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abgne/line-dev

line-liff

Comprehensive reference for LINE Front-end Framework (LIFF) SDK — building web apps inside LINE with authentication, messaging, QR scanning, permanent links, pluggable SDK, and LIFF plugin development.

View source

How to use

  1. Copy the installation command and review the source package before installing it in your own agent environment.
  2. Check the source document for required tools, credentials and supported hosts.
  3. Describe your input and desired deliverable; review the output against the source material.
npx skills add https://github.com/abgne/line-dev --skill line-liff

Before you start

  • Installation does not include a model subscription, API allowance or permission to access your files.
  • Repository stars and installation counts describe activity, not an independent quality or security test.
Original skill document

Rendered from the source repository. Headings, examples, code, tables, links, and referenced images are preserved.

LINE LIFF (Front-end Framework)

Do not answer LIFF questions from memory — LINE updates APIs frequently and training data is unreliable. Always consult the references below.

Reference for building, reviewing, and debugging LIFF web apps inside LINE.

Workflow

Build

  1. Read references/guidelines.md (registration, endpoint URL rules, environment compatibility)
  2. Load the relevant reference for the feature being implemented
  3. For architecture or design choices, consult references/experts.md for directional guidance
  4. Write code following specs and constraints from references

Review / Debug

  1. Read references/guidelines.md (URL constraints, authentication flow, API availability)
  2. Load relevant references for the code being reviewed
  3. Cross-check code against specs (endpoint URL rules, scope requirements, environment limitations, init order)
  4. For design pattern concerns, consult references/experts.md
  5. Report violations with reference to specific constraints

Environment Variables

LIFF_ID=LIFF app ID (from LINE Developers Console)
LINE_LOGIN_CHANNEL_ID=LINE Login Channel ID (for server-side JWT verification)
LINE_LOGIN_CHANNEL_SECRET=Channel secret (server-side only)
CHANNEL_ACCESS_TOKEN=Channel access token (for LIFF Server API — manage LIFF apps programmatically)

SDK

Install via CDN or npm. For tree-shaking (reduce ~34% bundle size), use pluggable SDK.

SDK installation, CDN/npm setup, pluggable SDK → [references/api.md § Pluggable SDK](references/api.md)

Initialization

javascript
liff.init({ liffId: 'YOUR_LIFF_ID', withLoginOnExternalBrowser: true })
  .then(() => { /* use LIFF APIs */ })
  .catch(err => console.error(err.code, err.message));
  • Must be called before all LIFF APIs (except pre-init methods)
  • withLoginOnExternalBrowser: true — auto-trigger login in external browser
  • liff.ready — Promise that resolves when init completes

Getting Started

  1. Create a LINE Login channel in LINE Developers Console
  2. Add a LIFF app and set the Endpoint URL (HTTPS required)
  3. Integrate SDK, call liff.init()
  4. Or scaffold with npx @line/create-liff-app (React/Vue/Svelte/Next.js/Nuxt/vanilla)

API Reference

Complete API reference (methods, parameters, scopes, availability matrix) → [references/api.md](references/api.md)

View Sizes

TypeCoverage
Full100% screen
Tall~75%
Compact~50%

Key Constraints

  • Endpoint URL: liff.init() only works at or below the registered Endpoint URL
  • URL handling: modify URLs only after liff.init() resolves
  • Universal Links: use https://liff.line.me/{liffId} as primary entry point
  • Token security: send raw ID Token to server for verification, never expose decoded token → see server-auth.md
  • Login behavior differs: auto in LIFF browser, manual in external browser
  • Deprecated APIs: liff.scanCode() → use scanCodeV2(); liff.getLanguage() → use getAppLanguage(); liff.permanentLink.createUrl() → use createUrlBy() (may be removed in v3)

Reference Index

FileTopic
references/api.mdLIFF v2 API complete reference, pluggable SDK modules, error codes
references/guidelines.mdRegistration, endpoint URL rules, authentication flow, UI/UX, environment compatibility
references/navigation.mdLIFF URLs, liff.state, permanent links, LIFF-to-LIFF transitions, browser minimization
references/plugins.mdLIFF plugin development, hooks system, official plugins (Inspector, Mock)
references/server-api.mdLIFF Server API (v1) — programmatic LIFF app CRUD (create, update, list, delete)
references/server-auth.mdServer-side ID Token (JWT) verification
references/cli.mdLIFF CLI — local HTTPS dev server, app CRUD, Inspector debugging, ngrok
references/experts.mdLIFF domain experts for architecture guidance

SDK & Tools