json_view: Collapsible viewer for R list-like data

In termr: Modern Reactive Terminal Applications with Data Workflows

Collapsible viewer for R list-like data

Description

Displays already-parsed R objects as a tree_view(). Named lists and data frames are objects; unnamed lists and vectors are arrays. Children are created when a node is expanded. At most page_size children are created per page; a ⁠Load next ...⁠ node exposes the next page. Character scalars are quoted, logical values use lowercase JSON spelling, NULL is shown as null, and R NA is shown as NA to keep it distinct from JSON null. Set parse = TRUE for JSON text when optional package jsonlite is installed; this is a convenience over the primary R-object interface.

Usage

json_view(
  x,
  parse = FALSE,
  page_size = 100L,
  id = NULL,
  classes = NULL,
  style = NULL,
  disabled = FALSE
)

Arguments

x	An R object, or one JSON string when parse = TRUE.
parse	Parse a JSON character string with optional jsonlite?
page_size	Maximum children created when a tree node is expanded.
id	Optional identifier.
classes	Optional classes.
style	A style().
disabled	Disable focus and tree interaction?

Value

A TreeView with lazily loaded object/array children.

Examples

json_view(list(user = list(id = 42, name = "Alice"), active = TRUE))

termr documentation built on Oct. 21, 2026, 5:13 p.m.