Fast · Private · Free

Build faster with lightweight, browser‑based developer tools

Convert data, inspect tokens, and learn with focused guides — no sign‑up, no server uploads.

Guide

Featured Tools

Simple utilities that run entirely in your browser.

Convert CSV/Excel to JSON and back to CSV.

Decode, inspect, and encode JSON Web Tokens.

Guide

Hands‑on tutorials to help you work faster.

Learn three practical methods to convert CSV files to JSON: CLI tools, spreadsheets, and online converters — with step‑by‑step examples.

Understand the structure of JSON Web Tokens, how they differ from sessions, and common security pitfalls.

A curated list of lightweight, no-signup tools that help you work faster — from data conversion to token inspection and formatting.

Common JSON parsing errors and fast ways to diagnose and fix them in the browser and Node.js.