In R, you can consume an array of JSON objects using the Plumber package to build APIs. Plumber allows you to create APIs and handle HTTP requests and responses in R. To consume an array of JSON objects, you can send a POST request with the JSON array in the request body. Here's a step-by-step guide on how to achieve this:

  1. Install and Load Plumber: If you haven't already installed the Plumber package, you can do so using the following command:
R
install.packages("plumber")

Load the Plumber library:

R
library(plumber)
  1. Define the Plumber API Endpoint: Create an R script with the Plumber API definition. In this script, define an endpoint that handles the incoming POST request containing the JSON array.

For example, create a file named my_api.R:

R
# my_api.R # Load plumber library library(plumber) #* Echo the JSON array #* @post /echo_array function(req) { # Retrieve the JSON array from the request body json_data <- req$postBody # Parse the JSON data into R objects (list, data frame, etc.) data <- jsonlite::fromJSON(json_data) # Process the JSON array (You can do any data manipulation here) result <- lapply(data, function(obj) { # Do something with each JSON object in the array # For example, obj$name to access a property 'name' # Return the processed result as a list, data frame, etc. # You can also write the data to a file, database, etc. return(obj) }) # Return the processed result as JSON return(jsonlite::toJSON(result)) } # Run the plumber API r <- plumb("my_api.R") r$run(port=8000)
  1. Run the Plumber API: Start the Plumber API by running the R script. This will start the API server and listen for incoming requests on the specified port (in this example, port 8000).

  2. Send a POST Request with JSON Array: You can use various tools or libraries to send a POST request with a JSON array to the Plumber API. For example, you can use the httr library in R:

R
library(httr) # Sample JSON array json_data <- '[{"name": "John", "age": 30}, {"name": "Alice", "age": 25}, {"name": "Bob", "age": 40}]' # Send the POST request to the Plumber API response <- httr::POST(url = "http://localhost:8000/echo_array", body = json_data, httr::add_headers("Content-Type" = "application/json")) # Get the response content response_content <- httr::content(response, "parsed") # Print the response from the API print(response_content)

This R script will send a POST request with the JSON array to the /echo_array endpoint of the Plumber API. The Plumber API will parse the JSON array, process it, and return the processed result as JSON.

Remember to adjust the API endpoint and data processing logic according to your specific use case. Plumber provides great flexibility to handle various types of JSON data and perform data manipulations as needed.

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