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Integration · medium

48. Frontend integration

Wiring a contract to a dApp.

1 min read3 questionsup to 50 XPtopic 48/50

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A front-end needs the ABI, the address and a signer. Reads go through a provider; writes need a wallet signature and should surface the pending state and the final receipt.

javascript
const c = new ethers.Contract(address, abi, signer);
const tx = await c.stake(amount);
const receipt = await tx.wait();

Check the chain id before every write, decode custom errors for readable messages, and never trust client-side validation as security.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
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Check your understanding

  1. 1. What three things does a dApp need?

  2. 2. What does `tx.wait()` return?

  3. 3. Why check the chain id first?

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