Add Container OCR to Your Replit App in 5 Minutes

The problem: Standard AI can't read vertical text on rusted steel

Cloud-based AI environments like Replit are remarkable at writing boilerplates and orchestrating backend environments — but they stop at the boundary of specialized document parsing. You can build a beautiful freight tracking interface in minutes, yet the actual extraction of an 11-character container number from vertically stacked text on corrugated steel doors requires a dedicated Container OCR API. Standard vision models routinely fail to read text split across metal ridges or stacked top-to-bottom.

The solution: ISO 6346 precision, instantly

StructOCR's /v1/container endpoint accepts an image stream and returns a clean, fully typed JSON object with the validated ISO 6346 container number, instantly decoding the owner prefix, category, and check digit. Because it runs as a pure REST API, your Replit container can talk to it effortlessly via a zero-dependency server-side request.

Integrate StructOCR in Replit (3 Steps)

1. 1

   Describe your app to Replit Agent

   Open replit.com and start a new workspace using Replit Agent. Describe the logistics tool you want to build — be explicit about the scanning interface.

   💬Try this prompt: "Build a mobile-friendly yard management application using React and Node.js. Users can upload a photo of shipping container doors, and the app will display the extracted container number, owner code, and check digit."
2. 2

   Instruct the Agent to connect to the StructOCR endpoint

   Once the foundational UI and backend scaffolding are ready, paste the follow-up prompt into the Agent chat panel. Replit Agent will generate the network logic, wire up file stream uploads, and pipe the extracted data safely to your view state.

   💬Follow-up prompt: "When a user uploads a container image, create a backend endpoint that forwards it as a multipart/form-data POST request to https://api.structocr.com/v1/container. Authenticate using the bearer token stored in process.env.STRUCTOCR_KEY. Return the JSON payload back to the client UI."

   // Replit Agent wires this up inside your Express/Next server handler securely const response = await fetch('https://api.structocr.com/v1/container', { method: 'POST', headers: { Authorization: `Bearer ${process.env.STRUCTOCR_KEY}` }, body: formData, });
3. 3

   Add your StructOCR API key to Replit Secrets

   Navigate to the Tools → Secrets menu in your Replit editor workspace sidebar. Add a new key named STRUCTOCR_KEY and paste your private API token into the value field. The workspace environment automatically loads the variable.

   💬Variable name: STRUCTOCR_KEY — get your free key at structocr.com/dashboard

   Key: STRUCTOCR_KEY Value: sk_live_xxxxxxxxxxxxxxxx

What you can build in Replit with this integration

• Gate automation app: Let truck drivers or gate inspectors snap a photo of the container to automatically log the entry/exit time and verify the container number against the manifest.
• Yard management system (YMS): Build a mobile app for yard jockeys to scan container numbers and update parking slot locations in real-time. A core feature of modern logistics automation hosted in cloud environments.
• Freight forwarding tracker: Create a tool where warehouse staff scan containers during loading/unloading to generate instant status updates for end-customers.
• Damage inspection portal: Add an upload step to a container inspection flow: extract the container number automatically from the damage photos to link the evidence to the correct asset.

The prompt and the code

Copy the follow-up prompt text into your Replit Agent chat interface to implement the bridge handler. The backend example indicates how Replit typically handles file proxying to protect production secrets.

Prerequisite: A free StructOCR account — get your API key at structocr.com/dashboard (no credit card required)

I need to add shipping container OCR to this application using a secure backend endpoint.

When a file is uploaded to our express app:
1. Forward it as multipart/form-data to: POST https://api.structocr.com/v1/container
2. Include the header: Authorization: Bearer ${process.env.STRUCTOCR_KEY}
3. The response is JSON with fields: data.container_number, data.is_valid, data.parsed.owner_code, data.parsed.check_digit
4. Pass this object to the client so it can display the extracted container number and the decoded parts in the results panel
5. Show a loading spinner while the request is in flight
6. Show an error message if the upload fails

Read the API token using process.env.STRUCTOCR_KEY.

What the API returns

Not just the raw string—the API automatically validates the check digit and breaks down the components. Your cloud application built via Replit Agent can bind this data structure directly.

{
  "success": true,
  "data": {
    "container_number": "ZCSU8921655",
    "is_valid": true,
    "confidence": "High",
    "parsed": {
      "owner_code": "ZCS",
      "category": "U",
      "serial_number": "892165",
      "check_digit": "5"
    }
  }
}