Redundant curly braces in string template

Reports usages of curly braces in string templates around simple identifiers.

Use the 'Remove curly braces' quick-fix to remove the redundant braces.

Examples:

  fun redundant() {
     val x = 4
     val y = "${x}" // <== redundant
  }

  fun correctUsage() {
      val x = "x"
      val y = "${x.length}" // <== Ok
  }

After the quick-fix is applied:

  fun redundant() {
     val x = 4
     val y = "$x"
  }

  fun correctUsage() {
      val x = "x" <== Updated
      val y = "${x.length}"
  }

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.

RemoveCurlyBracesFromTemplate

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 | Kotlin | Redundant constructs

Inspection ID: RemoveCurlyBracesFromTemplate

Inspection options

Here you can find the description of settings available for the Redundant curly braces in string template inspection, and the reference of their default values.

Report also for a variables without a whitespace around

Option ID:

reportWithoutWhitespace

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 RemoveCurlyBracesFromTemplate

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

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025