Node.js v13.14.0 Documentation

Table of Contents

• About this Documentation

  • Contributing
  • Stability Index
  • JSON Output
  • System calls and man pages

• Usage & Example

  • Usage
  • Example

• Assert

  • Strict assertion mode
  • Legacy assertion mode

  • Class: assert.AssertionError

    • new assert.AssertionError(options)
  • assert(value[, message])

  • assert.deepEqual(actual, expected[, message])

    • Comparison details

  • assert.deepStrictEqual(actual, expected[, message])

    • Comparison details
  • assert.doesNotMatch(string, regexp[, message])
  • assert.doesNotReject(asyncFn[, error][, message])
  • assert.doesNotThrow(fn[, error][, message])
  • assert.equal(actual, expected[, message])
  • assert.fail([message])
  • assert.fail(actual, expected[, message[, operator[, stackStartFn]]])
  • assert.ifError(value)
  • assert.match(string, regexp[, message])
  • assert.notDeepEqual(actual, expected[, message])
  • assert.notDeepStrictEqual(actual, expected[, message])
  • assert.notEqual(actual, expected[, message])
  • assert.notStrictEqual(actual, expected[, message])
  • assert.ok(value[, message])
  • assert.rejects(asyncFn[, error][, message])
  • assert.strictEqual(actual, expected[, message])
  • assert.throws(fn[, error][, message])

• Async Hooks

  • Terminology

  • Public API

    • Overview

      • async_hooks.createHook(callbacks)

        • Error Handling
        • Printing in AsyncHooks callbacks

    • Class: AsyncHook

      • asyncHook.enable()
      • asyncHook.disable()

      • Hook Callbacks

        • init(asyncId, type, triggerAsyncId, resource)

          • type
          • triggerAsyncId
          • resource
          • Asynchronous context example
        • before(asyncId)
        • after(asyncId)
        • destroy(asyncId)
        • promiseResolve(asyncId)
      • async_hooks.executionAsyncResource()
      • async_hooks.executionAsyncId()
      • async_hooks.triggerAsyncId()
  • Promise execution tracking

  • JavaScript Embedder API

    • Class: AsyncResource

      • new AsyncResource(type[, options])
      • asyncResource.runInAsyncScope(fn[, thisArg, ...args])
      • asyncResource.emitDestroy()
      • asyncResource.asyncId()
      • asyncResource.triggerAsyncId()
    • Using AsyncResource for a Worker thread pool

  • Class: AsyncLocalStorage

    • new AsyncLocalStorage()
    • asyncLocalStorage.disable()
    • asyncLocalStorage.getStore()
    • asyncLocalStorage.enterWith(store)
    • asyncLocalStorage.run(store, callback[, ...args])
    • asyncLocalStorage.exit(callback[, ...args])
    • Usage with async/await

• Buffer

  • Buffers and Character Encodings
  • Buffers and TypedArrays
  • Buffers and iteration

  • Class: Buffer

    • Class Method: Buffer.alloc(size[, fill[, encoding]])
    • Class Method: Buffer.allocUnsafe(size)
    • Class Method: Buffer.allocUnsafeSlow(size)
    • Class Method: Buffer.byteLength(string[, encoding])
    • Class Method: Buffer.compare(buf1, buf2)
    • Class Method: Buffer.concat(list[, totalLength])
    • Class Method: Buffer.from(array)
    • Class Method: Buffer.from(arrayBuffer[, byteOffset[, length]])
    • Class Method: Buffer.from(buffer)
    • Class Method: Buffer.from(object[, offsetOrEncoding[, length]])
    • Class Method: Buffer.from(string[, encoding])
    • Class Method: Buffer.isBuffer(obj)
    • Class Method: Buffer.isEncoding(encoding)
    • Class Property: Buffer.poolSize
    • buf[index]
    • buf.buffer
    • buf.byteOffset
    • buf.compare(target[, targetStart[, targetEnd[, sourceStart[, sourceEnd]]]])
    • buf.copy(target[, targetStart[, sourceStart[, sourceEnd]]])
    • buf.entries()
    • buf.equals(otherBuffer)
    • buf.fill(value[, offset[, end]][, encoding])
    • buf.includes(value[, byteOffset][, encoding])
    • buf.indexOf(value[, byteOffset][, encoding])
    • buf.keys()
    • buf.lastIndexOf(value[, byteOffset][, encoding])
    • buf.length
    • buf.parent
    • buf.readBigInt64BE([offset])
    • buf.readBigInt64LE([offset])
    • buf.readBigUInt64BE([offset])
    • buf.readBigUInt64LE([offset])
    • buf.readDoubleBE([offset])
    • buf.readDoubleLE([offset])
    • buf.readFloatBE([offset])
    • buf.readFloatLE([offset])
    • buf.readInt8([offset])
    • buf.readInt16BE([offset])