Urbit Docs
  • What is Urbit?
  • Get on Urbit
  • Build on Urbit
    • Contents
    • Environment Setup
    • Hoon School
      • 1. Hoon Syntax
      • 2. Azimuth (Urbit ID)
      • 3. Gates (Functions)
      • 4. Molds (Types)
      • 5. Cores
      • 6. Trees and Addressing
      • 7. Libraries
      • 8. Testing Code
      • 9. Text Processing I
      • 10. Cores and Doors
      • 11. Data Structures
      • 12. Type Checking
      • 13. Conditional Logic
      • 14. Subject-Oriented Programming
      • 15. Text Processing II
      • 16. Functional Programming
      • 17. Text Processing III
      • 18. Generic and Variant Cores
      • 19. Mathematics
    • App School I
      • 1. Arvo
      • 2. The Agent Core
      • 3. Imports and Aliases
      • 4. Lifecycle
      • 5. Cards
      • 6. Pokes
      • 7. Structures and Marks
      • 8. Subscriptions
      • 9. Vanes
      • 10. Scries
      • 11. Failure
      • 12. Next Steps
      • Appendix: Types
    • App School II (Full-Stack)
      • 1. Types
      • 2. Agent
      • 3. JSON
      • 4. Marks
      • 5. Eyre
      • 6. React app setup
      • 7. React app logic
      • 8. Desk and glob
      • 9. Summary
    • Core Academy
      • 1. Evaluating Nock
      • 2. Building Hoon
      • 3. The Core Stack
      • 4. Arvo I: The Main Sequence
      • 5. Arvo II: The Boot Sequence
      • 6. Vere I: u3 and the Serf
      • 7. Vere II: The Loom
      • 8. Vanes I: Behn, Dill, Kahn, Lick
      • 9. Vanes II: Ames
      • 10. Vanes III: Eyre, Iris
      • 11. Vanes IV: Clay
      • 12. Vanes V: Gall and Userspace
      • 13. Vanes VI: Khan, Lick
      • 14. Vanes VII: Jael, Azimuth
    • Runtime
      • U3
      • Conn.c Guide
      • How to Write a Jet
      • API Overview by Prefix
      • C in Urbit
      • Cryptography
      • Land of Nouns
    • Tools
      • Useful Links
      • JS Libraries
        • HTTP API
      • Docs App
        • File Format
        • Index File
        • Suggested Structure
    • Userspace
      • Command-Line App Tutorial
      • Remote Scry
      • Unit Tests
      • Software Distribution
        • Software Distribution Guide
        • Docket File
        • Glob
      • Examples
        • Building a CLI App
        • Debugging Wrapper
        • Host a Website
        • Serving a JS Game
        • Ship Monitoring
        • Styled Text
  • Urbit ID
    • What is Urbit ID?
    • Azimuth Data Flow
    • Life and Rift
    • Urbit HD Wallet
    • Advanced Azimuth Tools
    • Custom Roller Tutorial
    • Azimuth.eth Reference
    • Ecliptic.eth Reference
    • Layer 2
      • L2 Actions
      • L2 Rollers
      • L2 Roller HTTP RPC-API
      • L2 Transaction Format
  • Urbit OS
    • What is Urbit OS?
    • Base
      • Hood
      • Threads
        • Basics Tutorial
          • Bind
          • Fundamentals
          • Input
          • Output
          • Summary
        • HTTP API Guide
        • Spider API Reference
        • Strandio Reference
        • Examples
          • Child Thread
          • Fetch JSON
          • Gall
            • Poke Thread
            • Start Thread
            • Stop Thread
            • Take Facts
            • Take Result
          • Main-loop
          • Poke Agent
          • Scry
          • Take Fact
    • Kernel
      • Arvo
        • Cryptography
        • Move Trace
        • Scries
        • Subscriptions
      • Ames
        • Ames API Reference
        • Ames Cryptography
        • Ames Data Types
        • Ames Scry Reference
      • Behn
        • Behn API Reference
        • Behn Examples
        • Behn Scry Reference
      • Clay
        • Clay API Reference
        • Clay Architecture
        • Clay Data Types
        • Clay Examples
        • Clay Scry Reference
        • Filesystem Hierarchy
        • Marks
          • Mark Examples
          • Using Marks
          • Writing Marks
        • Using Clay
      • Dill
        • Dill API Reference
        • Dill Data Types
        • Dill Scry Reference
      • Eyre
        • EAuth
        • Eyre Data Types
        • Eyre External API
        • Eyre Internal API
        • Eyre Scry Reference
        • Low-Level Eyre Guide
        • Noun channels
      • Gall
        • Gall API Reference
        • Gall Data Types
        • Gall Scry Reference
      • Iris
        • Iris API Reference
        • Iris Data Types
        • Iris Example
      • Jael
        • Jael API Reference
        • Jael Data Types
        • Jael Examples
        • Jael Scry Reference
      • Khan
        • Khan API Reference
        • Khan Data Types
        • Khan Example
      • Lick
        • Lick API Reference
        • Lick Guide
        • Lick Examples
        • Lick Scry Reference
  • Hoon
    • Why Hoon?
    • Advanced Types
    • Arvo
    • Auras
    • Basic Types
    • Cheat Sheet
    • Cryptography
    • Examples
      • ABC Blocks
      • Competitive Programming
      • Emirp
      • Gleichniszahlenreihe
      • Islands
      • Luhn Number
      • Minimum Path Sum
      • Phone Letters
      • Restore IP
      • Rhonda Numbers
      • Roman Numerals
      • Solitaire Cipher
      • Water Towers
    • Generators
    • Hoon Errors
    • Hoon Style Guide
    • Implementing an Aura
    • Irregular forms
    • JSON
    • Limbs and wings
      • Limbs
      • Wings
    • Mips (Maps of Maps)
    • Parsing Text
    • Runes
      • | bar · Cores
      • $ buc · Structures
      • % cen · Calls
      • : col · Cells
      • . dot · Nock
      • / fas · Imports
      • ^ ket · Casts
      • + lus · Arms
      • ; mic · Make
      • ~ sig · Hints
      • = tis · Subject
      • ? wut · Conditionals
      • ! zap · Wild
      • Constants (Atoms and Strings)
      • --, == · Terminators
    • Sail (HTML)
    • Serialization
    • Sets
    • Standard Library
      • 1a: Basic Arithmetic
      • 1b: Tree Addressing
      • 1c: Molds and Mold-Builders
      • 2a: Unit Logic
      • 2b: List Logic
      • 2c: Bit Arithmetic
      • 2d: Bit Logic
      • 2e: Insecure Hashing
      • 2f: Noun Ordering
      • 2g: Unsigned Powers
      • 2h: Set Logic
      • 2i: Map Logic
      • 2j: Jar and Jug Logic
      • 2k: Queue Logic
      • 2l: Container from Container
      • 2m: Container from Noun
      • 2n: Functional Hacks
      • 2o: Normalizing Containers
      • 2p: Serialization
      • 2q: Molds and Mold-Builders
      • 3a: Modular and Signed Ints
      • 3b: Floating Point
      • 3c: Urbit Time
      • 3d: SHA Hash Family
      • 3e: AES encryption (Removed)
      • 3f: Scrambling
      • 3g: Molds and Mold-Builders
      • 4a: Exotic Bases
      • 4b: Text Processing
      • 4c: Tank Printer
      • 4d: Parsing (Tracing)
      • 4e: Parsing (Combinators)
      • 4f: Parsing (Rule-Builders)
      • 4g: Parsing (Outside Caller)
      • 4h: Parsing (ASCII Glyphs)
      • 4i: Parsing (Useful Idioms)
      • 4j: Parsing (Bases and Base Digits)
      • 4k: Atom Printing
      • 4l: Atom Parsing
      • 4m: Formatting Functions
      • 4n: Virtualization
      • 4o: Molds
      • 5a: Compiler Utilities
      • 5b: Macro Expansion
      • 5c: Compiler Backend & Prettyprinter
      • 5d: Parser
      • 5e: Molds and mold builders
      • 5f: Profiling support
    • Strings
    • The Engine Pattern
    • Udon (Markdown-esque)
    • Vases
    • Zuse
      • 2d(1-5): To JSON, Wains
      • 2d(6): From JSON
      • 2d(7): From JSON (unit)
      • 2e(2-3): Print & Parse JSON
      • 2m: Ordered Maps
  • Nock
    • What is Nock?
    • Decrement
    • Definition
    • Fast Hints and Jets
    • Implementations
    • Specification
  • User Manual
    • Contents
    • Running Urbit
      • Cloud Hosting
      • Home Servers
      • Runtime Reference
      • Self-hosting S3 Storage with MinIO
    • Urbit ID
      • Bridge Troubleshooting
      • Creating an Invite Pool
      • Get an Urbit ID
      • Guide to Factory Resets
      • HD Wallet (Master Ticket)
      • Layer 2 for planets
      • Layer 2 for stars
      • Proxies
      • Using Bridge
    • Urbit OS
      • Basics
      • Configuring S3 Storage
      • Dojo Tools
      • Filesystem
      • Shell
      • Ship Troubleshooting
      • Star and Galaxy Operations
      • Updates
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  1. Build on Urbit
  2. App School I

12. Next Steps

We've now covered all the arms of a Gall agent, and everything you need to know to start writing your own agent.

The things haven't touched on yet are front-end development and integration, Eyre's HTTP API for communicating with agents from the web, and dealing with JSON data. The Full-stack Walkthrough covers these aspects of Urbit app development, and it also puts into practice many of the concepts we've discussed in this guide, so you might like to work through that next. In addition to that walkthrough, you can refer to the following documents for help writing a web front-end for your app:

  • Eyre's external API reference - This explains Eyre's HTTP API, through which a browser or other HTTP client can interact with a Gall agent.

  • Eyre's usage guide - This walks through examples of using Eyre's HTTP API.

  • JSON guide - This walks through the basics of converting Hoon data structures to JSON, for use with a web client. It also covers JSON conversion methods in mark files.

  • Zuse reference - This contains documentation of all JSON encoding and decoding functions included in the /sys/zuse.hoon utility library.

  • The software distribution guide - This covers everything you need to know to distribute apps to other ships. It includes details of bundling a web front-end and serving it to the user in the browser.

  • The HTTP API guide - This is a reference and guide to using the @urbit/http-api NPM module.

  • The Sail guide - Sail is a domain-specific language for composing XML structure in Hoon. It can be used to compose front-ends for Urbit apps directly in agents, as an alternative approach to having a separate Javascript app.

In addition to these documents about creating a web-based user interface for your app, there are some other guides you might like to have a look at:

  • Threads guide - Threads are like transient agents, typically used for handling complex I/O functionality for Gall agents - like interacting with an external HTTP API.

  • The software distribution guide - This explains how to set up a desk for distribution, so other people can install your app.

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