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What is Chai?

Q: What is Chai?

Short answer: Chai is an assertion library for Node.js that lets you write readable tests with different styles: Expect style (most popular): expect(result).to.equal(5); Should style: result.should.equal(5); Assert style: assert.equal(result, 5); Real-world example (ShopNest) A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: Chai is an assertion library for Node.js that lets you write readable tests with different styles: Expect style (most popular): expect(result).to.equal(5); Should style: result.should.equal(5); Assert style: assert.equal(result, 5);

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

Say this in the interview

Define — one clear sentence (the short answer above).
Example — relate it to a project like ShopNest or your real work.
Trade-off — when you would not use it.

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