Building a Custom Report Pipeline with Templating Engines: EJS, Handlebars, and GoTempl 🛠️

PDF generation should be seamless, but choosing the right templating engine can be a challenge. With options like EJS, Handlebars, and GoTempl, developers need to balance flexibility, simplicity, and performance when integrating dynamic data into reports.

Today, we’ll dive into the strengths and weaknesses of these popular templating engines and provide real-world examples to help you decide the best fit for your custom report pipeline.

1️⃣ EJS: The JavaScript-Friendly Templating Engine

🚀 Pros: Why Developers Choose EJS

• Familiar for JavaScript developers—works seamlessly with Node.js applications.
• Allows embedding logic directly within templates.
• Flexible and powerful for generating dynamic reports with complex structures.

⚠️ Cons: When EJS Might Not Be Ideal

• Less readable due to inline JavaScript logic (<%= %> syntax can become messy).
• Potential security risks if variables are not properly escaped (<%- %> vs <%= %>).
• Performance overhead due to embedded logic execution at runtime.

🔹 Example: Generating an Invoice with EJS

<h1>Invoice for <%= customerName %></h1>
<p>Total: $<%= totalAmount %></p>

API Payload Example:

{
  "html_template": "<h1>Invoice for <%= customerName %></h1><p>Total: $<%= totalAmount %></p>",
  "data": { "customerName": "Acme Corp", "totalAmount": "1250" },
  "engine": "ejs"
}

✅ Best Use Case: When working with JavaScript-heavy applications where logic within templates is beneficial.

2️⃣ Handlebars: Simple and Secure Templating

🚀 Pros: Why Developers Love Handlebars

• Logic-less templating makes templates clean and readable.
• Built-in security (automatically escapes HTML to prevent injection attacks).
• Great for reusable components and partial templates.

⚠️ Cons: When Handlebars Might Not Work

• Limited flexibility since logic must be handled outside the template.
• More complex workflows when handling advanced conditional logic or loops.

🔹 Example: Generating a Sales Report with Handlebars

<h1>Sales Report for {{company}}</h1>
<p>Total Revenue: ${{revenue}}</p>

API Payload Example:

{
  "html_template": "<h1>Sales Report for {{company}}</h1><p>Total Revenue: ${{revenue}}</p>",
  "data": { "company": "Tech Solutions", "revenue": "500,000" },
  "engine": "handlebars"
}

✅ Best Use Case: When you need clean and maintainable templates with strict separation between logic and presentation.

3️⃣ GoTempl: A Powerful Option for Go Developers

🚀 Pros: Why GoTempl Stands Out

• Optimized for Go applications, making it a natural fit for Go-based report generation.
• Type-safe and performant—compiles templates ahead of time for better execution speed.
• Flexible but structured, offering a balance between EJS and Handlebars.

⚠️ Cons: When GoTempl Might Be a Challenge

• Not as widely adopted as EJS or Handlebars, meaning fewer community resources.
• Less intuitive syntax for developers unfamiliar with Go.

🔹 Example: Creating a Financial Report with GoTempl

<h1>Financial Report for {{.Company}}</h1>
<p>Net Profit: ${{.NetProfit}}</p>

API Payload Example:

{
  "html_template": "<h1>Financial Report for {{.Company}}</h1><p>Net Profit: ${{.NetProfit}}</p>",
  "data": { "Company": "FinanceCorp", "NetProfit": "1,200,000" },
  "engine": "gotempl"
}

✅ Best Use Case: Ideal for Go-based backends where performance and type safety are critical.

4️⃣ Choosing the Right Templating Engine for Your Report Pipeline

🚀 Streamline Your Report Generation with reportgen.io

With reportgen.io, integrating EJS, Handlebars, or GoTempl into your custom report pipeline is effortless.

🔹 Why Use reportgen.io?

✅ Supports multiple templating engines—flexibility for your tech stack. ✅ Scalable and secure—asynchronous and synchronous PDF generation. ✅ Developer-friendly API—easy to integrate with Node.js, Go, and more.

🔗 Ready to build your report pipeline?

• 🎯 Get Your Free API Key
• 📖 Explore the Docs
• 🚀 Start Generating PDFs Today

Which templating engine do you prefer? Drop us a message! 🚀