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# ----- REST vs GraphQL comparison ----- # REST: multiple endpoints, fixed shapes # GET /users/42 -> full user object always returned # GET /users/42/posts -> separate request # POST /users -> create user # PUT /users/42 -> update user # GraphQL: one endpoint, flexible shapes # POST /graphql with body: # 1. Query (read) query { user(id: "42") { name # only these two fields email } } # 2. Mutation (write) mutation CreateUser($input: CreateUserInput!) { createUser(input: $input) { id name } } # 3. Subscription (real-time) subscription OnNewPost { postCreated { id title author { name } } } # GraphQL never breaks old clients — just add fields, deprecate old ones: # type User { # name: String # fullName: String @deprecated(reason: "Use `name`") # }
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