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Zig developer Lukáš Lalinský has introduced zt, a library that adapts the Templ approach to HTML templating in Zig. Its templates are transpiled into Zig during the build, so type errors surface as compiler errors, while dynamic values are escaped by default. The report does not provide independent benchmarks or details about the library’s release maturity.
Zig developer Lukáš Lalinský has introduced zt, a library for writing HTML templates that are transpiled into Zig code during the build. The approach lets Zig’s compiler check template inputs and reports template mistakes as compile errors, while the library escapes dynamic values by default to reduce common cross-site scripting risks.
Lalinský describes zt as an adaptation of Templ for Go. Templates are parsed and converted to Zig code during zig build, allowing templates to import application code and application code to import templates. As a result, template parameters can use Zig types, and callers must supply values of the expected types.
The generated code writes HTML to a std.Io.Writer. Lalinský says applications can write directly to a socket or collect the output in a buffer. The library’s example uses a typed user value to render a welcome page, with separate markup for signed-in and guest users; templates can also define layouts and insert child templates.
According to Lalinský, dynamic values are HTML-escaped by default in text and attributes. URL attributes such as href and src are checked for dangerous schemes. Raw HTML requires an explicit {!value} form, and the parser requires elements to be closed. He cautions that these safeguards do not prevent every security problem.
Compile-Time Checks for HTML
With zt, a typo in a field referenced by a template can become a Zig compiler error rather than a failure discovered only when a particular page is rendered. Lalinský’s example shows an invalid field name reported against generated Zig code, with a comment pointing to the corresponding location in the template. The same type checking applies when application code calls a template with an argument of the wrong type.
That shifts some template validation into the normal build process. For teams using Zig for server-side applications, it could make HTML templates easier to check alongside the rest of the program and reduce reliance on runtime testing for basic type mistakes. Default escaping also offers a safer starting point for handling user-provided values, although it is not a replacement for broader security review.
The design also reflects Lalinský’s performance goals: he says generated templates write directly to a writer, with no intermediate state or allocations in the template code. Those are design claims in his report; it includes no independent performance measurements or comparison with other template engines.
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From Zig Backends to HTML
Lalinský says he began considering web development in Zig after building zio and Dusty, projects he describes as part of his ecosystem for API backends. He says arena allocators made the memory management involved in web development more manageable, while Zig’s compile-time features offered a way to build higher-level interfaces.
He wanted a template system that checked inputs at compile time, wrote output directly, escaped values by default and retained an HTML-like syntax. After looking at Ziex, whose JSX-inspired approach gave him ideas, and Templ for Go, he developed zt for his needs. He says Ziex did not directly fit because he did not want a WebAssembly framework.
Lalinský also points to htmx and Datastar as ways to build interactive web applications without writing JavaScript or TypeScript. That is part of his motivation for returning to frontend work, rather than a feature or compatibility claim about zt itself.
“It has to be type-safe, with all inputs typed and checked at compile time.”
— Lukáš Lalinský, zt’s author
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Adoption and Security Limits
Lalinský’s report presents zt and its design, but does not state its release status, version, license, or compatibility range. It also gives no adoption figures, external evaluation or independent security audit. Readers cannot yet use the report alone to judge how stable the library is for production use.
The described escaping and URL-scheme checks address common risks, but the author explicitly says they do not cover everything. The report does not set out a full threat model or detail the boundaries of the checks. Performance is likewise unquantified: the code-generation design is described, but no measured comparison is supplied.
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Build and Project Details
The next practical step for interested Zig developers is to review zt’s source and build instructions, then test it with their own templates and application types. Lalinský’s report says templates are generated during zig build, but does not specify a supported Zig version or a release roadmap, so those details need confirmation from the project itself.
Lalinský also flags a separate issue in his example involving error handling and std.Io cancellation. He says he may write a post about it and points readers to a Ziggit discussion; the report does not establish a publication date for that follow-up. Further documentation, benchmarks and security review would help developers assess the library’s suitability beyond the examples provided.
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Key Questions
What is zt?
zt is a Zig HTML templating library introduced by Lukáš Lalinský. It converts templates into Zig code during the build so they can be imported and checked by the compiler.
How does zt catch template mistakes?
Because templates use application types, invalid field names and incorrect argument types can produce Zig compile errors. Lalinský says generated-code comments link errors back to their locations in the original template.
Does zt prevent cross-site scripting?
No complete protection is claimed. Lalinský says dynamic values are escaped by default and URL attributes are checked for dangerous schemes, but warns that these measures do not prevent every security problem. Raw HTML must be requested explicitly.
How does zt produce rendered HTML?
Its generated code writes to a std.Io.Writer. Lalinský says applications can direct output to a socket or accumulate it in a buffer.
Are zt’s performance and release status established?
The report describes a direct-write design but gives no benchmarks. It also does not specify a version, license, Zig compatibility range or release maturity, so those points remain unconfirmed in the source material.
Source: hn
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