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The process of converting a nested array JSON into a JSON with a single-level array using Node.js involves the following steps:

1. Parse the nested array JSON using the built-in JSON.parse() method in Node.js to convert the JSON string into a JavaScript object.

2. Use the Array.flat() method to flatten the nested array into a single-level array. The flat() method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.

3. Use the JSON.stringify() method to convert the flattened array into a JSON string.

4. Write the flattened JSON string to a file or use it in your application as required.

Here is an example code snippet for converting a nested array JSON into a JSON with a single-level array using Node.js:

const fs = require('fs');

// Sample nested array JSON
const nestedArrayJson = `{"employees": [{"name": "John Doe", "age": 30, "skills": ["JavaScript", "Node.js", "React"]}, {"name": "Jane Doe", "age": 25, "skills": ["Python", "Django"]}]}`;

// Parse the nested array JSON
const nestedArrayObj = JSON.parse(nestedArrayJson);

// Flatten the nested array into a single-level array
const flatArray = nestedArrayObj.employees.flat();

// Convert the flattened array into a JSON string
const flatArrayJson = JSON.stringify({ employees: flatArray });

// Write the flattened JSON string to a file
fs.writeFile('flattened.json', flatArrayJson, (err) => {
  if (err) throw err;
  console.log('Flattened JSON saved!');
});