JavaScript ErrorsError

TypeError: Cannot read properties of undefined/null

errorCodes.js-typeerror-cannot-read-properties.name

errorCodes.js-typeerror-cannot-read-properties.description

browsernode

type-system runtime

What causes this error

errorCodes.js-typeerror-cannot-read-properties.cause

How to fix it

errorCodes.js-typeerror-cannot-read-properties.fix

Example

const user = undefined; console.log(user.name); // TypeError

Official Documentation

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errorCodes.js-eacces.name

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ERR_INVALID_ARG_TYPE

errorCodes.js-err-invalid-arg-type.name

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ReferenceError: x is not defined

errorCodes.js-referenceerror-not-defined.name

errorCodes.js-referenceerror-not-defined.description

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UnhandledPromiseRejection

errorCodes.js-unhandled-promise-rejection.name

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ERR_BUFFER_OUT_OF_BOUNDS

errorCodes.js-err-buffer-out-of-bounds.name

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SyntaxError: Missing initializer in const declaration

errorCodes.js-syntaxerror-missing-initializer-const.name

errorCodes.js-syntaxerror-missing-initializer-const.description