Is there a JavaScript or TypeScript SDK?

There is no official JavaScript/TypeScript SDK yet. However, the REST API is straightforward to use with fetch or any HTTP client:

const response = await fetch(
  "https://api.matcraft.ai/api/v1/materials?search=Si&per_page=10"
);
const { data, meta } = await response.json();

for (const material of data) {
  console.log(`${material.formula}: Eg = ${material.band_gap} eV`);
}

The API returns standard JSON responses, so any language with HTTP support can integrate with MatCraft. A TypeScript SDK is on our roadmap based on community demand.