Node.jspackage.json manifest chứa scripts (lifecycle hooks), dependencies/devDependencies, engines (Node version), exports (conditional entry points), và workspaces (monorepo). package.json là manifest file của Node.js project. scripts hỗ trợ lifecycle hooks: preinstall/postinstall chạy trước/sau npm install, prebuild/postbuild bao quanh build — dùng để codegen, copy assets. engines: { node: '>=18.0.0' } báo CI/CD và người dùng version Node cần thiết, npm cảnh báo nếu không match.
Entry points: main (CJS fallback), module (ESM cho bundlers hỗ trợ), exports (field mới nhất — conditional exports theo environment): { '.': { import: './dist/index.mjs', require: './dist/index.cjs' } }. type: 'module' đặt default module system là ESM cho tất cả .js files. workspaces: ['packages/*'] cho monorepo — npm install một lần, symlink packages. peerDependencies khai báo packages host app phải cung cấp (tránh duplicate React trong component libraries).
package.json manifest holds scripts (lifecycle hooks), dependencies/devDependencies, engines (Node version), exports (conditional entry points), and workspaces (monorepo). package.json is the manifest file for a Node.js project. scripts supports lifecycle hooks: preinstall/postinstall run before/after npm install, prebuild/postbuild wrap build — used for codegen and copying assets. engines: { node: '>=18.0.0' } tells CI/CD and users which Node version is required; npm warns if it doesn't match.
Entry points: main (CJS fallback), module (ESM for supporting bundlers), exports (the newest field — conditional exports by environment): { '.': { import: './dist/index.mjs', require: './dist/index.cjs' } }. type: 'module' sets the default module system to ESM for all .js files. workspaces: ['packages/*'] for monorepos — single npm install, symlinked packages. peerDependencies declares packages the host app must provide (avoids duplicate React instances in component libraries).