Node.js (1)

- About these Docs
- Synopsis
- Assertion Testing
- Buffer
- C/C++ Addons
- Child Processes
- Cluster
- Console
- Crypto
- Debugger
- DNS
- Domain
- Errors
- Events
- File System
- Globals
- HTTP
- HTTPS
- Modules
- Net
- OS
- Path
- Process
- Punycode
- Query Strings
- Readline
- REPL
- Stream
- String Decoder
- Timers
- TLS/SSL
- TTY
- UDP/Datagram
- URL
- Utilities
- V8
- VM
- ZLIB

# Console#

    Stability: 2 - Stable

The `console` module provides a simple debugging console that is similar to the JavaScript console mechanism provided by web browsers.

The module exports two specific components:

- A `Console` class with methods such as `console.log()`, `console.error()` and `console.warn()` that can be used to write to any Node.js stream.
- A global `console` instance configured to write to `stdout` and `stderr`. Because this object is global, it can be used without calling `require('console')`.

Example using the global `console`:

    console.log('hello world');
      // Prints: hello world, to stdout
    console.log('hello %s', 'world');
      // Prints: hello world, to stdout
    console.error(new Error('Whoops, something bad happened'));
      // Prints: [Error: Whoops, something bad happened], to stderr

    const name = 'Will Robinson';
    console.warn(`Danger ${name}! Danger!`);
      // Prints: Danger Will Robinson! Danger!, to stderr

Example using the `Console` class:

    const out = getStreamSomehow();
    const err = getStreamSomehow();
    const myConsole = new console.Console(out, err);

    myConsole.log('hello world');
      // Prints: hello world, to out
    myConsole.log('hello %s', 'world');
      // Prints: hello world, to out
    myConsole.error(new Error('Whoops, something bad happened'));
      // Prints: [Error: Whoops, something bad happened], to err

    const name = 'Will Robinson';
    myConsole.warn(`Danger ${name}! Danger!`);
      // Prints: Danger Will Robinson! Danger!, to err

While the API for the `Console` class is designed fundamentally around the Web browser `console` object, the `Console` is Node.js is not intended to duplicate the browsers functionality exactly.

## Asynchronous vs Synchronous Consoles#

The console functions are synchronous when the destination is a terminal or a file (to avoid lost messages in case of premature exit) and asynchronous when the destination is a pipe (to avoid blocking for long periods of time).

In the following example, stdout is non-blocking while stderr is blocking:

    $ node script.js 2> error.log | tee info.log

Typically, the distinction between blocking/non-blocking is not important unless an application is logging significant amounts of data. High volume logging should use a `Console` instance that writes to a pipe.

## Class: Console#

The `Console` class can be used to create a simple logger with configurable output streams and can be accessed using either `require('console').Console` or `console.Console`:

    const Console = require('console').Console;
    const Console = console.Console;

### new Console(stdout[, stderr])#

Creates a new `Console` by passing one or two writable stream instances. `stdout` is a writable stream to print log or info output. `stderr` is used for warning or error output. If `stderr` isn't passed, the warning and error output will be sent to the `stdout`.

    const output = fs.createWriteStream('./stdout.log');
    const errorOutput = fs.createWriteStream('./stderr.log');
    // custom simple logger
    const logger = new Console(output, errorOutput);
    // use it like console
    var count = 5;
    logger.log('count: %d', count);
    // in stdout.log: count 5

The global `console` is a special `Console` whose output is sent to `process.stdout` and `process.stderr`. It is equivalent to calling:

    new Console(process.stdout, process.stderr);

### console.assert(value[, message][, ...])#

A simple assertion test that verifies whether `value` is truthy. If it is not, an `AssertionError` is throw. If provided, the error `message` is formatted using `util.format()` and used as the error message.

    console.assert(true, 'does nothing');
      // OK
    console.assert(false, 'Whoops %s', 'didn\'t work');
      // AssertionError: Whoops didn't work

### console.dir(obj[, options])#

Uses `util.inspect()` on `obj` and prints the resulting string to stdout. This function bypasses any custom `inspect()` function defined on `obj`. An optional `options` object may be passed that alters certain aspects of the formatted string:

- `showHidden` - if `true` then the object's non-enumerable and symbol properties will be shown too. Defaults to `false`.

- `depth` - tells `inspect` how many times to recurse while formatting the object. This is useful for inspecting large complicated objects. Defaults to `2`. To make it recurse indefinitely, pass `null`.

- `colors` - if `true`, then the output will be styled with ANSI color codes. Defaults to `false`. Colors are customizable; see [customizing `util.inspect()` colors][].

### console.error([data][, ...])#

Prints to stderr with newline. Multiple arguments can be passed, with the first used as the primary message and all additional used as substitution values similar to `printf()` (the arguments are all passed to `util.format()`).

    const code = 5;
    console.error('error #%d', code);
      // Prints: error #5, to stderr
    console.error('error', code);
      // Prints: error 5, to stderr

If formatting elements (e.g. `%d`) are not found in the first string then `util.inspect()` is called on each argument and the resulting string values are concatenated. See `util.format()` for more information.

### console.info([data][, ...])#

The `console.info()` function is an alias for `console.log()`.

### console.log([data][, ...])#

Prints to stdout with newline. Multiple arguments can be passed, with the first used as the primary message and all additional used as substitution values similar to `printf()` (the arguments are all passed to `util.format()`).

    var count = 5;
    console.log('count: %d', count);
      // Prints: count: 5, to stdout
    console.log('count: ', count);
      // Prints: count: 5, to stdout

If formatting elements (e.g. `%d`) are not found in the first string then `util.inspect()` is called on each argument and the resulting string values are concatenated. See `util.format()` for more information.

### console.time(label)#

Used to calculate the duration of a specific operation. To start a timer, call the `console.time()` method, giving it a unique `label` as the only parameter. To stop the timer, and to get the elapsed time in milliseconds, just call the `console.timeEnd()` method, again passing the timer's unique `label` as the parameter.

### console.timeEnd(label)#

Stops a timer that was previously started by calling `console.time()` and prints the result to stdout:

    console.time('100-elements');
    for (var i = 0; i < 100; i++) {
      ;
    }
    console.timeEnd('100-elements');
    // prints 100-elements: 262ms

### console.trace(message[, ...])#

Prints to stderr the string `'Trace :'`, followed by the `util.format()` formatted message and stack trace to the current position in the code.

    console.trace('Show me');
      // Prints: (stack trace will vary based on where trace is called)
      //  Trace: Show me
      //    at repl:2:9
      //    at REPLServer.defaultEval (repl.js:248:27)
      //    at bound (domain.js:287:14)
      //    at REPLServer.runBound [as eval] (domain.js:300:12)
      //    at REPLServer.<anonymous> (repl.js:412:12)
      //    at emitOne (events.js:82:20)
      //    at REPLServer.emit (events.js:169:7)
      //    at REPLServer.Interface._onLine (readline.js:210:10)
      //    at REPLServer.Interface._line (readline.js:549:8)
      //    at REPLServer.Interface._ttyWrite (readline.js:826:14)

### console.warn([data][, ...])#

The `console.warn()` function is an alias for `console.error()`.