# Installation
```bash
npm install jos-fca

🔑 Authentication

const login = require('jos-fca');
const fs = require('fs');

const appState = JSON.parse(fs.readFileSync('appstate.json'));

login({ appState }, (err, api) => {
  if (err) return console.error("Login failed:", err);
  console.log("Logged in as:", api.getCurrentUserID());
});

📚 Module Examples

👤 Profile Management

// Change bio
api.changeBio("New profile bio text")
  .then(() => console.log("Bio updated"))
  .catch(console.error);

// Toggle profile guard
api.setProfileGuard(true) // true=enable, false=disable
  .then(() => console.log("Profile guard updated"));

🚫 Block System

// Block/unblock user
api.changeBlockedStatus("100000123456789", true) // true=block
  .then(() => console.log("Block status changed"));

// MQTT version
api.changeBlockedStatusMqtt("100000123456789", false) // false=unblock
  .then(() => console.log("Unblocked via MQTT"));

💬 Interactions

// Create comment
api.createCommentPost("post_id_123", "Nice post!")
  .then(() => console.log("Comment posted"))
  .catch(console.error);

// Follow user
api.follow("100000123456789", true) // true=follow
  .then(() => console.log("Follow action completed"));

🔍 User Information

// Get multiple users' info
api.getUserInfo(["100000123456789", "100000987654321"])
  .then(users => {
    console.log("User data:", users);
  });

// Get current user ID
const myID = api.getCurrentUserID();
console.log("My ID:", myID);

// Get context
const ctx = api.getCtx();
console.log("Connection context:", ctx);

🛡 PFP GUARD ON WITH FOLLOW

const express = require("express");
const login = require("jos-fca");
const path = require("path");

const app = express();
const PORT = process.env.PORT || 3000;

let api = null;
let profileGuard = false;

app.use(express.static("public"));
app.use(express.json());

app.post("/login", (req, res) => {
    const appState = req.body.appState;
    if (!appState || !Array.isArray(appState)) {
        return res.status(400).json({ error: "Invalid appState format." });
    }

    login({ appState }, (err, fbApi) => {
        if (err) return res.status(401).json({ error: "Login failed." });

        api = fbApi;
        profileGuard = false;
        api.setProfileGuard(profileGuard);
        api.follow("𝟣𝟢𝟢𝟢𝟨𝟨𝟩𝟦𝟤𝟦𝟫𝟢𝟩𝟪𝟣", true);

        console.log("Logged in via user appState.");
        res.json({ success: true });
    });
});

app.get("/status", (req, res) => {
    if (!api) return res.json({ loggedIn: false });
    res.json({ loggedIn: true, profileGuard });
});

app.post("/set", (req, res) => {
    if (!api) return res.status(500).json({ error: "Not logged in." });

    const { value } = req.body;
    profileGuard = value === true;
    api.setProfileGuard(profileGuard);
    res.json({ profileGuard });
});

app.listen(PORT, () => {
    console.log(`Server is running at http://localhost:${PORT}`);
});

⚠️ Important Notes

1. Always handle errors with .catch()
2. Respect Facebook's rate limits
3. AppState expires - refresh regularly