Developer Tools
Free browser-based utilities for developers — JSON tools, CSS generators, API testing, Tailwind class builder, TypeScript interfaces, Zod schemas, SQL tables, JWT decoder, Base64, and more. No sign-up, no data uploaded.
JSON Formatter & Validator
Paste raw JSON to format, validate, and pretty-print it. Highlights syntax errors with line numbers.
JSON → TypeScript
Convert JSON to TypeScript interfaces instantly. Handles nested objects, arrays, and null values with export-ready output.
JSON → Zod Schema
Generate a Zod v3 schema from JSON with z.object, z.array, and z.infer type exports. Ready to paste into your project.
JSON → SQL Table
Generate a SQL CREATE TABLE statement from JSON. Supports PostgreSQL, MySQL, and SQLite with automatic type inference.
JSON Diff Checker
Compare two JSON objects and instantly see what changed. Color-coded diff with dot-notation paths for every change.
API Tester (Mini Postman)
Test REST APIs in your browser — all HTTP methods, query params builder, headers, auth (Bearer, Basic, API Key), request body, copy as cURL.
API Response Formatter
Fetch any API URL or paste raw JSON to format, sort, minify, and download. Shows key count, nesting depth, and size.
Mock API Generator
Define a JSON template with {{tokens}} and generate realistic mock data. Supports 22+ token types, bulk generation, and JSON download.
Fake Data Generator
Generate realistic fake JSON for users, products, orders, employees, transactions, posts, and comments. Up to 100 records.
Tailwind Class Generator
Build Tailwind CSS class strings visually — colors, typography, spacing, borders, and effects with live preview and JSX output.
CSS Shadow Generator
Generate CSS box-shadow and text-shadow code visually. Multi-layer support with presets like Soft, Glow, and Inset.
Flexbox Playground
Learn and build CSS flexbox layouts visually. All container and item properties with live preview and CSS output.
CSS Grid Generator
Build CSS grid layouts visually. Set template columns, rows, gap, and per-cell span with presets and instant CSS output.
Color Palette Generator
Generate color shades and harmonies from any hex color. Export as CSS variables, Tailwind config, or SCSS variables.
JWT Decoder
Decode any JSON Web Token instantly — inspect header, payload, and signature without sending it anywhere.
Base64 Encoder / Decoder
Encode plain text or binary strings to Base64 and decode Base64 back to the original value.
HTTP Status Code Reference
Search all HTTP status codes — 1xx informational, 2xx success, 3xx redirect, 4xx client error, 5xx server error.
API Response Visualizer
Enter any public API URL to fetch and visualize the response — status, headers, timing, and formatted JSON body.
Indian Phone Validator
Validate Indian mobile numbers — strips +91/0091/91 prefix, checks 10-digit format and TRAI rules. Bulk support.
GST Number Validator
Validate GSTIN numbers — checks format, state code, embedded PAN, entity type, and checksum digit.
PAN Card Validator
Validate PAN card numbers — decodes holder type (Individual, Company, HUF, Firm, Trust) from the 4th character.