J.League Surpasses 12 Million Annual Visitors with Fan Marketing Backed by LINE Mini App Development and Authentication Infrastructure
Japan Professional Football League (J.League)
Applied Services: LINE Mini App, Barista Authentication, AWS Infrastructure, Games & Entertainment
Date Published: 12 MAY 2025
The Japan Professional Football League (J.League) experienced sharp attendance declines during COVID-19 restrictions, then launched an ambitious digital marketing recovery strategy. Starting with the J.League ID system in 2017, the organization built a progressive digital fan engagement platform — culminating in a record-breaking 12 million annual attendees in the 2024 season. Central to this achievement was a LINE Mini App and Barista authentication infrastructure, both developed with Classmethod.
The Challenge: Attracting Casual Fans at Scale
The J.League's existing digital strategy was effective for engaging loyal supporters, but struggled to attract casual fans who had never attended a match. Additionally, with 60+ club teams each needing independent development capabilities while sharing a common authentication infrastructure, the technical architecture needed to balance flexibility with consistency.
Digital Marketing Timeline
Barista: Centralized Authentication for 60+ Services
The Barista authentication platform, built by Prismatics (a Classmethod subsidiary), provides OAuth 2.0/OpenID Connect 1.0-compliant centralized membership ID authentication. It currently integrates 60+ services via API, enabling each club to develop customized features while sharing a secure, common authentication layer.
"Because OAuth 2.0/OpenID Connect 1.0 are standard specifications, explaining implementation to each club went smoothly."
— Mr. Nomizo, J.League
The LINE Mini App: Five Functions for Fan Engagement
Launched in October 2022, the J.League LINE Mini App targets casual fans who have never attended a stadium. It has been adopted by approximately 70% of the 60 clubs and features:
Fan Club Card Display
Digital membership cards accessible directly in LINE
QR Ticket Display
GPS-enabled stadium entry with digital ticket presentation
Instant Lottery Campaigns
Engagement campaigns with GPS-gated rewards and digital content
Friend Referral Feature
Free ticket coupons to lower trial barriers for new fans
Favorite Player Videos
Highlight reels and match digests for up to 9 favorite players
Why J.League Selected Classmethod
"I knew Classmethod had strong app development experience including LINE. I had worked with them previously, and what impressed me was their sincere desire to deeply understand the issues behind needing the app."
— Mr. Nomizo, J.League
"Engineers at Classmethod were easy to talk to, and I genuinely enjoyed the development period. They gave accurate, helpful responses when explaining background and issues we faced."
— Mr. Ichiyanagi, J.League
Record-Breaking Results
Results Achieved
- • 2.38 million friend registrations across all clubs
- • 100,000+ monthly active users (J.League ID members)
- • 70% adoption rate among 60 clubs
- • 12 million annual attendees achieved in 2024 season — a record
- • Favorite player video feature developed in just 3 months (August–October 2024)
Future Plans
The J.League plans to expand J.League ID integration, enable one-on-one user communication through LINE beyond traditional CRM, grow video content including behind-the-scenes player footage, and potentially apply the platform model to other sports beyond football.
This case study uses LINE Mini App Development and Barista Authentication.
Classmethod develops LINE Mini Apps and authentication platforms for sports organizations, retail chains, and entertainment venues — enabling fan engagement, loyalty programs, and digital ticketing at scale.