Optimizely will be sunsetting Full Stack Experimentation on July 29, 2024. See the recommended Feature Experimentation migration timeline and documentation.

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VSCode Extension

This topic describes how to integrate the Optimizely VScode extension into VSCode.

Optimizely VSCode Extension

The Optimizely VSCode extension autocompletes the following parameters in Javascript, Typescript, and React:

  • feature keys
  • experiment keys
  • feature variables
  • event keys

In other languages, you can insert the preceding list of elements using keyboard shortcuts.

This extension also evaluates if provided feature keys are valid for Optimizely's public SDK methods (for example, getFeatureVariable(feature_key, userID, attributes), or isFeatureEnabled(feature_key, userID)) for Javascript and TypeScript. If a given feature_key is invalid (i.e., does not exist in the datafile for the SDK key used in "Optimizely: config" command), the extension highlights it and displays a warning on hover.

The Optimizely VSCode extension is compatible with 1.34 and higher of VSCode.

Features & keyboard shortcuts

  • Auto-complete for experiment and feature key parameters as well as feature variables when applicable. (e.g. getFeatureVariable(feature_key, 'list of variables) and getFeatureVarableString('feature_key, 'only list of string feature variable keys)
  • Open feature or experiment edit page from IDE. Simply highlight the feature key or experiment key and hit command-option-o.
  • List Experiment variations or feature variables - select experiment or feature key, command-option-v
  • List Attribute Keys - command-option-a.
  • List Events - command-option-e
  • List Experiment Keys - command-option-x
  • List Feature Keys - command-option-f
  • Command "optimizely: Configuration Debug Dialog" will bring up a debug dialog within the IDE that has your current sdk key. You can run activate and isFeatureEnabled and getFeatureVariable functions changing the attribute to make sure you have the right configuration for your feature rollout. If you change sdk keys, you should open a new dialog.

Installation and configuration

On installation of the Optimizely extension, VSCode will not prompt you to configure the extension. To add your SDK Key and configure the extension, run the "Optimizely: Configure" command from your command pallete.


If you use quick suggestions to autocomplete words, Optimizely autocomplete functionality requires the editor.quickSuggestions.strings setting to be enabled. Otherwise, you will need to press Ctrl+Space (default binding) to see your flag key suggestions.

Here is an example configuration with quick suggestions enabled:

  "editor.quickSuggestions": {
    "other": true,
    "comments": false,
    "strings": true