PDFox provides a curated set of built-in Handlebars helpers. Custom helpers are not supported — transform data server-side before passing it as data if you need custom logic.
Formatting
Helper
Example
Output
formatCurrency
{{formatCurrency amount "GBP"}}
£1,200.00
formatDate
{{formatDate iso}}
17 May 2026
formatNumber
{{formatNumber qty 0}}
1,235
uppercase
{{uppercase name}}
ACME LTD
lowercase
{{lowercase name}}
acme ltd
default
{{default reference "N/A"}}
Fallback if value is falsy
percent
{{percent rate 1}}
12.3%
Arithmetic
Helper
Example
Output
add
{{add subtotal tax}}
Sum of two numbers
subtract
{{subtract total discount}}
Difference of two numbers
multiply
{{multiply qty price}}
Product of two numbers
divide
{{divide total count}}
Quotient of two numbers
Comparison (use inside {{#if}})
Helper
Example
Meaning
eq
{{#if (eq status "paid")}}
Strict equality
neq
{{#if (neq type "draft")}}
Not equal
gt
{{#if (gt total 0)}}
Greater than
gte
{{#if (gte qty 10)}}
Greater than or equal
lt
{{#if (lt qty 10)}}
Less than
lte
{{#if (lte balance 0)}}
Less than or equal
AI agents can call list_template_helpers via MCP to get this list along with runnable examples — no need to hard-code it into prompts.
