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Code  ›  Window: atob() method - Web APIs | MDN
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https://developer.mozilla.org/en-US/docs/Web/API/Window/atob
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1 月前

The atob() method of the Window interface decodes a string of data which has been encoded using Base64 encoding. You can use the Window.btoa() method to encode and transmit data which may otherwise cause communication problems, then transmit it and use the atob() method to decode the data again. For example, you can encode, transmit, and decode control characters such as ASCII values 0 through 31.

Also consider using the Uint8Array.fromBase64() method, which creates a Uint8Array object from a base64-encoded string. It results in a byte array, which is easier to work with than a string containing raw bytes.

Return value

A binary string containing raw bytes decoded from encodedData . Strings in JavaScript are encoded as UTF-16 , so this means each character must have a code point less than 256, representing one byte of data.

Exceptions

InvalidCharacterError DOMException

Thrown if encodedData is not valid base64.

Examples

js 
const encodedData = window.btoa("Hello, world"); // encode a string
const decodedData = window.atob(encodedData); // decode the string

For more examples, see the Window.btoa() method.

    
Specifications

        Specification

  • A polyfill of atob is available in core-js
    • 

  • data URLs
    • 

  • WorkerGlobalScope.atob(): the same method, but in worker scopes.
    • 

  • Window.btoa()
    • 

  • Uint8Array.fromBase64()
    • 
          Learn how to contribute 
    
    This page was last modified on  by MDN contributors.
    View this page on GitHub • Report a problem with this content
      
    1. The HTML DOM API
    2. Window
    3. Instance properties
      1. caches
      2. closed
      3. cookieStore
      4. credentialless


      5. crossOriginIsolated
      6. crypto
      7. customElements
      8. devicePixelRatio
      9. document
      10. documentPictureInPicture


      11. event


      12. external


      13. fence


      14. frameElement
      15. frames
      16. fullScreen


      17. history
      18. indexedDB
      19. innerHeight
      20. innerWidth
      21. isSecureContext
      22. launchQueue


      23. length
      24. localStorage
      25. location
      26. locationbar
      27. menubar
      28. mozInnerScreenX


      29. mozInnerScreenY


      30. name
      31. navigation


      32. navigator
      33. opener
      34. orientation


      35. origin
      36. originAgentCluster
      37. outerHeight
      38. outerWidth
      39. parent
      40. performance
      41. personalbar
      42. scheduler
      43. screen
      44. screenLeft
      45. screenTop
      46. screenX
      47. screenY
      48. scrollbars
      49. scrollMaxX


      50. scrollMaxY


      51. scrollX
      52. scrollY
      53. self
      54. sessionStorage
      55. sharedStorage


      56. speechSynthesis
      57. status


      58. statusbar
      59. toolbar
      60. top
      61. trustedTypes
      62. viewport


      63. visualViewport
      64. window
    4. Instance methods
      1. alert()
      2. atob()
      3. blur()


      4. btoa()
      5. cancelAnimationFrame()
      6. cancelIdleCallback()
      7. captureEvents()


      8. clearImmediate()



      9. clearInterval()
      10. clearTimeout()
      11. close()
      12. confirm()
      13. createImageBitmap()
      14. dump()


      15. fetch()
      16. fetchLater()


      17. find()


      18. focus()
      19. getComputedStyle()
      20. getDefaultComputedStyle()


      21. getScreenDetails()


      22. getSelection()
      23. matchMedia()
      24. moveBy()
      25. moveTo()
      26. open()
      27. postMessage()
      28. print()
      29. prompt()
      30. queryLocalFonts()


      31. queueMicrotask()
      32. releaseEvents()


      33. reportError()
      34. requestAnimationFrame()
      35. requestFileSystem()



      36. requestIdleCallback()
      37. resizeBy()
      38. resizeTo()
      39. scroll()
      40. scrollBy()
      41. scrollByLines()


      42. scrollByPages()


      43. scrollTo()
      44. setImmediate()



      45. setInterval()
      46. setResizable()



      47. setTimeout()
      48. showDirectoryPicker()


      49. showOpenFilePicker()


      50. showSaveFilePicker()


      51. sizeToContent()


      52. stop()
      53. structuredClone()
      54. webkitConvertPointFromNodeToPage()



      55. webkitConvertPointFromPageToNode()



    5. Events
      1. afterprint
      2. appinstalled
      3. beforeinstallprompt
      4. beforeprint
      5. beforeunload
      6. blur
      7. devicemotion
      8. deviceorientation
      9. deviceorientationabsolute
      10. error
      11. focus
      12. gamepadconnected
      13. gamepaddisconnected
      14. hashchange
      15. languagechange
      16. load
      17. message
      18. messageerror
      19. offline
      20. online
      21. orientationchange


      22. pagehide
      23. pagereveal
      24. pageshow
      25. pageswap
      26. popstate
      27. rejectionhandled
      28. resize
      29. scrollsnapchange


      30. scrollsnapchanging


      31. storage
      32. unhandledrejection
      33. unload


      34. vrdisplayactivate



      35. vrdisplayconnect



      36. vrdisplaydeactivate



      37. vrdisplaydisconnect



      38. vrdisplaypresentchange



    6. Inheritance
      1. EventTarget
    7. Related pages for HTML DOM
      1. BeforeUnloadEvent
      2. DOMStringMap
      3. ErrorEvent
      4. HTMLAnchorElement
      5. HTMLAreaElement
      6. HTMLAudioElement
      7. HTMLBRElement
      8. HTMLBaseElement
      9. HTMLBodyElement
      10. HTMLButtonElement
      11. HTMLCanvasElement
      12. HTMLDListElement
      13. HTMLDataElement
      14. HTMLDataListElement
      15. HTMLDialogElement
      16. HTMLDivElement
      17. HTMLDocument
      18. HTMLElement
      19. HTMLEmbedElement
      20. HTMLFieldSetElement
      21. HTMLFormControlsCollection
      22. HTMLFormElement
      23. HTMLFrameSetElement


      24. HTMLHRElement
      25. HTMLHeadElement
      26. HTMLHeadingElement
      27. HTMLHtmlElement
      28. HTMLIFrameElement
      29. HTMLImageElement
      30. HTMLInputElement
      31. HTMLLIElement
      32. HTMLLabelElement
      33. HTMLLegendElement
      34. HTMLLinkElement
      35. HTMLMapElement
      36. HTMLMediaElement
      37. HTMLMenuElement
      38. HTMLMetaElement
      39. HTMLMeterElement
      40. HTMLModElement
      41. HTMLOListElement
      42. HTMLObjectElement
      43. HTMLOptGroupElement
      44. HTMLOptionElement
      45. HTMLOptionsCollection
      46. HTMLOutputElement
      47. HTMLParagraphElement
      48. HTMLPictureElement
      49. HTMLPreElement
      50. HTMLProgressElement
      51. HTMLQuoteElement
      52. HTMLScriptElement
      53. HTMLSelectElement
      54. HTMLSourceElement
      55. HTMLSpanElement
      56. HTMLStyleElement
      57. HTMLTableCaptionElement
      58. HTMLTableCellElement
      59. HTMLTableColElement
      60. HTMLTableElement
      61. HTMLTableRowElement
      62. HTMLTableSectionElement
      63. HTMLTemplateElement
      64. HTMLTextAreaElement
      65. HTMLTimeElement
      66. HTMLTitleElement
      67. HTMLTrackElement
      68. HTMLUListElement
      69. HTMLUnknownElement
      70. HTMLVideoElement
      71. HashChangeEvent
      72. History
      73. ImageData
      74. Location
      75. MessageChannel
      76. MessageEvent
      77. MessagePort
      78. Navigator
      79. PageRevealEvent
      80. PageSwapEvent
      81. PageTransitionEvent
      82. Plugin


      83. PluginArray


      84. PromiseRejectionEvent
      85. RadioNodeList
      86. UserActivation
      87. ValidityState
      88. WorkletGlobalScope
    8. Guides
      1. Using microtasks in JavaScript with queueMicrotask()
      2. In depth: Microtasks and the JavaScript runtime environment
     
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