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Version: 1.23.0

Platformatic Runtime

Platformatic Runtime is an environment for running multiple Platformatic microservices as a single monolithic deployment unit.



If you run into a bug or have a suggestion for improvement, please raise an issue on GitHub.

Standalone usage

If you're only interested in the features available in Platformatic Runtime, you can replace platformatic with @platformatic/runtime in the dependencies of your package.json, so that you'll import fewer deps.

Example configuration file

The following configuration file can be used to start a new Platformatic Runtime project. For more details on the configuration file, see the configuration documentation.

"$schema": "",
"autoload": {
"path": "./packages",
"exclude": ["docs"]
"entrypoint": "entrypointApp"

TypeScript Compilation

Platformatic Runtime streamlines the compilation of all services built on TypeScript with the command plt runtime compile. The TypeScript compiler (tsc) is required to be installed separately.

Platformatic Runtime context

Every Platformatic Runtime application can be run as a standalone application or as a Platformatic Runtime service. In a second case, you can use Platformatic Runtime features to archive some compile and runtime optimizations. For example, see Interservice communication. Looking through the Platformatic documentation, you can find some features that are available only if you run your application as a Platformatic Runtime service.

Interservice communication

The Platformatic Runtime allows multiple microservice applications to run within a single process. Only the entrypoint binds to an operating system port and can be reached from outside of the runtime.

Within the runtime, all interservice communication happens by injecting HTTP requests into the running servers, without binding them to ports. This injection is handled by fastify-undici-dispatcher.

Each microservice is assigned an internal domain name based on its unique ID. For example, a microservice with the ID awesome is given the internal domain of http://awesome.plt.local. The fastify-undici-dispatcher module maps that domain to the Fastify server running the awesome microservice. Any Node.js APIs based on Undici, such as fetch(), will then automatically route requests addressed to awesome.plt.local to the corresponding Fastify server.


For each service in the runtime except the entrypoint, Platformatic will set the Fastify's trustProxy option to true. This will change the ip/hostname in the request object to match the one coming from the entrypoint, rather than the internal xyz.plt.local name. Visit fastify docs for more details