Triplate (TypeScript)

A templating engine for RDF query & data languages (SPARQL, Turtle, …) with a typed --- frontmatter header, injection-safe values, loops and conditionals. TypeScript reference implementation of the Triplate language.

import { compile } from 'triplate';

const tmpl = compile(`
---
params {
  classes: iri[] min 1
  limit:   int optional
}
---
SELECT ?s WHERE {
{% for c in classes join "UNION" %}
  { ?s a ${c} }
{% endfor %}
}
{% if limit %}LIMIT ${limit}{% endif %}
`);

tmpl.render({ classes: ['http://example.org/Person'], limit: 10 });

Every input is declared in the mandatory --- frontmatter header with its RDF type, cardinality and optionality; the context is validated and each value escaped accordingly, so rendered output is injection-safe and an unprocessed template fails fast.

See triplate.dev for the full guide and specification.