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 jsonData = await blob.getJSON(\"image-test\");\n return new Response(JSON.stringify(jsonData), {\n headers: { \"Content-Type\": \"application/json\" },\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",[125],"31a06872-2785-11f0-b46e-569c3dd06744","README.md","31a068ea-2785-11f0-b46e-569c3dd06744",1,["D",1727800817769],"# getJsonAndRenderAsImage\n\nShows how to get a JSON object containing a base64 imaged stored in Val Town blob storage and render it as an image in the DOM with React.\n\n## Setup\n\nMake sure you have a JSON object named `image-test` in your Val Town blob storage (alternatively, you can change the key name in the blob getter in the script).\n\nThe object should look like this:\n\n```json\n{\n \"image\": \"base64stringgoeshere\"\n}\n```\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 JSON:\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.getJSON(\"image-test\")`.\n - This `blob.getJSON()` method makes an HTTP request to the Val Town API.\n - The API returns a Response object containing the JSON data.\n\n\n3. Processing the blob on the server:\n\n - We receive this Response object from `blob.getJSON()`.\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., \"application/json\").\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.json()` to parse the JSON object from the Response.\n\n\n6. Creating a data URL:\n\n - We extract the image data from the JSON object at `data.image`.\n - We prepend the data URL prefix to the image data.\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)",[141],"pulls","forks","envVars",{"_153":34,"_155":34},"connections",{"_153":34,"_154":34},"count","unfilledCount","emptyCount",{"_20":140,"_13":141,"_126":142,"_127":-5,"_128":21,"_129":143,"_130":40,"_22":162,"_29":34,"_133":103,"_135":145,"_137":76,"_138":-5,"_159":163,"_91":164},{"_20":124,"_13":125,"_126":49,"_127":-5,"_128":21,"_129":30,"_130":40,"_22":158,"_29":132,"_133":134,"_135":136,"_137":76,"_138":-5,"_159":160,"_91":161},["D",1727805569681],"children",[],[125],["D",1727800817769],[],[141],["D",1746211346450],{"_11":12,"_89":85},{"_11":12,"_83":-5,"_84":85,"_46":47,"_86":87,"_88":76},{"_29":30,"_13":26,"_20":21,"_27":28,"_31":32,"_33":34,"_77":42,"_78":79,"_80":55,"_81":14,"_82":12},"ctx",{"_69":-5,"_113":202,"_203":204,"_205":206,"_207":76,"_208":76,"_209":76,"_210":40,"_211":-5,"_212":-7,"_213":-7,"_214":34,"_215":76,"_216":76,"_217":-5,"_218":76,"_219":76,"_220":76,"_221":-5},"ENV",{"_173":174,"_175":176,"_177":26,"_178":179,"_180":181,"_182":183,"_184":185,"_186":187,"_188":189,"_190":191,"_192":193,"_194":195,"_196":197,"_198":199,"_200":201},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","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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