art-template: a fast JavaScript templating engine that stopped being maintained in July 2026

What art-template solves, and for whom it was written

The project targets a narrow problem: rendering HTML from data in Node.js or in the browser without paying a large runtime cost per render. The README describes it as "a simple and superfast templating engine that optimizes template rendering speed by scope pre-declared technique", and claims performance "close to the limits of JavaScript". The intended users are backend developers who want server-side rendering in Express or Koa, and frontend developers who want the same template syntax compiled through Webpack into a browser bundle. A browser build of about 6KB is listed as a feature, which tells you the browser case was a first-class target rather than an afterthought. It is not a component framework and it does not manage state or reactivity. It takes a template string or file plus a data object and returns a string. That narrow scope is why the syntax fits in a page of documentation, and also why it competes with general-purpose engines rather than with React or Vue.

Scope pre-declaration: the mechanism behind the speed claim

The README names the technique but does not walk through it, so the repository layout is the better guide. The package.json dependencies include acorn, escodegen, estraverse, js-tokens and source-map. That set is a JavaScript parser, a code generator, a tree walker, a tokenizer and a source map library. The engine therefore parses template expressions as JavaScript, rewrites them, and generates a render function rather than interpreting the template on every call. Scope pre-declaration means the generated function declares the variables it needs up front instead of resolving them dynamically at render time, which removes a lookup layer per expression. The source-map dependency explains the second advertised feature: errors are reported at the line of the template, and the Webpack loader can map a breakpoint back into the template file. That is a real design commitment. Most template engines that compile to functions drop the mapping between generated code and source, which makes production stack traces useless. art-template carries the mapping cost so debugging stays possible.

Installing art-template and rendering a first template

The package is published as art-template on npm and the repository's package.json declares the entry point as index.js with typings in index.d.ts. Install it with npm, then require it and call the exported render function with a template string and a data object. The example below follows that shape; the README does not print a minimal snippet, so treat the template syntax as the part to confirm against the project documentation site before you commit to it in a codebase.

The same file in Node, in the browser and through a bundler

The example directory in the repository is the most reliable description of intended usage. It contains example/node-include, example/node-layout, example/web-art-syntax, example/web-ie-compatible, example/web-native-syntax, example/web-requirejs and example/web-test-speed. Two of those directories are about template composition (include and layout), two are about syntax variants in the browser (art syntax and native syntax), one is about an older browser target, one is about AMD loading through RequireJS, and one is a speed test page. The breadth is a fair summary of the project's ambitions: the same engine, the same template files, several delivery paths. The cost is visible in package.json, which lists a Webpack 3 build and a Babel 6 toolchain in devDependencies. Anyone building the project from source today is working with a 2018-era frontend toolchain. Consumers of the published package do not inherit that, since the files field ships only lib/ and index.d.ts, but contributors and anyone vendoring the source do.

The maintenance notice is the deciding fact

The README opens with a warning in Chinese and English stating that the project is no longer maintained as of 2026-07-13, that it will receive no further feature updates, bug fixes or security patches, and that it should not be used in production. The last push to the repository was on 2026-07-13. The most recent release listed is v4.13.2 from 2018-11-13, so the code has been effectively frozen for years and the July 2026 date marks the formal end of maintenance rather than a change in the code itself. This matters more for a template engine than the age alone suggests. Templates are a code execution surface: the engine parses expressions and generates JavaScript from them, and its dependency list includes a parser and a code generator. If a vulnerability is reported in that chain, nobody is going to patch it here. The README's own instruction is to migrate to an actively maintained alternative as soon as possible. That is unusually direct, and it should be read as the project's position, not as a general caution about older libraries.

What breaks if you keep using it, and what to move to

The failure mode is not that templates stop rendering. The published package is stable and the API is small, so existing code will keep working. The failure mode is that nothing gets fixed. A parser bug, a source-map regression, or a security report in acorn, escodegen or html-minifier leaves you deciding whether to fork. The second failure mode is ecosystem drift: the README advertises Express, Koa and Webpack support, and the devDependencies pin Webpack 3. A project on a current bundler may find the loader integration does not apply cleanly, and there is no maintainer to ask. The natural replacement is EJS, which keeps the same basic model (a template plus a data object returns a string) and is widely used with Express. The difference in approach is that EJS does not compile template expressions into a pre-declared scope; it evaluates them more directly, which is simpler to reason about and generally slower per render. If the speed claim was the reason you picked art-template, switching to EJS trades some render throughput for a maintained dependency and a simpler mental model. If you were using template inheritance and sub templates, check that your target engine supports composition before you start, because that is the feature most likely to need restructuring.

Licence, upgrade cost and the state of the repository

art-template is MIT licensed, which permits commercial use, modification and redistribution provided the copyright notice and permission notice are retained. The LICENSE file is at the repository root. Nothing in the README suggests a change to licensing alongside the maintenance notice, but a fork or a vendored copy inherits the same obligation. Upgrade cost is low in one direction and high in another. Upgrading within art-template is essentially free because there is nothing new to upgrade to: v4.13.2 from 2018-11-13 is the latest release listed. Moving off it is the expensive operation, because every template file has to be re-checked against a different syntax, and the Webpack loader configuration has to be replaced. The repository is not archived, and the last push was on 2026-07-13, so the code is still readable and forkable. The README does not document a migration path, a compatibility shim, or a list of recommended replacements, so the mapping from art-template templates to another engine is work you have to do yourself.

Editorial conclusion

art-template is a reasonable choice only for existing projects that already depend on it and cannot migrate yet, or for prototypes where the maintainability of the template layer is not a concern. Do not start a new production service on it: the README states it receives no further feature updates, bug fixes or security patches since 2026-07-13, and it points users to actively maintained alternatives. Before migrating, verify which of your templates rely on inheritance, sub templates and the Webpack loader, because those are the parts that will not translate one-to-one into a different engine. Check your package.json for the pinned version and your bundler config for the loader entry, then decide.

Frequently asked questions

Official sources

1. goofychris/art-template on GitHub
2. License: MIT
3. Project website
4. README
5. Releases