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The procedure for transmitting an array to a NestJS API from a Flutter application involves the following steps:

1. Create an HTTP client in your Flutter application using the http package.

2. Define the array that you want to transmit as a Dart List.

3. Convert the Dart List to a JSON object using the built-in jsonEncode() method.

4. Send the JSON object to the NestJS API using an HTTP POST request.

5. In the NestJS API, create a POST endpoint that accepts JSON data.

6. Use the @Body() decorator to bind the incoming JSON data to a variable.

7. Convert the incoming JSON data to an array using the JSON.parse() method.

8. Process and store the array as required by your application.

Sample Flutter code:

import 'dart:convert';
import 'package:http/http.dart' as http;

void main() async {
  final apiUrl = 'http://your-api-url.com/array-endpoint';
  final List<int> sampleArray = [1, 2, 3, 4, 5];
  final jsonData = jsonEncode(sampleArray);
  final response = await http.post(apiUrl, body: jsonData);
}

Sample NestJS code:

import { Controller, Post, Body } from '@nestjs/common';

@Controller()
export class ArrayController {
  @Post('/array-endpoint')
  processArray(@Body() data: any) {
    const array = JSON.parse(data);
    // Process and store the array as required.
  }
}