Every GraphQL query you send travels over HTTP. Every response comes back the same way. But here's the thing: HTTP was designed for fetching documents, not executing queries. GraphQL essentially hijacked a delivery truck and turned it into a taxi service. Let's explore the protocol that makes it all possible.
Every time you fire a GraphQL query, your beautifully crafted response comes back wrapped in JSON. But how well do you actually know JSON? Not "I can read it" know, I am talking about "I know exactly where the spec draws the line" know. Buckle up. We're going deep on the most successful data format the web has ever seen.
You know how most companies build a GraphQL API, hit some scaling issues, and then write a blog post about it? Airbnb took a different approach: they built an entire data-oriented service mesh, ran it for five years at massive scale, and then open-sourced it. Meet Viaduct - GraphQL's ambitious cousin who went to architecture school.
Your REST API is like a teenager: it only responds when you ask it something. Repeatedly. Every second. "Any new messages?" "No." "Any new messages?" "No." "Any new messages?" "STILL NO." Enter GraphQL Subscriptions - where your API finally grows up and learns to call YOU when something interesting happens.
You've got a GraphQL interview tomorrow. Panic is setting in. Fear not - this is your survival guide. From basic concepts to system design, I've been on both sides of the table, and these are the questions that matter.
You've heard the promise: "One graph to rule them all." But your organization has 47 microservices, 12 teams, and zero patience for a monolithic schema. Enter Federation - GraphQL's answer to "it's complicated."
Resolvers are where GraphQL magic happens - and where most bugs lurk. After years of debugging production resolvers at 2 AM, I've collected these dark arts. Use them wisely.
"Just add caching" they said. "It'll be easy" they said. Three weeks later, I emerged from my cave with bloodshot eyes and a newfound respect for cache invalidation. This is my story.
You're copying the same fields across 17 different queries. Your code reviewer is crying. Your future self is plotting revenge. Enter fragments: the DRY principle applied to GraphQL queries.
Null. The billion-dollar mistake. The void that stares back. In GraphQL, null isn't just a value - it's a lifestyle choice. Let's explore the surprisingly sensual world of nullable fields.