dt-js-runtime

# Dynatrace JavaScript Runtime The Dynatrace JS runtime is a server-side AppEngine sandbox that executes JavaScript/TypeScript. ## Function contract Every entry point must export a default async function: ```js export default async function () { // ... return result; } ``` ES module syntax required. TypeScript accepted (type annotations, interfaces, generics). No other export shape is supported. ## References Start here, then load only the file you need. | File | When to load | |------|-------------| | [references/limits-and-restrictions.md](references/limits-and-restrictions.md) | Timeout / memory / I/O quotas; what's forbidden (`eval`, WebSocket, sockets, filesystem) | | [references/apis-and-modules.md](references/apis-and-modules.md) | Which Web APIs and Node.js compat modules are available (fetch, crypto, streams, buffer, …) | | [references/fetch.md](references/fetch.md) | Calling internal `/platform/...` APIs or external URLs, credential vault, outbound allowlist | | [references/sdk.md](references/sdk.md) | Any `@dynatrace-sdk/*` package — the index routes you to the right per-SDK file | ## Running a function with dtctl Use `dtctl exec function` to run JS runtime code without deploying an app. ```dtctl # Run inline code dtctl exec function --code 'export default async function() { return "hello" }' # Run from file dtctl exec function -f script.js # Pass JSON input — accessed as event.payload inside the function dtctl exec function -f script.js --payload ...