ZELTHRSTUDIO

Let us"Build Online Brands"with our expert team

We design and develop high-performance websites and applications to elevate your brand image and drive business growth in the digital era.

Contact NowView our work

Services

What we do

Everything your business needs to go digital — designed, built, and maintained by one team.

Websites & Web Apps

High-performance websites and custom web applications built to turn visitors into loyal customers.

  • Landing pages & company websites
  • E-commerce & booking systems
  • Admin dashboards & CRMs
  • Headless CMS & API integration

REST API

Robust REST APIs that power your web, mobile, and third-party integrations — secure, documented, and fast.

  • API design & architecture
  • Authentication & security
  • API documentation
  • Third-party integrations

Performance & SEO

We tune your existing site to load faster, rank higher, and convert more visitors.

  • Speed & Core Web Vitals audits
  • Technical SEO fixes
  • Conversion rate optimization
  • Ongoing monitoring

Timeline

All our works

Open-source tools we design, build, and ship for the Node.js ecosystem.

Open Source Library

A QR code generation and scanning library for web and Node.js, with built-in PromptPay support.

Open Source Library

TrueMoney gift-code redemption and Thai bank-slip verification for Node.js, with PromptPay QR decode and slip-check built in.

Open Source Library

A simple, flexible HTTP/1.1 and HTTP/2 request client for Node.js — promises, cookies, form-data, redirects, retry, and pagination built in.

Portfolio

Selected projects

Open-source tools we design, build, and ship for the Node.js ecosystem.

@zelthrStudio/qrcode

A QR code generation and scanning library for web and Node.js, with built-in PromptPay support.

#JavaScript#QR
Aug 15, 2026 · 20:58

@zelthrStudio/topup

TrueMoney gift-code redemption and Thai bank-slip verification for Node.js, with PromptPay QR decode and slip-check built in.

#TypeScript#PromptPay
Aug 15, 2026 · 17:39

@zelthrStudio/request

A simple, flexible HTTP/1.1 and HTTP/2 request client for Node.js — promises, cookies, form-data, redirects, retry, and pagination built in.

#Node.js#HTTP/2
Aug 15, 2026 · 17:36

Our Team

The person behind the studio

A one-person studio with big standards — every detail reviewed and shipped by hand.

Follow on GitHub

ByteInDev

Founder & Lead Developer

Designing and building open-source tools and production systems end-to-end — from API architecture to frontend interfaces.

Node.jsTypeScriptOpen Source

Contact

Let's build something great

Have a project in mind? Or just want to say hi — send us a message and we'll get back to you as soon as possible.

Emailhello@zelthr.restGitHubgithub.com/ByteInDevDiscorddiscord.gg/UQuwAgSvmG