examples.js

const pino = require("pino");
const logger = pino({
    level: "trace",
    customLevels: {
        custom: 70
    }
});

// Log some basic stuff
logger.trace("Tracing request with UID fPQ-1397...");
logger.debug("Session is active");
logger.info("Log file is at /var/log/pino.log");
logger.warn("Request exceeded maximum POST body size: 16MB");
logger.error("Could not establish database connection!");
logger.fatal("Encountered a stack overflow, shutting down...");
logger.custom("Special logs require special levels.");
logger.info({
    keyOne: "1",
    keyTwo: new Buffer("test"),
    keyThree: { keyFour: [1, 2, 3], keyFive: false }
});
logger.info(new Buffer("test"));
logger.info(undefined);
logger.info(null);
logger.info(false);

// Produce an error
try {
    const result = undefinedVar1 + undefinedVar2;
} catch (err) {
    logger.error(err);
}

logger.info("All examples ran successfully!");