Edge Functions Examples / WebAssembly


Using WebAssembly, you can speed up key components of your server logic. Using Netlify Edge Functions, you can bring that to the edge. This allows developers to build more calculation intensive logic in languages such as C, C++, and Rust that gets pushed even closer to users.

In this example, we return a wasm computed response The answer is: 42.

// inlined Rust compiled code that prints "42"
const wasmCode = new Uint8Array([

const wasmModule = new WebAssembly.Module(wasmCode);
const wasmInstance = new WebAssembly.Instance(wasmModule);
const main = wasmInstance.exports.main as CallableFunction;

export default async () => {
  return new Response(`The answer is: ${main().toString()}`);

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What are Edge Functions?

Using JavaScript and TypeScript, Netlify Edge Functions give you the power to modify network requests to localize content, serve relevant ads, authenticate visitors, A/B test content, and much more! And this all happens at the Edge — directly from the worldwide location closest to each user.

To use Edge Functions on Netlify, add JavaScript or TypeScript files to an edge-functions directory in your project, and add [[edge_functions]] entries to your netlify.toml file.

Learn more in the docs.

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