Developer Tools

44 tools

Encode, format, convert, and inspect — everyday developer utilities.

Runtimes

Python Playground

Write and run Python in your browser with WebAssembly.

#Python#Runtime

JSON & Data

JSON Formatter

Format, validate, and beautify JSON.

#JSON#Formatter

JSON-LD Schema Generator

Build valid schema.org structured data — Organization, Product, FAQ, Article and more — with a live preview.

#SEO#Schema

JSON to TypeScript

Infer TypeScript interfaces or Zod schemas from any JSON sample.

#JSON#Dev

JSON to YAML

Convert JSON to YAML and back.

#JSON#YAML#Converter

JSON to CSV

Convert JSON arrays to CSV and back.

#JSON#CSV#Converter

SQL Formatter

Format and beautify SQL queries.

#SQL#Formatter

Diff Checker

Compare two texts and highlight differences.

#Text#Compare

Encoding

Base64 Encoder/Decoder

Encode and decode Base64 strings.

#Encoding#Dev

HTML Entity Encoder

Encode text to HTML entities and decode them back, named or numeric.

#Encoding#HTML

Number Base Converter

Convert integers between binary, octal, decimal, hex, and any base to 36.

#Encoding#Dev

URL Encoder/Decoder

Encode and decode URLs and query strings.

#Encoding#URL

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.

#Security#Encoding

UUID Generator

Generate random UUIDs (v4) in bulk.

#Generator#Dev

Text Case Converter

Convert text between twelve naming cases.

#Text#Converter

QR Code Generator

Create custom QR codes for any purpose.

#Generator#Popular

QR Code Reader

Decode QR codes from images, locally.

#QR#Decoder

Web & API

URL Parser

Break any URL into protocol, host, path, and decoded query parameters.

#Web#URL

UTM Link Builder

Tag campaign URLs with UTM parameters and keep recent links handy.

#Marketing#URL

Meta Tag Generator

Generate title, description, Open Graph, and Twitter tags with live previews.

#SEO#HTML

Nginx Config Builder

Generate nginx server blocks: HTTPS, redirects, gzip, caching, proxy or PHP.

#Nginx#Server

GDPR Checker

Pick your product type, answer a short set of questions, and get a GDPR score with concrete fixes for every gap.

#GDPR#Privacy#Compliance

Database URL Builder

Build or decode Postgres and MySQL connection strings, with code for every stack.

#PostgreSQL#MySQL#Database

Barcode Generator

Create CODE128, EAN-13, UPC, CODE39 and more — as PNG or SVG, one at a time or zipped batches.

#Barcode#Generator

JWT Decoder

Decode and inspect JSON Web Tokens.

#JWT#Auth

Regex Tester

Test and debug regular expressions live.

#Regex#Dev

HTTP Status Checker

Look up HTTP status codes and their meanings.

#HTTP#Reference

User-Agent Parser

Parse user-agent strings into browser, OS, and device.

#HTTP#Dev

cURL to Code

Translate curl commands into fetch, axios, or Python requests code.

#Web#Dev

.env File Linter

Catch duplicate keys, broken quoting, and placeholder secrets in .env files.

#Config#Dev

Formatting

XML Formatter

Format, validate, and minify XML documents.

#XML#Formatter

HTML Formatter

Format and beautify HTML markup.

#HTML#Formatter

CSS Formatter

Format and minify CSS stylesheets.

#CSS#Formatter

JS Formatter

Format and minify JavaScript code.

#JavaScript#Formatter

Markdown Editor

Write Markdown with a live preview.

#Markdown#Editor

Markdown HTML Converter

Convert Markdown to HTML and back.

#Markdown#HTML#Converter

CSS & Layout

Flexbox Playground

Toggle every flex property, watch the layout animate, copy the CSS.

#CSS#Layout

CSS Grid Generator

Shape columns and rows, span items, and copy clean grid-template CSS.