recently worked on a node js project which requires to login via Linkedin API and then use access token generated via login to access profile, company pages data. here are the steps i followed to make it work.
Create App on LinkedIn
go to Developers page and create an app.
after creating an app, go to app Auth settings, copy client id and client secret.
add Redirect URL.
Login using Linkedin OAuth2
install Passport
npm install passport --save
install Passport Linkedin Strategy
npm install passport-linkedin-oauth2
in your index.js (or main file)
index.js
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// paspport dependencies
var passport = require('passport');
var LinkedInStrategy = require('passport-linkedin-oauth2').Strategy;
// linkedin app settings
var LINKEDIN_CLIENT_ID = "CLIENT_ID_HERE";
var LINKEDIN_CLIENT_SECRET = "CLIENT_SECRET_HERE";
var Linkedin = require('node-linkedin')(LINKEDIN_CLIENT_ID, LINKEDIN_CLIENT_SECRET);
passport.serializeUser(function (user, done) {
done(null, user);
});
passport.deserializeUser(function (obj, done) {
done(null, obj);
});
passport.use(new LinkedInStrategy({
clientID: LINKEDIN_CLIENT_ID,
clientSecret: LINKEDIN_CLIENT_SECRET,
callbackURL: "http://127.0.0.1:3000/auth/linkedin/callback",
scope: ['r_emailaddress', 'r_basicprofile', 'rw_company_admin'],
passReqToCallback: true
},
function (req, accessToken, refreshToken, profile, done) {
req.session.accessToken = accessToken;
process.nextTick(function () {
return done(null, profile);
});
}));
// for auth
app.get('/auth/linkedin',
passport.authenticate('linkedin', { state: 'SOME STATE' }),
function(req, res){
// The request will be redirected to LinkedIn for authentication, so this
// function will not be called.
});
// for callback
app.get('/auth/linkedin/callback', passport.authenticate('linkedin', { failureRedirect: '/' }),
function (req, res) {
res.redirect('/');
});
now you have access token saved in req.session.accesstoken variable.
Using Access Token to make REST API Calls for data
install node-linkedin package from npm
npm install node-linkedin --save
get all company pages (where logged in user is admin)
index.js
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app.get('/companies', function (req, res) {
var user_companies = null;
if (req.session.accessToken != undefined) {
var linkedin = Linkedin.init(req.session.accessToken);
linkedin.companies.asAdmin(function (err, companies) {
this.user_companies = companies;
res.json(this.user_companies);
// now use this data in view
// e.g.
// res.render('index', { companies: user_companies });
});
}
else
{
res.render('index', { companies: user_companies });
}
});
get company info by id
index.js
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app.get('/company/:id', function(req,res){
if (req.session.accessToken != undefined) {
var linkedin = Linkedin.init(req.session.accessToken);
linkedin.companies.company(req.params.id, function (err, company) {
res.json(company);
// res.render('company', { company: company });
});
}
else
{
res.send('not found');
}
})
i hope this helps you in creating an linked in app and using it to access data via REST API calls.
let me know in the comments if you need some help.
Vijayant Katyal
👋, I am a full stack web developer from india
