Write Cleaner Apex Code with Multiline Strings and Using String.template() — Summer ’26 Feature

Introduction

Salesforce Summer ’26 introduces one of the most developer-friendly Apex enhancements in recent years — Multiline Strings and the new String.template() method.

Until now, developers had to rely heavily on string concatenation (+) or index-based String.format() calls while building JSON payloads, SOQL queries, HTML templates, emails, or long text blocks. As a result, Apex code often became difficult to read, debug, and maintain.

However, with this new feature, writing large text blocks in Apex becomes significantly cleaner and more readable.

What’s New in Summer ’26?

Salesforce now allows developers to:

Create multiline strings using triple single quotes (''')
Perform named variable interpolation using String.template()
Avoid repetitive string concatenation
Replace index-based placeholders from String.format()

This feature is available in all API versions and works in both Lightning Experience and Salesforce Classic.

1. Multiline Strings in Apex

Previously, developers had to write long strings like this:

			
String payload = '{' +
    '"Name":"John Doe",' +
    '"Type":"Customer",' +
    '"City":"New York"' +
'}';

		

Although functional, this approach quickly becomes messy for large payloads.

Summer ’26 Way ✅

Now you can directly write formatted multiline strings using triple quotes:

			
String payload = '''
{
    "Name" : "John Doe",
    "Type" : "Customer",
    "City" : "New York"
}
''';

		

As a result:

The code becomes cleaner
JSON payloads become readable
Maintenance becomes easier
Debugging improves significantly

2. `String.template()` — Named Variable Interpolation

Salesforce also introduced the new String.template() method.

Previously, developers used String.format() like this:

			
String result = String.format(
    'Hello {0}, your order {1} is confirmed.',
    new List<String>{'John', 'ORD-1001'}
);

The major issue here is that developers must remember placeholder indexes ({0}, {1}, etc.).

Therefore, maintaining large templates becomes difficult.

Summer ’26 Solution ✅

Now developers can use descriptive variable names:

			
String message = '''
Hello ${customerName},
Your order ${orderNumber} is confirmed.
'''.template(new Map<String, Object>{
    'customerName' => 'John',
    'orderNumber' => 'ORD-1001'
});

		

This approach is:

More readable
Easier to maintain
Less error-prone
Better for team collaboration

Benefits Over Existing Apex Code

1. Better Readability

Large JSON or HTML blocks now look exactly like their final output.

Before

			
String body = '<html>' +
              '<body>' +
              '<h1>Hello</h1>' +
              '</body>' +
              '</html>';

		

After

			
String body = '''
<html>
    <body>
        <h1>Hello</h1>
    </body>
</html>
''';

		

2. Easier Maintenance

With named placeholders, developers no longer need to track numeric indexes.

Old Approach

String.format('User {0} created account {1}', values);

New Approach

			
'''
User ${userName} created account ${accountName}
'''.template(valueMap);

As a result, future modifications become safer and faster.

3. Reduced Concatenation Errors

Previously, developers frequently missed:

commas
quotes
spaces
newline characters

Now the structure remains intact naturally.

4. Cleaner HTTP Integrations

This enhancement is especially useful while working with:

REST API payloads
GraphQL requests
Email templates
Dynamic SOQL
HTML generation
Logging frameworks

Real-World Example 1 — HTTP Callout JSON Payload

Before Summer ’26

			
String payload = '{' +
'"accountName":"' + acc.Name + '",' +
'"industry":"' + acc.Industry + '"' +
'}';

This becomes difficult to manage for larger payloads.

After Summer ’26 ✅

			
String payload = '''
{
    "accountName": "${accountName}",
    "industry": "${industry}"
}
'''.template(new Map<String, Object>{
    'accountName' => acc.Name,
    'industry' => acc.Industry
});

		

Why This Is Better

Cleaner integration code
Easier debugging
Faster onboarding for new developers
Reduced formatting mistakes

Real-World Example 2 — Dynamic HTML Email Template

Before

			
String emailBody = '<html>' +
'<body>' +
'<h2>Hello ' + contact.Name + '</h2>' +
'<p>Your case is resolved.</p>' +
'</body>' +
'</html>';

		

After Summer ’26 ✅

			
String emailBody = '''
<html>
    <body>
        <h2>Hello ${contactName}</h2>
        <p>Your case is resolved.</p>
    </body>
</html>
'''.template(new Map<String, Object>{
    'contactName' => contact.Name
});

		

Benefits

HTML structure remains readable
Easier collaboration with frontend/email teams
Simpler future enhancements

Real-World Example 3 — Dynamic SOQL Query Construction

Before

			
String query = 'SELECT Id, Name FROM Account ' +
               'WHERE Industry = \'' + industry + '\'';

After Summer ’26 ✅

			
String query = '''
SELECT Id, Name
FROM Account
WHERE Industry = '${industry}'
'''.template(new Map<String, Object>{
    'industry' => industry
});

		

Benefits

Cleaner query formatting
Better readability
Easier debugging of complex queries

Note: Always use binding wherever possible to avoid SOQL injection risks.

Important Things to Know

Multiline String Syntax

Use triple single quotes:

			
'''
Your Text Here
'''

Variable Interpolation Syntax

Use:

${variableName}

inside the string.

Inject Values Using

.template(Map<String, Object>)

Complete Example

			
String formatted = '''
{
    "Account": "${accountName}",
    "Last Updated": "${date}"
}
'''.template(new Map<String, Object>{
    'accountName' => 'My Account',
    'date' => DateTime.now()
});
System.debug(formatted);

		

Final Thoughts

The new Multiline Strings and String.template() functionality in Salesforce Summer ’26 is a major quality-of-life improvement for Apex developers.

Although the feature looks simple at first glance, it significantly improves:

code readability
maintainability
developer productivity
collaboration
integration development

Most importantly, it helps Apex code look modern and structured, similar to features already available in many popular programming languages.

If your project contains:

large JSON payloads
complex email templates
dynamic queries
REST integrations
HTML generation

then this Summer ’26 enhancement will immediately improve your development experience.