Why Custom documentation templates in Postman? - Purpose & Use Cases

The Big Idea

What if you never had to rewrite your API docs from scratch again?

The Scenario

Imagine you have to write API documentation by hand for every new project. You copy-paste sections, change details, and try to keep the style consistent. It feels like rewriting the same thing over and over.

The Problem

This manual way is slow and tiring. You might forget to update some parts or make formatting mistakes. It's easy to lose track of changes, and your team ends up confused with inconsistent docs.

The Solution

Custom documentation templates let you create a reusable format for your API docs. You fill in the details once, and the template automatically generates clear, consistent documentation every time.

Before vs After

✗ Before

Copy-paste old docs, then edit text and links manually.

✓ After

Use a template with placeholders; fill data once; docs auto-generate.

What It Enables

It makes creating and updating API documentation fast, consistent, and error-free.

Real Life Example

A team releases new API versions weekly. With custom templates, they update docs quickly without missing any details, keeping users happy and informed.

Key Takeaways

Manual doc writing is slow and error-prone.

Templates automate and standardize documentation.

Consistent docs improve team and user experience.

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}}