deno-port

Get an available TCP port for your Deno server

Basic Usage

  import { serve } from "https://deno.land/std/http/server.ts";
  import { getPort, portRange, portSelection } from "https://deno.land/x/port/mod.ts";

  const s = serve({ port: portSelection([3011, 8080], { log: true }) });
  for await (const req of s) {
    req.respond({ body: "Response from server\n" });
  }

The module works with different frameworks of Deno. You can check an example with OAK in the examples/ folder. It is inspired by get-port, find-free-port or other related packages for nodejs.

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API

getPort()

getPort(port?: number, options?: { log?: boolean }): number

If port was specified it returns that port, if it was not, it returns a random port assigned from the Operating System.

Optional parameters:

1. { port?: number }
2. { log?: boolean }

Example usage:

getPort(3000, { log: true }); 

getPort(3000); // by default log is false

portSelection([1024, 1025, ..., n])

portSelection(ports: Array<number>, options?: { log?: boolean}): number

Returns a port from the specified selection of ports in the ports array.

Required parameters:

1. ports: Array<numbers>

Optional parameters:

1. { log?: boolean }
   

Example usage:

portSelection([8080, 3001], { log: true }); 

portSelection([3000, 3011]); // by default log is false

portRange(min_port, max_port)

portRange(min_port: number, max_port: number, options?: { log?: boolean}): number

Returns a port in between min_port and max_port.

Required parameters:

1. min_port: number
   
2. max_port: number
   

Optional parameters:

1. { log?: boolean }

Example usage:

portRange(3001, 8080, { log: true }); 

portRange(3000, 3011); // by default log is false

Other

There are no race conditions when the ports are assigned.