What it is
PM2 is an open source project that solves a concrete engineering task in its ecosystem. Its value is that a team gets a ready foundation instead of starting from an empty file.
The project became popular because it addresses a repeated developer pain: building an interface, networking layer, terminal utility, payment process, or infrastructure service faster.
PM2's main task is to provide a clear abstraction around that task while still leaving room for product-specific configuration.
What is inside
Inside the repository are source code, documentation, usage examples, contribution rules, and a related ecosystem of packages or integrations. This helps evaluate the project beyond its short description.
The project material shows not only installation, but also typical scenarios: how to connect the library, extend behavior, and understand responsibility boundaries.
How people use it
PM2 is usually used where manual implementation would quickly become repetitive and risky. A ready project reduces custom variants and makes behavior more predictable.
For a team, this becomes a shared language. Instead of private versions of the same task, there is a documented approach that is easier to review and maintain.
Example
A minimal example
This example shows the basic way to think about the project: a small scenario that can be extended for real tasks.
pm2 start app.js --name api
pm2 logs api
pm2 reload api
pm2 saveStrengths
PM2's strength is practicality. The project is not only an abstract idea; people use it when they need to close a real part of development faster.
Another advantage is community maturity. Bugs, edge cases, and integrations have often already appeared for other users and are reflected in issues, documentation, or examples.
Limitations
The limitation is that a ready project does not remove engineering decisions. Versions, compatibility, security, performance, and architecture fit still need attention.
It is also important not to pull a whole project for one tiny function. If the task is simple, a local solution may be better than increasing the stack.
Who it fits
PM2 fits teams that already have a real problem and want to rely on a proven open tool instead of a set of temporary scripts.
For learning, the project is useful because it shows how real solutions are organized: code structure, documentation, tests, releases, and limits.
In the catalog, PM2 matters as a repository that shows a mature open source area: not only a library, but also the practice around it.
A practical start is to take the smallest example, test it on a real scenario, and only then add extensions, plugins, or complex configuration.