Developer Tools That Just Work
Format JSON, run SQL queries, write Java, format Python — all free, all instant, all in your browser.
Config Diff
Config Studio
Python Tools Hub
Python helpers for formatting, packaging, dataclasses, and debugging tracebacks.
Spring Boot Tools Hub
Browse Spring Boot converters, validators, generators, and delivery helpers.
Bulk Password Generator
Generate up to 9999 passwords with URL parameters, custom characters, downloads, and optional hashes.
Requirements to pyproject
Convert requirements.txt lines into PEP 621 pyproject dependency entries.
Schema Studio Hub
Browse all Schema Studio tools — test data, migrations, API collections, converters, and JSON codegen.
String Escape & Unescape
Escape or unescape strings for JSON, Java, JavaScript, URL, HTML, XML, Unicode \u and Base64 — live, in your browser.
ASCII Banner Generator
Create large terminal, README, and source-code comment banners with configurable subtitles, borders, and wrappers.
Cron Expression Builder
Build cron schedules visually, get plain-English explanations, preview next run times, and copy Spring @Scheduled snippets.
Dataclass Generator
Generate Python dataclasses from field definitions with types, defaults, and repr settings.
SQL Playground
Write SQL queries against sample schemas — results as table
String Utils
Case converter, find & replace, trim, sort lines, deduplicate, slugify, padding and character stats — all client-side.
Test Data Generator
Generate SQL INSERTs, JSON fixtures, and CSV from CREATE TABLE statements.
Image to ASCII Art
Convert uploaded images into ASCII art with width, contrast, invert, and color options.
JSON Path Finder
Click any node to get its JSONPath expression
Load Test Data Pack
Generate 100, 1k, or 10k row seed packs for performance demos.
Log Line Parser
Parse Spring Boot, JSON structured, Log4j, and Apache/Nginx access logs into a searchable table — filter by level and export JSON.
Properties / YAML Validator
Validate your application.properties or .yml — syntax errors, deprecated keys, common misconfigurations.
Python Formatter
Format Python code to PEP 8 standard in your browser
Strikethrough Text Generator
Generate strikethrough, underline, slash, double-strike, and decorative Unicode text for Facebook, Twitter/X, Instagram, LinkedIn, and more.
ASCII Generator
Generate stylized ASCII text, separators, boxed headers, and comment-ready text art.
CSV → SQL INSERT
Upload CSV and generate bulk INSERT statements.
HTML Playground
Write HTML, CSS and JS — see live preview instantly
JPA Entity Generator
Paste a SQL CREATE TABLE and get a fully annotated @Entity class with Lombok, relationships, and Bean Validation.
Regex Tester
Live match highlighting, capture groups, and a replace preview — JavaScript regex flavor, entirely in your browser.
Traceback Explainer
Extract the failing frame, exception type, and likely fix from a Python traceback.
Anonymization Script Generator
Generate staging-safe UPDATE scripts to redact PII columns.
Markdown ↔ HTML
Convert Markdown to HTML or HTML to Markdown with a live rendered preview — client-side, powered by marked and Turndown.
Project Generator
Generate multi-model REST projects for Spring Boot, Laravel, FastAPI, or ASP.NET — folder preview and ZIP download.
Flyway / Liquibase Generator
Convert CREATE TABLE SQL into Flyway or Liquibase migration files.
Java 8 Streams Visualizer
Build Java 8 stream pipelines visually. Drag & drop operations, see the output, get AI explanations and quiz questions.
Security Config Builder
Pick your auth strategy (JWT, OAuth2, Basic, Form) and get a production-ready SecurityFilterChain class.
SQL Interview Lab
Practice 100+ runnable SQL interview questions with HR, ecommerce, and blog analytics schemas. Includes official answers, SQLite execution, and AI explanations.
Boot 2 → 3 Migration Assistant
Rewrite deprecated Spring Boot 2.x properties, comment removed keys, and convert javax imports to jakarta — with a live diff.
Diff Checker
Interactive SQL learning — GROUP BY, JOINs, window functions, HAVING. Real SQLite execution, AI explanations.
Postman / Bruno Collection Generator
Generate Postman v2.1 or Bruno collections with CRUD and auth headers.
Css Loaders
Interactive 40+ Css loaders and framework code generators
cURL Script Pack Generator
Download a bash script with CRUD cURL commands.
Profile Config Splitter
Split multi-profile application config into focused dev, test, and prod blocks.
API Contract Test Generator
REST Assured, Pest, or pytest contract test stubs.
Code Minifier tool
Code Minifier tool - HTML, CSS, JS, TS, Python, Java, Ruby, PHP, and Rust with rich extra features
Exception Handler Generator
Generate a @RestControllerAdvice with typed handlers and consistent error payloads.
Code Snippet Generator
Generate ready-to-use code snippets for Bootstrap, Tailwind, Laravel Blade, Java JSP, Python, Go, Rust, React, Vue, Angular, and more.
CSV ↔ JSON ↔ XML ↔ YAML
Convert tabular and structured data between CSV, JSON, XML and YAML in one click — all client-side.
Mock Server Config Generator
WireMock mappings or OpenAPI spec for Prism mock server.
QR Code Generator / Reader
Generate QR codes from any text or URL with custom colors and error correction. Decode QR codes from uploaded images — all client-side.
GitHub Actions Builder
Generate a GitHub Actions workflow for Maven or Gradle based Spring Boot apps.
JWT Decoder / Encoder
Decode JWT header and payload, verify HMAC signatures, or build and sign a new token with HS256/384/512 — all client-side.
Spring @Sql Fixture Generator
Generate test SQL fixtures and @DataJpaTest snippets.
Velocity Code Formatter
Format Apache Velocity / VTL templates with directive indentation, spacing cleanup, diagnostics, copy, and download.
cURL ↔ Code Converter
Paste a cURL command and get equivalent Java HttpClient, JavaScript fetch, or Python requests code instantly.
HTTP Status Reference
Every standard HTTP status code with descriptions, developer tips and searchable/filterable interface.
Laravel Factory & Seeder Generator
Generate Laravel Factory and Seeder classes from CREATE TABLE SQL.
Log Formatter
Clean up Spring Boot logs into a readable timeline and grouped stacktrace blocks.
OpenAPI / Swagger Viewer
Paste an OpenAPI 3.0 or Swagger 2.0 spec (JSON/YAML) to browse endpoints, parameters and responses in a clean interface.
Annotation Generator
Generate @Slf4j, @RestController, @RequestBody, @Valid, and CRUD mappings from entity classes or SQL.
JSON to YAML
Convert JSON to YAML with configurable line width.
YAML to JSON
Parse YAML and output formatted JSON.
JSON to CSV
Flatten JSON arrays to CSV.
CSV to JSON
Convert CSV rows to JSON objects.
XML to JSON
Parse XML documents to structured JSON.
JSON to XML
Convert JSON to XML with configurable root tag.
JSON to TypeScript
Infer TypeScript interfaces from JSON samples.
JSON to Zod
Generate Zod validation schemas from JSON.
JSON to Pydantic
Generate Pydantic models for FastAPI from JSON.
JSON Schema Generator
Generate JSON Schema draft 2020-12 from JSON examples.
JSON to Go
Generate Go structs with JSON tags from sample payloads.
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