# Testing and debugging > Run JavaScript functions locally, call them over HTTP, execute one as a job, and validate the packaged project before publishing. Functions run locally before they are packaged, against the same runtime and the same routing the platform uses. ## Serve and call ```bash uip function serve ``` Starts a hot-reload server on port 7070; `--port` changes it. Every HTTP function is callable at its declared path, and the root URL lists the registered routes. Call a served function with `curl` at its declared path: ```bash curl -X POST http://localhost:7070/hello \ -H "Content-Type: application/json" \ -d '{"name":"Alice"}' ``` `serve` also takes `--runtime` to choose the runtime, `node` or `deno`. ## Run one as a job ```bash uip function run --function process-order --input '{"orderId":"A-1"}' ``` `run` executes the function once the way the platform runs a job, then prints a `JobResult` carrying the status and the output arguments. It does not need `serve` and makes no HTTP request, so `ctx.params` and `ctx.headers` are empty — the same conditions a deployed job function sees. Use it to test a function that declares no `method` and `path`. Pass `--entrypoint` instead of `--function` to point at a file directly. One of the two is required. ## Reaching Orchestrator locally `ctx.robot` is `null` in a local run, and `ctx.platform` is built from environment variables. Put them in a `.env` file at the project root: ``` UIPATH_ACCESS_TOKEN= UIPATH_BASE_URL=https://cloud.uipath.com UIPATH_ORG_ID= UIPATH_TENANT_ID= ``` `serve` loads that file automatically on both supported runtimes. Exporting the variables in your shell works too. ## Validating the packaged project `serve --production` and `run --production` reproduce a platform cold start: no hot reload, and the installed server runner is reused rather than rebuilt. Running the packed output this way surfaces the failures the platform would hit on deployment — most often a runtime dependency that was left in `devDependencies`. See the [CLI reference](https://uipath.github.io/uipath-typescript/js-functions/cli-reference/) for the full recipe. ## Next steps - [Packaging and publishing](packaging-and-publishing.md) - [Invoking functions](invoking-functions.md)