documentation -> Option A

4. Quick Check:

   Custom templates = control doc look [OK]

Hint: Templates change docs look, not tests or mocks [OK]

Common Mistakes:

• Confusing templates with test scripts
• Thinking templates automate requests
• Mixing templates with mock server setup

2. Which syntax is used inside Postman custom documentation templates to insert dynamic content?

easy

A. [[variable]]

B. {{variable}}

C. %%variable%%

D. ##variable##

Solution

1. Step 1: Identify the templating syntax used by Postman

   Postman uses Handlebars syntax, which uses double curly braces like {{variable}} to insert dynamic content.

2. Step 2: Compare with other common syntaxes

   Other options like [[ ]], %% %% or ## ## are not used in Postman templates.

3. Final Answer:

   {{variable}} -> Option B

4. Quick Check:

   Handlebars = {{variable}} [OK]

Hint: Remember Handlebars uses double curly braces {{}} [OK]

Common Mistakes:

• Using square brackets instead of curly braces
• Confusing with environment variable syntax
• Using percent signs or hashes incorrectly

3. Given this snippet in a Postman custom documentation template:

{{#each requests}}
- {{name}}
{{/each}}

What will this code output?

medium

A. The word 'requests' repeated multiple times

B. An error because loops are not allowed

C. A list of request names from the collection

D. Nothing, because {{name}} is undefined

Solution

1. Step 1: Understand the Handlebars loop syntax

   The {{#each requests}} block loops over all requests in the collection, outputting each request's name.

2. Step 2: Determine the output of the loop

   Each iteration outputs a dash and the request name, creating a list of request names.

3. Final Answer:

   A list of request names from the collection -> Option C

4. Quick Check:

   Loop over requests outputs names [OK]

Hint: Loops with #each output list items [OK]

Common Mistakes:

• Thinking loops are not supported
• Assuming {{name}} is undefined
• Expecting repeated static text instead of dynamic names

4. You wrote this in a Postman custom documentation template:

{{#each requests}}
- {{name}
{{/each}}

Why does the documentation fail to render correctly?

medium

A. Incorrect loop syntax, should be {{#for requests}}

B. The closing tag {{/each}} is missing

C. The variable 'name' does not exist in requests

D. Missing closing curly brace in {{name}}

Solution

1. Step 1: Check the variable syntax inside the loop

   The variable {{name} is missing a closing curly brace, it should be {{name}}.

2. Step 2: Verify loop syntax and tags

   The loop uses correct {{#each requests}} and closing {{/each}} tags, so those are not the issue.

3. Final Answer:

   Missing closing curly brace in {{name}} -> Option D

4. Quick Check:

   All must have matching braces [OK]

Hint: Check all {{}} pairs are closed properly [OK]

Common Mistakes:

• Using wrong loop syntax like #for
• Assuming variable 'name' is missing
• Forgetting to close the loop tag

5. You want to create a custom documentation template that shows each request's name and description only if the description exists. Which Handlebars syntax correctly achieves this?

hard

A. {{#each requests}}
- {{name}}
{{#if description}}
Description: {{description}}
{{/if}}
{{/each}}

B. {{#each requests}}
- {{name}}
{{#unless description}}
Description: {{description}}
{{/unless}}
{{/each}}

C. {{#each requests}}
- {{name}}
{{#if !description}}
Description: {{description}}
{{/if}}
{{/each}}

D. {{#each requests}}
- {{name}}
{{#exists description}}
Description: {{description}}
{{/exists}}
{{/each}}

Solution

1. Step 1: Use the correct conditional block for existence

   Handlebars uses {{#if variable}} to check if a variable exists and is truthy.

2. Step 2: Verify the loop and conditional structure

   {{#each requests}}
   - {{name}}
   {{#if description}}
     Description: {{description}}
   {{/if}}
   {{/each}}

   correctly loops over requests, shows name, and conditionally shows description only if it exists.

3. Final Answer:

   {{#each requests}} - {{name}} {{#if description}} Description: {{description}} {{/if}} {{/each}} -> Option A

4. Quick Check:

   Use {{#if}} to check existence [OK]

Hint: Use {{#if variable}} to show content only if it exists [OK]

Common Mistakes:

• Using {{#unless}} which shows content when variable is missing
• Trying to negate with ! inside {{#if}} which is invalid
• Using non-existent helpers like {{#exists}}