Documentation Index
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Overview
The Logger provides structured logging with log levels, namespaces, custom transports, and works in both Node.js and browsers.
Import
import { createLogger, Logger } from "bytekit";
// or
import { createLogger } from "bytekit/logger";
Create Logger
const logger = createLogger({
namespace: "app",
level: "info",
transports: [consoleTransport()]
});
Logger namespace for identification
Minimum log level: “silent” | “error” | “warn” | “info” | “debug”
Custom transports for log output
Methods
error
logger.error(message: string, meta?: Record<string, unknown>)
warn
logger.warn(message: string, meta?: Record<string, unknown>)
info
logger.info(message: string, meta?: Record<string, unknown>)
debug
logger.debug(message: string, meta?: Record<string, unknown>)
child
Create a child logger with additional namespace.
const childLogger = logger.child("submodule");
Usage Example
import { createLogger } from "bytekit";
const logger = createLogger({
namespace: "api",
level: "info"
});
logger.info("User logged in", {
userId: "123",
timestamp: new Date().toISOString()
});
logger.error("Failed to fetch data", {
error: error.message,
endpoint: "/users"
});
// Child logger
const dbLogger = logger.child("database");
dbLogger.debug("Query executed", { query: "SELECT * FROM users" });
Custom Transports
import { createLogger, Transport } from "bytekit";
const fileTransport: Transport = (entry) => {
// Write to file
fs.appendFileSync("app.log", JSON.stringify(entry) + "\n");
};
const logger = createLogger({
transports: [fileTransport]
});
See Also