Jegan - A terminal JSON editor

( English / Japanese )

Features

Edit JSON in a terminal-based interactive UI
Supports not only JSON, but also JSONL and JSON wrapped in JavaScript assignments
(as used in X/Twitter archives)
Minimal diffs on save
Unmodified parts of the document retain their original representation, including whitespace, indentation, key order, literal formatting (e.g. escape sequences), and even trailing non-JSON data.
Only the actual changes you make appear in diffs, making it safe to edit real-world data.
vi-like navigation with Emacs-style editing
Navigate with j/k and scroll horizontally with h/l.
Use o to add items, and r/R to enter edit mode, where Emacs-style key bindings are available.
Works with files and standard input
Open JSON/JSONL files directly or process piped input seamlessly.
Visual feedback for changes
Modified values are highlighted in bold for easy identification.

Download the binary package from Releases and extract the executable.

⚠️ Note: The macOS build is experimental and not yet tested. Please let us know if you encounter any issues!

brew install eget        # Unix-like systems
# or
scoop install eget       # Windows

cd (YOUR-BIN-DIRECTORY)
eget hymkor/jegan

scoop install https://raw.githubusercontent.com/hymkor/jegan/master/jegan.json

scoop bucket add hymkor https://github.com/hymkor/scoop-bucket
scoop install jegan

go install github.com/hymkor/jegan/cmd/jegan@latest

Note: go install places the executable in $HOME/go/bin or $GOPATH/bin, so you need to add this directory to your $PATH to run jegan.

jegan some.json

jegan < some.json

j, ↓, Ctrl-N : Move to the next item
k, ↑, Ctrl-P : Move to the previous item
l, →, Ctrl-F : Scroll the view to the right
h, ←, Ctrl-B : Scroll the view to the left
Space, PageDown : Move to the next page of items
b, PageUp : Move to the previous page of items
< : Move to the first item
> : Move to the last item
o : Insert a new item below the cursor.
- For object items, enter both key and value.
- For array items, enter only the value.
- The key is used as entered (no quotes required).
- The value is interpreted as follows:
  - "..." → string (escape sequences are interpreted)
  - Input that can be parsed as a number → number
  - null → null
  - true / false → boolean
  - {} → empty object
  - [] → empty array
  - Otherwise → string (used as-is)
- Ctrl+G cancels the current input
- Empty input is treated as an empty string ("").
- Duplicate keys in objects are not allowed.
r : Modify the item at the cursor (same input method as o)
R : Modify the item at the cursor (explicitly specify the value type)
d : Delete the item at the cursor
Non-empty objects and arrays cannot be deleted
w : Save to file
q : Quit