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Octal integer

Reports a deprecated octal integer literal prefixed with 0 instead of 0o.

Such literals are not allowed in modern ECMAScript code, and using them in the strict mode is an error.

To force this inspection for ES5 and ES3 language levels, select the 'Warn about obsolete octal literals in ES5- code' checkbox below.

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | JavaScript and TypeScript | Validity issues

Inspection options

Here you can find the description of settings available for the Octal integer inspection, and the reference of their default values.

Warn about obsolete octal literals in ES5- code

Not selected


By default bundled with

CLion 2024.1, GoLand 2024.1, IntelliJ IDEA 2024.1, JetBrains Rider 2023.3, PhpStorm 2024.1, PyCharm 2024.1, Qodana for .NET 2023.3, Qodana for Go 2024.1, Qodana for JS 2024.1, Qodana for JVM 2024.1, Qodana for PHP 2024.1, Qodana for Ruby 2024.1, RubyMine 2024.1, WebStorm 2024.1

Can be installed with plugin

JavaScript and TypeScript, 241.18072

Last modified: 18 June 2024