Built-in modules

require serves two kinds of module, and import serves the same two in JavaScript and TypeScript. Installed libraries are plugins. Built-in modules come with every interpreter under the internal. prefix and need nothing installed. A plugin cannot claim a namespace starting with internal..

The examples are in Lua. JavaScript and TypeScript use the same names through import, such as import log from "internal.logging".

Module	Functions
internal.logging	debug, info, warn, error, each (message[, fields])
internal.time	now(), to_iso8601(ms), from_iso8601(text)
internal.tids	create(), to_tid(ms), from_tid(tid)
internal.json	encode(value), decode(text), and in Lua only to_array(table)
internal.async	Lua only: all(f1, f2, ...)

internal.logging

local log = require("internal.logging")
log.debug(message[, fields])
log.info(message[, fields])
log.warn(message[, fields])
log.error(message[, fields])

fields is a table stored as JSON on the event, so log.error("save failed", { uri = uri, err = tostring(err) }) is queryable rather than a stringified blob. info, warn and error are recorded as script.log events in the event log, carrying the trigger id and caller; debug writes only to the process log. In a job script, info, warn and error also write to that job’s own log.

In JavaScript and TypeScript, console.log, info, debug, warn and error write through internal.logging at the matching level, with console.log at info.

internal.time

local time = require("internal.time")
time.now()                       -- unix milliseconds, integer
time.to_iso8601(ms)              -- "2026-09-13T15:04:05.000Z", raises on an out-of-range timestamp
time.from_iso8601(string)        -- unix milliseconds, or nil on an unparseable string

time.to_iso8601(time.now()) is the current UTC timestamp for a createdAt field.

internal.tids

local tids = require("internal.tids")
tids.create()            -- a fresh TID for now
tids.to_tid(ms)          -- TID for a unix-millisecond timestamp
tids.from_tid(tid)       -- unix milliseconds, raises on an invalid TID

A TID is atproto’s 13-character sortable record key. tids.create() is the rkey to use when a script needs to name a record before writing it.

internal.json

local json = require("internal.json")
json.encode(value)       -- Lua value -> JSON string
json.decode(string)      -- JSON string -> Lua value
json.to_array(table)     -- marks a table as a JSON array, so an empty one encodes as [] rather than {}

Encoding rules and examples: JSON. to_array exists only in Lua, because a Lua table can’t say on its own whether it’s an empty array or an empty object.

internal.async

Lua only. A library call blocks until it answers, so all is how a Lua script runs several at once. It takes functions and returns each function’s first value, in argument order. JavaScript and TypeScript use Promise.all instead.

local async = require("internal.async")
local posts, profile = async.all(
  function() return db.records("app.example.post"):limit(10):run() end,
  function() return http.get("https://example.com/" .. input.did) end
)

Next steps

• The script contract: handle(input, ctx) and what ctx carries
• Libraries: the happyview.* modules, reached the same way via require