Winston Dev Format

What

Pretty log output for local development.

Why

In production you should probably be logging JSON as it makes it easier to log complex objects and filter and search them later. But JSON is hard to read.

Make your life easier during development by logging in a format that's easier to read.

How

const { createLogger, format, transports } = require("winston");
const devFormat = require("winston-dev-format");

// set up the logger however you like
const isProduction = process.env.NODE_ENV === "production";
const logger = createLogger({
  format: isProduction
    ? format.json()
    : format.combine(format.colorize(), devFormat()), // <-- here
  transports: [new transports.Console()],
});

// get logging
logger.info("Some things", {
  timestamp: new Date(),
  nested: { some: { complex: "object", with: [1, "array"] } },
  "and then": "a\nmulti\nline\nstring",
  func: function hello() {},
});
logger.warn("It is pitch black. You are likely to be eaten by a grue.");
logger.error("Unexpected monkeys", { result: new Error("HTTP 500") });

Uses Node's built in util.format to render values.

License

MIT