How to loop through array elements within JSON string to create multiple products in Shopify order API

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1

I’m trying to build an order through the Shopify API, but I need assistance with creating the JSON string dynamically. Here’s the code I have:

string orderString = @"
{
  ""order"": {
    ""line_items"": [
      {
        ""variant_id"": " + variantIdArray[0] + @",
        ""quantity"": " + quantityArray[0] + @"
      }
    ],
    ""customer"": {
      ""id"": 2750996643918
    },
    ""financial_status"": ""pending""
  }
}
";

Currently, I’m only able to add one product since I’m hardcoding the index [0]. I have two arrays (variantIdArray and quantityArray) and I want to loop through them to include multiple products in the line items. How can I use a for loop to achieve this while keeping it in string format for the API request?

2

totally agree, building JSON by hand is tough! try using StringBuilder or better yet, create objects and serialize them. here’s a quick example: var lineItems = new List<object>(); for(int i=0; i<variantIdArray.Length; i++) { lineItems.Add(new { variant_id = variantIdArray[i], quantity = quantityArray[i] }); } then serialize it with Newtonsoft or System.Text.Json.

3

Had the same issue when I started with Shopify’s API. Don’t build JSON strings manually - use a proper object structure instead. Create a dynamic object like this: var order = new { order = new { line_items = variantIdArray.Select((id, index) => new { variant_id = id, quantity = quantityArray[index] }).ToArray(), customer = new { id = 2750996643918 }, financial_status = "pending" } }; then use JsonConvert.SerializeObject(order) to get your JSON string. Way cleaner - no syntax errors and it handles the array iteration for you.

4

I’ve hit this same JSON issue before. String concatenation works fine if you build the line_items array first, then drop it into your main template. Loop through and construct the line items string separately: string lineItemsJson = ""; for(int i = 0; i < variantIdArray.Length; i++) { lineItemsJson += $"{{\"variant_id\": {variantIdArray[i]}, \"quantity\": {quantityArray[i]}}}"; if(i < variantIdArray.Length - 1) lineItemsJson += ","; } Watch your commas though - they’ll break the JSON if you mess up.