Clear DefinitionsdApp Backend
1 min read
Pronunciation
[dee-app bak-end]
Analogy
Like the kitchen in a restaurant where all the cooking and plating happens before dishes go out to customers.
Definition
The server‑side components and smart contracts that implement business logic, data persistence, and integration with blockchain networks for a decentralized application.
Key Points Intro
dApp backends power on‑chain interactions and off‑chain services behind the scenes.
Key Points
Smart contracts: On‑chain code handling core logic and state.
APIs and middleware: Off‑chain services querying nodes and relaying transactions.
Database: Stores user profiles, indexing blockchain data.
Job schedulers: Trigger automated tasks like oracle updates or liquidations.
Example
A lending dApp backend runs a Node.js service that listens for `LoanCreated` events, updates a Postgres database, and notifies frontend clients via WebSocket.
Technical Deep Dive
Backend uses web3.js or ethers.js to subscribe to contract events. Express.js APIs serve frontend requests. A Redis queue manages job processing for scheduled repayments. Smart contracts deployed via Hardhat.
Security Warning
Exposed APIs can be abused; implement rate limiting, authentication, and input validation.
Caveat
Off‑chain components introduce trust assumptions; critical logic should remain on‑chain when possible.
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