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* Assert * Calling `assert.fail()` with more than one argument is deprecated. #70dcacd710 * Calling `assert.ok()` with no arguments will now throw. #3cd7977a42 * Calling `assert.ifError()` will now throw with any argument other than `undefined` or `null`. Previously the method would throw with any truthy value. #e65a6e81ef * The `assert.rejects()` and `assert.doesNotReject()` methods have been added for working with async functions. #599337f43e * Async_hooks * Older experimental async_hooks APIs have been removed. #1cc6b993b9 * Buffer * Uses of `new Buffer()` and `Buffer()` outside of the `node_modules` directory will now emit a runtime deprecation warning. #9d4ab90117 * `Buffer.isEncoding()` now returns `undefined` for falsy values, including an empty string. #452eed956e * `Buffer.fill()` will throw if an attempt is made to fill with an empty `Buffer`. #1e802539b2 * Child Process * Undefined properties of env are ignored. #38ee25e2e2, #85739b6c5b * Console * The `console.table()` method has been added. #97ace04492 * Crypto * The `crypto.createCipher()` and `crypto.createDecipher()` methods have been deprecated. Please use `crypto.createCipheriv()` and `crypto.createDecipheriv()` instead. #81f88e30dd * The `decipher.finaltol()` method has been deprecated. #19f3927d92 * The `crypto.DEFAULT_ENCODING` property has been deprecated. #6035beea93 * The `ECDH.convertKey()` method has been added. #f2e02883e7 * The `crypto.fips` property has been deprecated. #6e7992e8b8 * Dependencies * V8 has been updated to 6.6. #9daebb48d6 * OpenSSL has been updated to 1.1.0h. #66cb29e646 * EventEmitter * The `EventEmitter.prototype.off()` method has been added as an alias for `EventEmitter.prototype.removeListener()`. #3bb6f07d52 * File System * The `fs.promises` API provides experimental promisified versions of the `fs` functions. #329fc78e49 * Invalid path errors are now thrown synchronously. #d8f73385e2 * The `fs.readFile()` method now partitions reads to avoid thread pool exhaustion. #67a4ce1c6e * HTTP * Processing of HTTP Status codes `100`, `102-199` has been improved. #baf8495078 * Multi-byte characters in URL paths are now forbidden. #b961d9fd83 * N-API * The n-api is no longer experimental. #cd7d7b15c1 * Net * The `'close'` event will be emitted after `'end'`. #9b7a6914a7 * Perf_hooks * The `PerformanceObserver` class is now an `AsyncResource` and can be monitored using `async_hooks`. #009e41826f * Trace events are now emitted for performance events. #9e509b622b * The `performance` API has been simplified. #2ec6995555 * Performance milestone marks will be emitted as trace events. #96cb4fb795 * Process * Using non-string values for `process.env` is deprecated. #5826fe4e79 * The `process.assert()` method is deprecated. #703e37cf3f * REPL * REPL now experimentally supports top-level await when using the `--experimental-repl-await` flag. #eeab7bc068 * The previously deprecated "magic mode" has been removed. #4893f70d12 * The previously deprecated `NODE_REPL_HISTORY_FILE` environment variable has been removed. #60c9ad7979 * Proxy objects are shown as Proxy objects when inspected. #90a43906ab * Streams * The `'readable'` event is now always deferred with nextTick. #1e0f3315c7 * A new `pipeline()` method has been provided for building end-to-data stream pipelines. #a5cf3feaf1 * Experimental support for async for-await has been added to `stream.Readable`. #61b4d60c5d * Timers * The `enroll()` and `unenroll()` methods have been deprecated. #68783ae0b8 * TLS * The `tls.convertNONProtocols()` method has been deprecated. #9204a0db6e * Support for NPN (next protocol negotiation) has been dropped. #5bfbe5ceae * The `ecdhCurve` default is now `'auto'`. #af78840b19 * Trace Events * A new `trace_events` top-level module allows trace event categories to be enabled/disabld at runtime. #da5d818a54 * URL * The WHATWG URL API is now a global. #312414662b * Util * `util.types.is[…]` type checks have been added. #b20af8088a * Support for bigint formatting has been added to `util.inspect()`. #39dc947409
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Global Objects
These objects are available in all modules. The following variables may appear to be global but are not. They exist only in the scope of modules, see the module system documentation:
The objects listed here are specific to Node.js. There are a number of built-in objects that are part of the JavaScript language itself, which are also globally accessible.
Class: Buffer
- {Function}
Used to handle binary data. See the buffer section.
__dirname
This variable may appear to be global but is not. See __dirname.
__filename
This variable may appear to be global but is not. See __filename.
clearImmediate(immediateObject)
clearImmediate is described in the timers section.
clearInterval(intervalObject)
clearInterval is described in the timers section.
clearTimeout(timeoutObject)
clearTimeout is described in the timers section.
console
- {Object}
Used to print to stdout and stderr. See the console section.
exports
This variable may appear to be global but is not. See exports.
global
- {Object} The global namespace object.
In browsers, the top-level scope is the global scope. This means that
within the browser var something will define a new global variable. In
Node.js this is different. The top-level scope is not the global scope;
var something inside a Node.js module will be local to that module.
module
This variable may appear to be global but is not. See module.
process
- {Object}
The process object. See the process object section.
require()
This variable may appear to be global but is not. See require().
setImmediate(callback[, ...args])
setImmediate is described in the timers section.
setInterval(callback, delay[, ...args])
setInterval is described in the timers section.
setTimeout(callback, delay[, ...args])
setTimeout is described in the timers section.
URL
The WHATWG URL class. See the URL section.
URLSearchParams
The WHATWG URLSearchParams class. See the URLSearchParams section.