Is there an Official DDP client library

I am wondering If possible/how to connect to Meteor from a non meteor app. maybe through DDP ?

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Yes, it is possible to talk to any Meteor server from anywhere, as long as you can open a websocket. You just need to follow the DDP protocol.

As an example, take a look at my unity3d-ddp-client project.

Never used, but Asteroid is a NPM package that lets you connect and subscribe to an external Meteor backend elegantly through DDP:

import {createClass} from "asteroid";

const Asteroid = createClass();
// Connect to a Meteor backend
const asteroid = new Asteroid({
    endpoint: "ws://localhost:3000/websocket"
});

// Use real-time collections
asteroid.subscribe("tasksPublication");

asteroid.ddp.on("added", ({collection, id, fields}) => {
    console.log(`Element added to collection ${collection}`);
    console.log(id);
    console.log(fields);
});

// Login
asteroid.loginWithPassword({username, email, password});

// Call method and use promises
asteroid.call("newUser")
    .then(result => {
        console.log("Success");
        console.log(result);
    })
    .catch(error => {
        console.log("Error");
        console.error(error);
    });

This list may be a little out-of-date, but could be worth a look:

http://meteorpedia.com/read/DDP_Clients

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Here’s an example Node.js command-line utility using the ddp package from npm (one of the many options listed on the excellent meteorpedia page @robfallows linked to)

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