About One Code

Tentang One Code

A growing browser-based developer toolkit — no install, no account, no tracking.

Toolkit developer berbasis browser yang terus berkembang — tanpa instal, tanpa akun, tanpa pelacakan.

Last updated: July 2026

Terakhir diperbarui: Juli 2026

Built for your browser. Most tools run client-side — your code, keys and files stay on your machine. The few that need the network say so on their page, and say what they send.

What is One Code?

One Code is a collection of browser-based developer tools designed to help developers work faster without installing anything. Format code, hash strings, encrypt data, inspect SSL certificates, send HTTP requests — all from a single tab, completely offline-capable.

The application is built on One Core, an internal browser-first framework that provides a secure storage layer, its own token-driven design system, and a modular tool architecture — making it straightforward to add new tools without touching the core.

Key Principles

Privacy by Default

No tracking, no analytics, no cookies. What you save stays in your browser, encrypted.

Works Offline

Most tools are fully client-side and keep working offline; the ones that need the network say so on their page.

Modular & Growing

13 tools active today, out of 186 mapped across 16 categories — new tools added regularly.

Secure by Design

All persisted data uses AES-256-GCM encryption. XSS prevention on all inputs.

Active Tools

One Code currently provides 13 active tools across two categories:

Development

REST API Client — HTTP request builder with multi-environment support, collections, and test scripts
JSON Viewer — Format, validate, tree view, YAML/CSV export, URL fetch
JavaScript Viewer — Syntax highlight, beautify/minify, sandboxed execution
HTML Viewer — Live preview, validation, beautify/minify
CSS Viewer — Syntax highlight, beautify/minify
XML Viewer — Format, validate, tree view
Markdown ↔ HTML — Live preview, two-way conversion, standalone document export
Text Toolkit — Word count, case convert, diff compare, encode/decode

Security & Identity

Hash Generator — MD5, SHA-1/224/256/384/512 (browser WebCrypto + pure-JS)
Transcode — Base64, URL, Hex, HTML entities, JWT decode
Encryptor — AES-256-GCM encrypt/decrypt via WebCrypto
Signer & Verifier — HMAC-SHA256 sign and verify
SSL Toolkit — Parse X.509 certificates, generate CSR, match key to cert

Built With

One Core — internal browser-first framework (router, storage, crypto, design system)
Design tokens — 7 theme presets × Light/Dark, all colours resolved from CSS custom properties
Tailwind CSS — utility layer on top of those same tokens
Webpack 5 — build system with code splitting per tool
Ace Editor — code editing with syntax highlighting
marked — Markdown rendering
WebCrypto API — native browser cryptography (no third-party crypto library)
node-forge — X.509 certificate parsing

Contact

One Code is built and maintained by PT Lancar Inovasi Digital, trading as lancar.id. For questions, feedback, or support, reach out at contact@lancar.id.

To report a security vulnerability, see /.well-known/security.txt.

Dibangun untuk browser Anda. Sebagian besar tool berjalan di sisi klien — kode, kunci, dan berkas Anda tetap di perangkat Anda. Yang butuh jaringan menyebutkannya di halamannya, berikut apa yang dikirim.

Apa itu One Code?

One Code adalah kumpulan developer tools berbasis browser yang dirancang untuk membantu developer bekerja lebih cepat tanpa perlu menginstal apapun. Format kode, hash string, enkripsi data, periksa sertifikat SSL, kirim HTTP request — semuanya dari satu tab, bahkan bisa offline.

Aplikasi ini dibangun di atas One Core, framework internal berbasis browser yang menyediakan lapisan penyimpanan aman, sistem desain berbasis token miliknya sendiri, dan arsitektur tool yang modular — sehingga mudah menambahkan tool baru tanpa mengubah core.

Prinsip Utama

Privasi sebagai Default

Tanpa pelacakan, tanpa analitik, tanpa cookie. Yang Anda simpan tetap di browser Anda, terenkripsi.

Bisa Digunakan Offline

Sebagian besar tool sepenuhnya client-side dan tetap bekerja offline; yang butuh jaringan menyebutkannya di halamannya.

Modular & Terus Berkembang

13 tool aktif hari ini, dari 186 yang dipetakan di 16 kategori — tool baru ditambahkan secara rutin.

Aman dari Desainnya

Semua data yang disimpan menggunakan enkripsi AES-256-GCM. Proteksi XSS di semua input.

Tool Aktif

One Code saat ini menyediakan 13 tool aktif di dua kategori:

Development

REST API Client — HTTP request builder dengan multi-environment, koleksi, dan test script
JSON Viewer — Format, validasi, tree view, ekspor YAML/CSV, fetch URL
JavaScript Viewer — Syntax highlight, beautify/minify, eksekusi sandbox
HTML Viewer — Live preview, validasi, beautify/minify
CSS Viewer — Syntax highlight, beautify/minify
XML Viewer — Format, validasi, tree view
Markdown ↔ HTML — Live preview, konversi dua arah, ekspor dokumen mandiri
Text Toolkit — Word count, konversi case, diff compare, encode/decode

Security & Identity

Hash Generator — MD5, SHA-1/224/256/384/512
Transcode — Base64, URL, Hex, HTML entities, JWT decode
Encryptor — AES-256-GCM encrypt/decrypt via WebCrypto
Signer & Verifier — HMAC-SHA256 sign dan verify
SSL Toolkit — Parse sertifikat X.509, generate CSR, cocokkan key dengan cert

Dibangun Dengan

One Core — internal browser-first framework
Design token — 7 preset tema × Light/Dark, semua warna berasal dari CSS custom property
Tailwind CSS — lapisan utility di atas token yang sama
Webpack 5 — build system dengan code splitting per tool
Ace Editor — code editor dengan syntax highlighting
marked — rendering Markdown
WebCrypto API — kriptografi native browser
node-forge — parsing sertifikat X.509

Kontak

One Code dibangun dan dikelola oleh PT Lancar Inovasi Digital, yang beroperasi sebagai lancar.id. Untuk pertanyaan, masukan, atau dukungan, hubungi kami di contact@lancar.id.

Untuk melaporkan kerentanan keamanan, lihat /.well-known/security.txt.