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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"FeatureFlag keyFilter only prefixes the first item when using a comma for multiple keys","articleBody":"Hi, during our integration of Azure App Configuration using this sdk, we encountered the following bug.\n\nWhen filtering feature-flags using a keyFilter, the keyFilter is automatically prefixed with '.appconfig.featureflag/' (required to distinguish feature flags from other settings). According to the jsdoc comment for the keyFilter, it is possible to use a comma separated list to select multiple features, provided you spell out the entire feature-flag and don't use a wildcard. But when using a comma separated list, only the first item is prefixed. As a result only the first requested feature-flag is fetched.\n\nEXAMPLE\n```\nimport { load } from '@azure/app-configuration-provider'\nimport { DefaultAzureCredential } from '@azure/identity'\n\nconst credentials = new DefaultAzureCredential()\nconst appConfig = await load('URL_TO_APP_CONFIG', credentials, {\n  featureFlagOptions: {\n    enabled: true,\n    selectors: [\n      { keyFilter: 'FEATURE_1,FEATURE_2' }\n    ],\n    refresh: {\n      enabled: true,\n    },\n  },\n})\n```\n\nEXPECTED BEHAVIOUR:\nBoth FEATURE_1 and FEATURE_2 flags are fetched\n\nACTUAL BEHAVIOUR:\nOnly FEATURE_1 is fetched\n\nWe confirmed this is a result of the automatic prefixing by manually inserting the prefix for all items except the first one. When we do that, all feature-flags are fetched.","author":{"url":"https://github.com/MitchelKerckhaert","@type":"Person","name":"MitchelKerckhaert"},"datePublished":"2026-01-12T16:24:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/262/AppConfiguration-JavaScriptProvider/issues/262"}