Haneda airport guide
Haneda is closer to central Tokyo than Narita, but the JR Pass works slightly differently here. Here is how to exchange your voucher and which trains are covered.
Haneda has a JR East Travel Service Center inside Terminal 3 (international) where you exchange the voucher you received from GetJRPass for the actual pass. Bring your passport.
If speed matters, take the Keikyu line from Haneda to Shinagawa, then switch to JR. If you prefer to use the pass right away, exchange at Terminal 3 and ride covered JR services from there.
Quick answers to common questions.
No. The Tokyo Monorail is operated separately and needs a separate ticket or IC card.
The main JR exchange counter at Haneda is in Terminal 3. Take the free shuttle between terminals.
Narita Express is fully covered by the pass. From Haneda the easiest covered route uses Keikyu plus JR, so Narita is slightly more pass friendly.
Keep exploring Japan Rail Pass topics relevant to your trip.