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#"/en-US/docs/Web/JavaScript/Reference/Global_Objects" data-glean-id="menu_click_submenu: javascript -> /en-US/docs/Web/JavaScript/Reference/Global_Objects" >Standard built-in objects
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WebAssembly memory instructions.
grow
Increase the size of the memory instance.
size
Get the size of the memory instance.
load
Load a number from memory.
store
Store a number in memory.
copy
Copy data from one region in memory to another
fill
Set all values in a region to a specific byte
This page was last modified onNov 23, 2025 byMDN contributors.
WebAssembly
WebAssembly.compile()
WebAssembly.compileStreaming()
WebAssembly.instantiate()
WebAssembly.instantiateStreaming()
WebAssembly.validate()
WebAssembly.Module
WebAssembly.Module.customSections()
WebAssembly.Module.exports()
WebAssembly.Module.imports()
WebAssembly.Module() constructor
WebAssembly.Global
WebAssembly.Global() constructor
WebAssembly.Instance
WebAssembly.Instance.prototype.exports
WebAssembly.Instance() constructor
WebAssembly.Memory
WebAssembly.Memory.prototype.buffer
WebAssembly.Memory.prototype.grow()
WebAssembly.Memory() constructor
WebAssembly.Table
WebAssembly.Table.prototype.get()
WebAssembly.Table.prototype.grow()
WebAssembly.Table.prototype.length
WebAssembly.Table.prototype.set()
WebAssembly.Table() constructor
WebAssembly.Tag
WebAssembly.Tag.prototype.type()
WebAssembly.Tag() constructor
WebAssembly.Exception
WebAssembly.Exception constructor
WebAssembly.Exception.prototype.getArg()
WebAssembly.Exception.prototype.is()
WebAssembly.Exception.prototype.stack
WebAssembly.CompileError
WebAssembly.CompileError() constructor
WebAssembly.LinkError
WebAssembly.LinkError() constructor
WebAssembly.RuntimeError
WebAssembly.RuntimeError() constructor