generated: '2026-08-27'
method: searched
source: https://lwc.dev/guide/error_codes
provider: Lightning Web Components
providerId: lightning-web-components
description: 'Error-code registry published by the Lightning Web Components project. LWC is a compiler
  and browser/server runtime rather than an HTTP API, so its error surface is compile-time and run-time
  diagnostics rather than RFC 9457 problem+json responses. Codes use the format "LWC0000: Error message".
  An "error" is blocking and stops compilation, observed in terminal or CLI output; a "warning" is a non-blocking
  diagnostic, observed in the browser web console. Some LWC codes wrap errors from underlying parsers
  (Babel for JavaScript/TypeScript, a CSS parser for stylesheets, a template parser for HTML).'
format: lwc-diagnostic-code
envelope: 'LWC<NNNN>: <message>'
severities:
- error
- warning
transport: compile-time diagnostics (terminal / CLI) and run-time warnings (browser console) — not HTTP
  responses
code_count: 109
codes:
- code: LWC1001
  description: Represents a generic, unexpected compilation error in the LWC compiler.
  severity: error
- code: LWC1002
  description: Represents a warning in module resolution.
  severity: warning
- code: LWC1005
  description: Represents an unsupported file extension error.
  severity: error
- code: LWC1006
  description: Represents a source type error on transform() or transformSync().
  severity: error
- code: LWC1007
  description: Represents a JavaScript transformer error caused by a syntax error.
  severity: error
- code: LWC1009
  description: Represents a CSS transformer error when processing CSS stylesheet files.
  severity: error
- code: LWC1011
  description: Represents an import path error.
  severity: error
- code: LWC1016
  description: Raised when a Lightning web component tries to assign a value to a getter, which is not
    permitted.
  severity: error
- code: LWC1021
  description: Represents an error for an invalid outputConfig.sourcemap value.
  severity: error
- code: LWC1023
  description: Represents an error on the options object.
  severity: error
- code: LWC1024
  description: Represents a file content error.
  severity: error
- code: LWC1027
  description: Represents an error that's thrown when a string is expected for an ID.
  severity: error
- code: LWC1028
  description: Represents a template compiler error when the configuration parameter is not an object.
  severity: error
- code: LWC1030
  description: Represents an unrecognized property error on the template compiler.
  severity: error
- code: LWC1034
  description: Represents an error for an ambiguous attribute value.
  severity: error
- code: LWC1035
  description: Represents an ambiguous attribute value error in the template compiler.
  severity: error
- code: LWC1036
  description: Represents an error for a boolean attribute that's incorrectly set.
  severity: error
- code: LWC1037
  description: Represents a boolean attribute value error.
  severity: error
- code: LWC1038
  description: Represents a computed property access error in a template expression.
  severity: error
- code: LWC1039
  description: Represents an iterator directive error.
  severity: error
- code: LWC1040
  description: Represents an id value whitespace error.
  severity: error
- code: LWC1041
  description: Represents a static id value error.
  severity: error
- code: LWC1042
  description: Represents a duplicate id value error.
  severity: error
- code: LWC1043
  description: Represents an attribute error on an event handler.
  severity: error
- code: LWC1044
  description: Represents an error that's caused by using the for:each or for:item directive without the
    other.
  severity: error
- code: LWC1045
  description: Represents a literal value error on a for:each directive.
  severity: error
- code: LWC1046
  description: Represents a value error on the for:index directive.
  severity: error
- code: LWC1047
  description: Represents a value error on the for:item directive.
  severity: error
- code: LWC1048
  description: Represents an error that occurs when the srcdoc attribute is used on an iframe.
  severity: error
- code: LWC1049
  description: Represents an SVG tag error in the <svg> namespace.
  severity: error
- code: LWC1050
  description: Represents an invalid MathML tag error.
  severity: error
- code: LWC1051
  description: Represents a forbidden template tag error.
  severity: error
- code: LWC1052
  description: Represents an unexpected error during template compilation.
  severity: error
- code: LWC1054
  description: Represents an error that occurs when the if:* directive is assigned to a string literal
    or has no value.
  severity: error
- code: LWC1055
  description: Represents a case error in HTML attribute names.
  severity: error
- code: LWC1056
  description: Represents a naming error on an event handler attribute.
  severity: error
- code: LWC1057
  description: Represents a warning when an invalid attribute is used on an HTML element.
  severity: warning
- code: LWC1058
  description: Represents an invalid HTML syntax error.
  severity: error
- code: LWC1063
  description: Represents an is attribute error.
  severity: error
- code: LWC1064
  description: Represents a key attribute error.
  severity: error
- code: LWC1065
  description: Represents an invalid key value on an element.
  severity: error
- code: LWC1066
  description: Represents an invalid key value for an element.
  severity: error
- code: LWC1071
  description: Represents an error for a missing key for an element in an iterator.
  severity: error
- code: LWC1072
  description: Represents an error for a missing root template tag.
  severity: error
- code: LWC1074
  description: Represents an error for an expression that contains a semicolon.
  severity: error
- code: LWC1075
  description: Represents an error for a template that contains more than one root-level node.
  severity: error
- code: LWC1076
  description: Represents an error for a slot name is assigned to a dynamic expression.
  severity: error
- code: LWC1077
  description: Represents an error for a non-root template tag that doesn't contain a directive.
  severity: error
- code: LWC1078
  description: Represents an error for a missing closing tag.
  severity: error
- code: LWC1079
  description: Represents an error for a missing root <template> element.
  severity: error
- code: LWC1080
  description: Represents an error for an invalid attribute on the root <template> element.
  severity: error
- code: LWC1082
  description: Represents an error for an invalid template directive on the <slot> element.
  severity: error
- code: LWC1083
  description: Represents a template parsing error when JavaScript expressions in HTML templates have
    syntax errors, unbalanced brackets, or other parsing issues.
  severity: error
- code: LWC1084
  description: 'Represents an invalid modifier on the if: directive.'
  severity: error
- code: LWC1085
  description: Represents an invalid value on the lwc:dom directive.
  severity: error
- code: LWC1086
  description: Represents an error for a non-empty element with the lwc:dom directive.
  severity: error
- code: LWC1087
  description: Represents an error for a custom element with the lwc:dom directive.
  severity: error
- code: LWC1088
  description: Represents an error for an lwc:dom directive on any <slot> element.
  severity: error
- code: LWC1092
  description: Represents an error for a missing parameter on a wire adapter.
  severity: error
- code: LWC1093
  description: Represents an @api and @track combined usage error.
  severity: error
- code: LWC1094
  description: Represents an @wire configuration object error.
  severity: error
- code: LWC1095
  description: Represents an @api and @wire combined use error.
  severity: error
- code: LWC1096
  description: Represents a duplicate @api property error.
  severity: error
- code: LWC1097
  description: Represents a wire adapter identifier error.
  severity: error
- code: LWC1098
  description: Represents an error when a @wire decorator's first parameter references a local binding.
  severity: error
- code: LWC1099
  description: Represents an error on the default value of a boolean public property.
  severity: error
- code: LWC1100
  description: Represents an error for invalid decorator usage.
  severity: error
- code: LWC1101
  description: Represents an error for a decorator applied to a private class member.
  severity: error
- code: LWC1102
  description: Represents an error for a decorator not properly imported from the lwc module.
  severity: error
- code: LWC1105
  description: Represents an error for multiple @wire decorators on a single method or property.
  severity: error
- code: LWC1106
  description: Represents an @api error when the decorator is used with the computed property syntax.
  severity: error
- code: LWC1107
  description: Represents an error for a property name that starts with the "data" prefix.
  severity: error
- code: LWC1108
  description: Represents an error for a property name that starts with the "on" prefix.
  severity: error
- code: LWC1109
  description: Represents an error for a lowercase attribute name that corresponds to a property that
    uses a camelCase name.
  severity: error
- code: LWC1110
  description: Represents an error for a property name that corresponds to a reserved HTML attribute name.
  severity: error
- code: LWC1111
  description: Represents an error for a property name that corresponds to a future reserved attribute
    name.
  severity: error
- code: LWC1112
  description: Represents an error for a duplicate @api declaration on a getter and setter.
  severity: error
- code: LWC1113
  description: Represents an error for a @track decorator that is applied to a class method, getter, or
    setter.
  severity: error
- code: LWC1116
  description: Represents an error for an invalid folder name.
  severity: error
- code: LWC1121
  description: Represents an error for an invalid import.
  severity: error
- code: LWC1122
  description: Represents an error for a <style> element inside an LWC component's HTML template.
  severity: error
- code: LWC1123
  description: Represents a warning for an unknown HTML tag.
  severity: warning
- code: LWC1124
  description: Represents an error for an attribute name in an LWC template starts with an invalid character.
  severity: error
- code: LWC1125
  description: Represents an error for an attribute name in an LWC template that ends with a non-alphanumeric
    character.
  severity: error
- code: LWC1127
  description: 'Represents an error for using an invalid lwc: directive on an element in an LWC template.'
  severity: error
- code: LWC1128
  description: Represents an error for using lwc:dynamic without enabling the compiler option.
  severity: error
- code: LWC1129
  description: Represents an error for using lwc:dynamic on an element that is not a custom element.
  severity: error
- code: LWC1130
  description: Represents an error for passing a string literal to lwc:dynamic.
  severity: error
- code: LWC1131
  description: Represents an error when you use computed property syntax to access a wire adapter in the
    first parameter of the @wire decorator.
  severity: error
- code: LWC1132
  description: Represents an error that occurs when the @wire identifier contains nested member expressions.
  severity: error
- code: LWC1133
  description: Represents an error for setting lwc:render-mode to an invalid value.
  severity: error
- code: LWC1134
  description: Represents an error for invalid attributes on a <slot>element.
  severity: error
- code: LWC1135
  description: Represents an error for using lwc:dom="manual" on an element inside a Light DOM template.
  severity: error
- code: LWC1136
  description: Represents an error placing for:each and iterator:* on the same element.
  severity: error
- code: LWC1137
  description: Represents a warning for defining multiple slots with the same name within the same rendering
    context.
  severity: warning
- code: LWC1138
  description: Represents a warning for placing slots inside iteration blocks.
  severity: warning
- code: LWC1139
  description: Represents an error for adding an event listener to a <slot> element inside a Light DOM
    template.
  severity: error
- code: LWC1140
  description: Represents an error for applying lwc:inner-html to a non-native HTML element.
  severity: error
- code: LWC1141
  description: Represents an error for using lwc:inner-html on <slot> or <template>.
  severity: error
- code: LWC1143
  description: Represents an error for an invalid lwc:inner-html usage on an element.
  severity: error
- code: LWC1144
  description: Represents a warning for invalid HTML nesting.
  severity: warning
- code: LWC1149
  description: Represents a warning for an invalid key attribute.
  severity: warning
- code: LWC1197
  description: Represents an error that occurs when comments are used within template expressions.
  severity: error
- code: LWC1199
  description: Represents an error that occurs when a template literal is used with the @wire configuration
    object.
  severity: error
- code: LWC1200
  description: Represents an error that occurs when an invalid expression is used in the @wire configuration
    object.
  severity: error
- code: LWC1201
  description: Represents a warning that occurs when an element with a slot attribute isn't a direct child
    of a component.
  severity: warning
- code: LWC1703
  description: Represents an invalid module identifier.
  severity: error
- code: LWC1704
  description: Represents a missing resource value.
  severity: error
- code: LWC1709
  description: Represents a syntax error when parsing a file.
  severity: error
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com