{"id":52033,"date":"2023-04-13T06:33:00","date_gmt":"2023-04-13T06:33:00","guid":{"rendered":"https:\/\/kinsta.com\/se\/?p=52033&#038;post_type=knowledgebase&#038;preview_id=52033"},"modified":"2025-10-01T20:00:54","modified_gmt":"2025-10-01T20:00:54","slug":"react-must-be-in-scope-when-using-jsx","status":"publish","type":"post","link":"https:\/\/kinsta.com\/se\/blog\/react-must-be-in-scope-when-using-jsx\/","title":{"rendered":"S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet &#8221;React must be in scope when using JSX&#8221; (5 metoder)"},"content":{"rendered":"<p>Att arbeta med <a href=\"https:\/\/kinsta.com\/blog\/what-is-react-js\/\">React<\/a> kan ibland vara sv\u00e5rt, s\u00e4rskilt n\u00e4r det g\u00e4ller fel som inte alltid \u00e4r l\u00e4tta att f\u00f6rst\u00e5.<\/p>\n<p>Ett vanligt fel som utvecklare kan st\u00f6ta p\u00e5 \u00e4r felet &#8221;React must be in scope when using JSX&#8221;. Det h\u00e4r felet uppst\u00e5r n\u00e4r React inte importeras eller initieras korrekt i en komponent som anv\u00e4nder JSX-syntax.<\/p>\n<p>I den h\u00e4r artikeln kommer vi att diskutera orsakerna till det h\u00e4r felet och sedan ge l\u00f6sningar p\u00e5 hur man \u00e5tg\u00e4rdar det.<\/p>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc>\n<h2>Vad orsakar felet &#8221;react must be in scope when using jsx&#8221;?<\/h2>\n<p>JSX (JavaScript XML) \u00e4r ett syntaxtill\u00e4gg som exempelvis g\u00f6r att du kan skriva <a href=\"https:\/\/kinsta.com\/blog\/what-is-html\/\">HTML<\/a>-liknande kod i <a href=\"https:\/\/kinsta.com\/javascript\/\">JavaScript<\/a>. Webbl\u00e4sare f\u00f6rst\u00e5r inte JSX. F\u00f6rkonfigurerade verktygsl\u00e5dor som Create React App inneh\u00e5ller dock ett JSX-omvandlingsverktyg under huven som omvandlar JSX-koden till giltig JavaScript-kod som kan tolkas av webbl\u00e4sare.<\/p>\n<p>I React-versioner f\u00f6re 17.0 omvandlades JSX till <code>React.createElement()<\/code>-funktionsanrop av JSX-transformatorn vid kompileringstiden. Detta kr\u00e4vde exempelvis att React importerades f\u00f6r att React-elementen skulle fungera. Med inf\u00f6randet av en ny JSX-transformator i React v17.0 importeras dock s\u00e4rskilda funktioner fr\u00e5n React-paketets nya ing\u00e5ngspunkter automatiskt. Som ett resultat elimineras behovet av att importera React i varje fil som anv\u00e4nder JSX explicit.<\/p>\n<p>Som exempel kan vi ta en titt p\u00e5 f\u00f6ljande funktionskomponent:<\/p>\n<pre><code class=\"language-jsx\">function App() {\n  return &lt;h1&gt;Welcome to Kinsta!&lt;\/h1&gt;;\n}<\/code><\/pre>\n<p>Vid kompilering omvandlas den till vanlig JavaScript:<\/p>\n<pre><code class=\"language-jsx\">function App() {\n  return React.createElement('h1', null, 'Welcome to Kinsta!');\n}<\/code><\/pre>\n<p>Eftersom React \u00e4r odefinierat kommer detta alltid att ge felet &#8221;&#8217;React must be in scope when using JSX&#8221;.<\/p>\n\n<h2>2 s\u00e4tt att \u00e5tg\u00e4rda felet &#8221;react must be in scope when using jsx&#8221;<\/h2>\n<p>Det h\u00e4r felet kan \u00e5tg\u00e4rdas p\u00e5 n\u00e5gra olika s\u00e4tt beroende p\u00e5 vilken version av React som du anv\u00e4nder.<\/p>\n<ul>\n<li>F\u00f6re React v17<\/li>\n<li>React v17 och h\u00f6gre<\/li>\n<\/ul>\n<h3>1. Inkludera eller korrigera React-importdeklarationen (fix f\u00f6r f\u00f6re React v17)<\/h3>\n<p>Om du anv\u00e4nder en \u00e4ldre version av React kan det h\u00e4nda att du saknar eller har en felaktig importdeklaration f\u00f6r &#8221;react&#8221;. Kontrollera att du har r\u00e4tt importdeklaration h\u00f6gst upp i filen (med ett stort &#8221;R&#8221; p\u00e5 &#8221;React&#8221;):<\/p>\n<pre><code class=\"language-jsx\">\/\/ Wrong \u274c\nimport react  from 'react';\n\n\/\/ Correct \u2705\nimport React  from 'react';<\/code><\/pre>\n<p>Din funktionella komponent kommer nu att se ut s\u00e5 h\u00e4r n\u00e4r den omvandlas till vanlig <a href=\"https:\/\/kinsta.com\/blog\/errors-in-javascript\/\">JavaScript<\/a>:<\/p>\n<pre><code class=\"language-jsx\">import React  from 'react';\n\nfunction App() {\n  return React.createElement('h1', null, 'Welcome to Kinsta!');\n}<\/code><\/pre>\n<h3>2. Uppdatera ESLint-konfigurationen (fix f\u00f6r React v17 och h\u00f6gre)<\/h3>\n<p>I React v17.0 inf\u00f6rdes en <a href=\"https:\/\/legacy.reactjs.org\/blog\/2020\/09\/22\/introducing-the-new-jsx-transform.html\" target=\"_blank\" rel=\"noopener noreferrer\">ny JSX-transform<\/a> som automatiskt importerar specialfunktioner fr\u00e5n React-paketets nya ing\u00e5ngspunkter. Som ett resultat beh\u00f6ver du inte importera React i varje fil som uttryckligen anv\u00e4nder JSX.<\/p>\n<p>Ta exempelvis f\u00f6ljande funktionella komponent:<\/p>\n<pre><code class=\"language-jsx\">function App() {\n  return &lt;h1&gt;Welcome to Kinsta!&lt;\/h1&gt;;\n}<\/code><\/pre>\n<p>Det h\u00e4r \u00e4r vad den nya JSX-transformen kompilerar den till:<\/p>\n<pre><code class=\"language-jsx\">\/\/ Inserted by a compiler (don't import it yourself!)\nimport {jsx as _jsx} from 'react\/jsx-runtime';\n\nfunction App() {\n  return _jsx('h1', { children: 'Welcome to Kinsta!' });\n}<\/code><\/pre>\n<p>Det betyder att du inte l\u00e4ngre beh\u00f6ver importera React i dina komponenter f\u00f6r att anv\u00e4nda JSX. Forts\u00e4tter du att m\u00f6ta det h\u00e4r felet \u00e4ven efter att ha kontrollerat din <strong>package.json<\/strong>-fil f\u00f6r att bekr\u00e4fta din React-version? D\u00e5 m\u00e5ste du uppdatera dina <a href=\"https:\/\/www.npmjs.com\/package\/eslint-config-react-app\" target=\"_blank\" rel=\"noopener noreferrer\">ESLint-konfigurationer<\/a>.<\/p>\n<p>I det h\u00e4r skedet \u00e4r detta tekniskt sett inte l\u00e4ngre ett React-fel utan snarare ett ESLint-fel.<\/p>\n<p><strong>Obs:<\/strong> Du anv\u00e4nder ofta linting-verktyg som ESLint i ditt React-projekt. Det kontrollerar n\u00e4mligen din kod f\u00f6r att uppt\u00e4cka potentiella fel som antingen kan krascha din kod nu eller i framtiden. Det h\u00e4r verktyget tvingar dig att importera React n\u00e4r det uppt\u00e4cker n\u00e5gon JSX runt filen.<\/p>\n<p>N\u00e4r du \u00e4r s\u00e4ker p\u00e5 att din React-version \u00e4r v17.0 eller h\u00f6gre \u00e4r det s\u00e4kert att inaktivera reglerna som ser till att du importerar React n\u00e4r du anv\u00e4nder JSX.<\/p>\n<p>Det finns tv\u00e5 huvudsakliga s\u00e4tt att uppdatera ESLint-konfigurationer. Om du har en <strong>.eslintrc.js<\/strong> eller <strong>.eslintrc.json<\/strong>-fil: L\u00e4gg till f\u00f6ljande regler i din <strong>.eslintrc.js<\/strong>-fil.<\/p>\n<pre><code class=\"language-json\">\"rules\": {\n  \/\/ ...\n  \"react\/react-in-jsx-scope\": \"off\",\n  \"react\/jsx-uses-react\": \"off\",\n }<\/code><\/pre>\n<p>Annars kan du uppdatera <code>eslintConfig<\/code>-objektet i din <strong>package.json<\/strong>-fil:<\/p>\n<pre><code class=\"language-json\">{\n  \"name\": \"quotes-circle\",\n  \/\/ ...\n  \"dependencies\": {\n    \/\/ ...\n  },\n  \"eslintConfig\": {\n    \"extends\": [\n      \"react-app\",\n      \"react-app\/jest\"\n    ],\n    \"rules\": {\n      \"react\/jsx-uses-react\": \"off\",\n      \"react\/react-in-jsx-scope\": \"off\"\n    }\n  },\n}<\/code><\/pre>\n<p>I koden ovan \u00e4r regeln <a href=\"https:\/\/github.com\/jsx-eslint\/eslint-plugin-react\/blob\/master\/docs\/rules\/react-in-jsx-scope.md\" target=\"_blank\" rel=\"noopener noreferrer\">react-in-jsx-scope<\/a> avst\u00e4ngd. Som ett resultat kommer ESLint inte att skapa fel n\u00e4r du inte lyckas importera React.<\/p>\n<p>Vid det h\u00e4r laget borde du ha \u00e5tg\u00e4rdat felet &#8221;react must be in scope when using jsx&#8221; en g\u00e5ng f\u00f6r alla. Men det kan h\u00e4nda att n\u00e5got kom i v\u00e4gen f\u00f6r dig och att felet fortfarande finns kvar.<\/p>\n<p>L\u00e5t oss ta en titt p\u00e5 ytterligare n\u00e5gra s\u00e4tt f\u00f6r dig att f\u00f6rs\u00f6ka \u00e5tg\u00e4rda detta.<\/p>\n<h2>Ytterligare 3 s\u00e4tt att \u00e5tg\u00e4rda felet &#8221;react must be in scope when using jsx&#8221;<\/h2>\n<p>Anta att felet fortfarande kvarst\u00e5r. H\u00e4r \u00e4r ytterligare tre s\u00e4tt att \u00e5tg\u00e4rda felet &#8221;react must be in scope when using jsx&#8221;.<\/p>\n<h3>1. Uppdatera versionen av React-skripten<\/h3>\n<p>Du kan uppdatera versionen av ditt projekts <strong>react-scripts<\/strong> genom att k\u00f6ra f\u00f6ljande kommando i din terminal:<\/p>\n<pre><code class=\"language-bash\">\/\/ npm\nnpm install react-scripts@latest\n\n\/\/ yarn\nyarn add react-scripts@latest<\/code><\/pre>\n<h3>2. Ta bort mappen Node_modules och filen package-lock.json<\/h3>\n<p>Om felet kvarst\u00e5r \u00e4r det m\u00f6jligt att n\u00e5gra av dina beroenden \u00e4r felaktigt installerade. Du kan \u00e5tg\u00e4rda detta genom att radera mappen <strong>node_modules<\/strong> och filen <strong>package-lock.json<\/strong> (inte <strong>package.json<\/strong>). K\u00f6r sedan f\u00f6ljande kommando f\u00f6r att installera paketen p\u00e5 nytt:<\/p>\n<pre><code class=\"language-bash\">npm install<\/code><\/pre>\n<p>Starta sedan om din dev-server.<\/p>\n<h3>3. Uppdatera versionerna av React och React-Dom<\/h3>\n<p>Om felet kvarst\u00e5r uppdaterar du slutligen dina versioner av <strong>react<\/strong> och <strong>react-Dom<\/strong> med hj\u00e4lp av kommandona nedan:<\/p>\n<pre><code class=\"language-bash\">\/\/ npm\nnpm install react@latest react-dom@latest\n\n\/\/ if you use TypeScript\nnpm install --save-dev @types\/react@latest @types\/react-dom@latest\n\n\/\/ OR\n\n\/\/ Yarn\nyarn add react@latest react-dom@latest\n\n\/\/ if you use TypeScript\nyarn add @types\/react@latest @types\/react-dom@latest --dev<\/code><\/pre>\n<p>Vid denna tidpunkt \u00e4r det s\u00e4kert att felet kommer att \u00e5tg\u00e4rdas.<\/p>\n<h2>Sammanfattning<\/h2>\n<p>Felet &#8221;React must be in scope when using JSX&#8221; \u00e4r ett vanligt problem som <a href=\"https:\/\/kinsta.com\/se\/blog\/typer-av-utvecklare\/\">utvecklare<\/a> kan st\u00f6ta p\u00e5 n\u00e4r de arbetar med React. Det h\u00e4r felet f\u00f6rekommer fr\u00e4mst i tidigare versioner av React v17 n\u00e4r JSX-syntaxen anv\u00e4nds i en fil. React-biblioteket importeras eller inkluderas helt enkelt inte p\u00e5 r\u00e4tt s\u00e4tt. Det f\u00f6rekommer dessutom i h\u00f6gre versioner av React v17 n\u00e4r ESLint-konfigurationer visar felet eller n\u00e4r vissa beroenden i mappen <strong>node_modules <\/strong>\u00e4r felaktigt installerade.<\/p>\n<p>Beroende p\u00e5 vilken React-version som du arbetar med finns det olika s\u00e4tt att \u00e5tg\u00e4rda det h\u00e4r felet, vilket vi beskrev i artikeln.<\/p>\n<p><em>Nu \u00e4r det din tur: Har du n\u00e5gonsin st\u00f6tt p\u00e5 det h\u00e4r problemet? Hur l\u00f6ste du det? Finns det n\u00e5gra andra tillv\u00e4gag\u00e5ngss\u00e4tt som inte tas upp i den h\u00e4r artikeln? Ber\u00e4tta f\u00f6r oss i kommentarerna!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Att arbeta med React kan ibland vara sv\u00e5rt, s\u00e4rskilt n\u00e4r det g\u00e4ller fel som inte alltid \u00e4r l\u00e4tta att f\u00f6rst\u00e5. Ett vanligt fel som utvecklare kan &#8230;<\/p>\n","protected":false},"author":287,"featured_media":52034,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[808,809],"class_list":["post-52033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-react","topic-react-fel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hur man fixar \u201cReact Must Be in Scope When Using JSX\u201d-felet - Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"L\u00e4r dig hur du fixar det st\u00f6riga felet \u201creact must be in scope when using jsx\u201d med n\u00e5gon av dessa 5 metoder.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/se\/blog\/react-must-be-in-scope-when-using-jsx\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du felet &quot;React must be in scope when using JSX&quot; 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