Full-Stack Developer · Canoas, RS, Brazil

Juliano Ballarini

Full-stack developer. I build scalable systems for companies and provide free web tools for anyone working with JSON, SQL, Markdown, and technical documentation.

If you need to format JSON or SQL online, use an in-browser Markdown editor, or hire a developer for integrations and APIs, this is Juliano Ballarini's official hub.

Use free tools Hire for projects

Free tools for developers

Public web utilities to format JSON and SQL, edit Markdown, and speed up daily work with APIs, databases, documentation, and integrations — no login and no data sent to the server.

Format, validate, and minify JSON in the browser — captura de tela

JSON Formatter

Format, validate, and minify JSON in the browser

Free, local, offline tool to paste, edit, validate, format, and compact JSON — with Monaco Editor (same engine as VS Code). Ideal for integrations, webhooks, and API payloads.

  • JSON validation with line-level error highlighting
  • One-click formatting and minification
  • 100% local processing, no data sent to servers
  • Works offline after the page loads

Best for: Developers, DevOps, and integrators working with REST APIs, webhooks, and JSON payloads.

Monaco Editor Offline Validation Minify JSON
Open tool
Code on GitHub
Format, validate, and minify SQL in the browser — captura de tela

SQL Formatter

Format, validate, and minify SQL in the browser

Free, local, offline tool to paste, edit, validate, format, and minify SQL — with Monaco Editor and support for PostgreSQL, MySQL, SQL Server, SQLite, and more dialects.

  • Syntactic validation with line-level error highlighting
  • Formatting and minification with multiple dialects
  • 100% local processing, no data sent to servers
  • Works offline after the page loads

Best for: Developers, DBAs, and data analysts working with SQL queries and relational databases.

Monaco Editor Offline PostgreSQL MySQL SQL Server
Open tool
Code on GitHub
Markdown editor and viewer with real-time preview — captura de tela

Markdown Editor

Markdown editor and viewer with real-time preview

In-browser Markdown editor and viewer with real-time preview, Mermaid diagrams, keyboard shortcuts, and .md file support — no installation required.

  • Real-time preview with HTML sanitization
  • Mermaid diagrams and GFM tables
  • Separate editor and viewer for editing or reading
  • Open, edit, and save .md files locally

Best for: Developers, technical writers, and teams producing READMEs, specs, and documentation.

Markdown Mermaid Preview Documentation
Open tool Viewer
Code on GitHub

Services for companies and tech teams

Beyond public tools, Juliano Ballarini works on software projects for organizations that need reliable integrations, REST APIs, and custom web systems — remote worldwide.

Integrations and REST APIs

Development and maintenance of integrations between ERPs, e-commerce, backoffice, and external services — focused on reliability, logging, and error handling.

Web systems and backoffice

Full-stack applications with .NET, Blazor, Node.js, and React, including admin panels, automations, and business workflows.

Automation and productivity

Scripts, pipelines, and internal tools that reduce manual work, speed up deploys, and improve development team operations.

Featured projects

Some of the projects I am currently working on.

BallaPDF

PDF/A-4f generator with compliance and veraPDF verification.

Python · FastAPI · PostgreSQL

Perseus Hub

Backoffice integration system for educational institutions.

.NET 9 · Blazor · SQL Server

Legado em Movimento

Social system for wheelchair lending.

Node.js · Express · React

Stack and technical skills

Technologies used in real integration, backoffice, API, and automation projects — relevant for companies looking for a full-stack developer with hands-on experience.

  • .NET / C#
  • Node.js
  • Python
  • FastAPI
  • PHP
  • React
  • Blazor
  • SQL Server
  • PostgreSQL
  • REST APIs
  • Docker

Frequently asked questions

Clear answers about the tools, professional profile, and how to get in touch — useful for developers, companies, and generative search engines.

Who is Juliano Ballarini?

Juliano Ballarini is a Brazilian full-stack developer based in Canoas/RS, with experience in integrations, REST APIs, automation, .NET, Node.js, Python, FastAPI, React, and SQL Server. He serves clients worldwide remotely. This site brings together his professional portfolio and public web tools.

How can I format JSON online for free?

Use the JSON Formatter at https://ballarini.com.br/juliano/json-formatter/. The tool validates, formats, and minifies JSON directly in your browser, with no login and no data sent to external servers.

Does the JSON Formatter work offline?

Yes. After the first load, the JSON Formatter can be used offline because Monaco Editor is served locally. All processing happens in the user's browser.

How can I format SQL online for free?

Use the SQL Formatter at https://ballarini.com.br/juliano/sql-formatter/. The tool validates, formats, and minifies SQL directly in your browser, with support for PostgreSQL, MySQL, SQL Server, and other dialects — no login and no data sent to external servers.

Does the SQL Formatter work offline?

Yes. After the first load, the SQL Formatter works offline because Monaco Editor and the SQL formatter library are served locally. All processing happens in the browser.

Which SQL dialects are supported?

The SQL Formatter supports ANSI SQL, PostgreSQL, MySQL, MariaDB, SQLite, Transact-SQL, PL/SQL, Snowflake, BigQuery, Spark, Trino, and Redshift. Select the dialect in settings for correct formatting.

Is there an online Markdown editor on this site?

Yes. The Markdown Editor at https://ballarini.com.br/juliano/markdown-editor/editor.html lets you edit .md files with real-time preview, Mermaid diagrams, and keyboard shortcuts. There is also a viewer at https://ballarini.com.br/juliano/markdown-editor/viewer.html.

What services does Juliano Ballarini offer to companies?

Juliano works on system integrations, REST APIs, backoffice, automation, and full-stack web applications. He serves companies in any country, connecting ERPs, e-commerce, educational institutions, or internal services with reliable APIs.

What technologies does Juliano Ballarini specialize in?

His main technologies include .NET/C#, Node.js, Python, FastAPI, PHP, React, Blazor, SQL Server, PostgreSQL, REST APIs, Docker, and client-side web tool development.

How can I hire Juliano Ballarini for a project?

Companies and teams can reach out via LinkedIn at https://www.linkedin.com/in/jsballarini/ or GitHub at https://github.com/jsballarini to discuss integrations, APIs, web systems, and automation.

Hire or collaborate

Available for integration projects, REST APIs, web systems, automation, and technical consulting — remote, for clients in any country. Developers can also follow new open-source tools on GitHub.

LinkedIn — hiring and networking /in/jsballarini GitHub — code and open-source tools @jsballarini