Read & Write JSON File

Node.js

Technical Specification

Read a JSON file, update a field, and write it back to disk.

Input/Output Samples

Input:config.json with {"visits": 1}

Output:Updated to {"visits": 2}

Optimal Logic Path

const fs = require("fs");

const data = JSON.parse(fs.readFileSync("config.json", "utf8"));
data.visits = (data.visits || 0) + 1;
fs.writeFileSync("config.json", JSON.stringify(data, null, 2));

Architectural Deep-Dive

We read JSON as text, parse to object, modify it, then stringify and write back.