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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

By ID

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

JSOctalInteger
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 ID: JSOctalInteger

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

Option ID:

myReportNonStrictEs5

Default value:

Not selected

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection JSOctalInteger

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Last modified: 18 September 2025