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Image from Blob Storage

\n {imageData\n ? (\n \n )\n : error\n ?

Error: {error}

\n :

Loading image...

}\n

\n );\n}\n\nfunction client() {\n createRoot(document.getElementById(\"root\")!).render();\n}\n\nif (typeof document !== \"undefined\") {\n client();\n}\n\nexport default async function server(request: Request): Promise {\n if (request.url.endsWith(\"/image\")) {\n try {\n const response = await blob.get(\"test.png\");\n\n return new Response(response.body, {\n headers: { \"Content-Type\": \"image/png\" },\n });\n } catch (error) {\n console.error(\"Error fetching blob:\", error);\n return new Response(JSON.stringify({ error: \"Server error\", details: error.message }), {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n }\n\n // Serve index.html, aka \"/\"\n return new Response(\n `\n \n \n Image from Blob Storage\n \n \n \n

\n \n \n \n \n `,\n {\n headers: {\n \"content-type\": \"text/html\",\n },\n },\n );\n}\n\nconst css = `\nbody {\n margin: 0;\n font-family: system-ui, sans-serif;\n display: flex;\n justify-content: center;\n align-items: center;\n min-height: 100vh;\n background-color: #f0f0f0;\n}\n#root {\n background-color: white;\n padding: 20px;\n border-radius: 8px;\n box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);\n}\nh1 {\n color: #333;\n}\n`;","deleted","label",[109],"30e9f9e8-2785-11f0-b46e-569c3dd06744","README.md","30e9fa56-2785-11f0-b46e-569c3dd06744",1,["D",1727709954507],"# getBlobAndRenderAsImage\n\nShows how to get a Val Town blob and render it as an image in the DOM with React.\n\n## Setup\n\nMake sure you have an image named `test.png` in your Val Town blob storage (alternatively, you can change the key name in the blob getter in the script).\n\nTo easily upload an image to your blob storage, [fork this val](\ngetBlobAndRenderAsImage), run it, and enter your API key in the password input.\n\n## How it works\n\n1. Fetching the blob:\n\n - The client-side React component makes a fetch request to \"/image\".\n - This request is handled by our server function.\n\n\n2. Server-side handling:\n\n - The server function calls `blob.get(\"test.png\")`.\n - This `blob.get()` method makes an HTTP request to the Val Town API.\n - The API returns a Response object containing the image data.\n\n\n3. Processing the blob on the server:\n\n - We receive this Response object from `blob.get()`.\n - We don't need to extract the data on the server side.\n - We can directly return this Response object to the client.\n\n\n4. Sending the response to the client:\n\n - We set the appropriate \"Content-Type\" header (e.g., \"image/png\").\n - We return the Response object to the client.\n\n\n5. Client-side handling:\n\n - The fetch request in the React component receives the Response.\n - We call `response.blob()` to get a Blob object from the Response.\n\n\n6. Creating a data URL:\n\n - We create a FileReader object.\n - We use FileReader to read the Blob as a data URL.\n - This data URL is a base64-encoded string representing the image.\n\n\n7. Updating the React state:\n\n - We set the data URL as the state of our component.\n\n\n8. Rendering the image:\n\n - We use the data URL as the src attribute of an `` tag.\n - The browser decodes the base64 data and renders the image.\n\n## Further reading on Val Town blobs\n\n- [Blob storage overview in Val Town docs](https://docs.val.town/std/blob/)\n- [Val Town REST API references for blobs](https://docs.val.town/openapi#tag/blobs)\n- [Val Town blob std lib source code](https://www.val.town/v/std/blob)",[125],"pulls","branches","forks","envVars",{"_138":40,"_140":40},"connections",{"_138":40,"_139":40},"count","unfilledCount","emptyCount",{"_18":124,"_20":125,"_110":126,"_111":-5,"_112":67,"_113":127,"_114":26,"_22":147,"_64":40,"_117":95,"_119":129,"_121":63,"_122":-5,"_144":148,"_84":149},{"_18":108,"_20":109,"_110":35,"_111":-5,"_112":67,"_113":65,"_114":26,"_22":143,"_64":116,"_117":118,"_119":120,"_121":63,"_122":-5,"_144":145,"_84":146},["D",1727801615583],"children",[],[109],["D",1727709954507],[],[125],["D",1746211345302],{"_16":17,"_82":78},{"_16":17,"_76":-5,"_77":78,"_32":33,"_79":80,"_81":63},{"_64":65,"_20":66,"_18":67,"_68":19,"_69":-5,"_70":-5,"_71":-5,"_72":-5,"_73":-5,"_74":21,"_75":17},"ctx",{"_56":-5,"_103":187,"_188":189,"_190":191,"_192":63,"_193":63,"_194":63,"_195":26,"_196":-5,"_197":-7,"_198":-7,"_199":40,"_200":63,"_201":63,"_202":-5,"_203":63,"_204":63,"_205":63,"_206":-5},"ENV",{"_158":159,"_160":161,"_162":66,"_163":164,"_165":166,"_167":168,"_169":170,"_171":172,"_173":174,"_175":176,"_177":178,"_179":180,"_181":182,"_183":184,"_185":186},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","811aa22498c9b0b5a47e8d778de579cdb990f332","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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