jsonfieldexplorer/index.js

Node.js tool to efficiently explore and list all field paths in a JSON object. Perfect for understanding complex JSON structures, it recursively analyzes JSON data to provide a clear summary of nested fields and arrays.

#!/usr/bin/env node
import { processJson } from "./jfe.js";
import { readFile } from "./file.js";

function usageInstructions() {
  // Either path to file, or pipe JSON to stdin
  console.log("Usage: ");
  console.log("\tjfe <path-to-file>");
  console.log("\tcat <path-to-file> | jfe");
  console.log('\techo \'{"a": [{"b": true}]}\' | jfe');
}

function parseStdin() {
  return new Promise((resolve) => {
    if (process.stdin.isTTY) {
      usageInstructions();
      process.exit(1);
    }
    // If no file name is provided, listen to standard input
    let inputData = "";
    process.stdin.on("data", (chunk) => (inputData += chunk));
    process.stdin.on("end", () => {
      try {
        const json = JSON.parse(inputData);
        resolve(json);
      } catch (error) {
        console.error("Error parsing JSON from standard input:", error.message);
        process.exit(1);
      }
    });
  });
}

async function main() {
  const filePath = process.argv[2];
  const json = filePath ? readFile(filePath) : await parseStdin();
  processJson(json);
}

main();