Format

Description

Allows you to format dasel output according to the given template.

Usage

Pass the --format flag to select commands.

Available in select commands since v1.18.0.

Functions and accessors

The root context . is equal to the node found at the given selector.

It is recommended that you use the select function with a selector to access values, but you can access properties in the path with .field.subField if preferred.

Function	Description
select "selector"	Returns the node at the given selector.
selectMultiple "selector"	Returns a list of nodes found for the given selector.
query	Alias of select.
queryMultiple	Alias of selectMultiple.
isFirst	Returns true if the node being formatted is the first in a list of selected nodes.
isLast	Returns true if the node being formatted is the last in a list of selected nodes.
format "template"	Allows recursive calls to the formatting capability. Useful when using a selectMultiple.
newline	Returns a newline character.

Dasel also provides access to sprig functions within templates to allow more functionality.

The templates are parsed using golang's text/template package so dasel also supports an array of conditional and loop statements by default.

Description	Example
If condition	{{ if x }} x is true {{ else }} x is false {{ end }}
If not condition	{{ if not x }} x is false {{ else }} x is true {{ end }}
Range	Numbers: {{ range .numbers -}} - {{ . }} {{ end }}
Text and space manipulation	https://pkg.go.dev/text/template#hdr-Text_and_spaces

For more information refer to the related documentation.

Example

Select

$ echo '[
  {"name": "Tom", "email": "[email protected]"},
  {"name": "Jim", "email": "[email protected]"}
]' | dasel -p json -m \
  --format '{{ select ".name" }},{{ select ".email" }}' \
  '.[*]'
Tom,[email protected]
Jim,[email protected]

SelectMultiple

$ echo '[
  {"name": "Tom", "emails": [
    {"email": "[email protected]", "primary": true},
    {"email": "[email protected]", "primary": false}
  ]},
  {"name": "Jim", "emails": [
    {"email": "[email protected]", "primary": false},
    {"email": "[email protected]", "primary": true}
  ]}
]' | dasel -p json -m \
  --format '{{ select ".name" }}:{{ newline }}{{ selectMultiple ".emails.[*]" | format "- {{ select \".email\" }}, {{ select \".primary\" }}{{ if not isLast }}{{ newline }}{{ end }}" }}' \
  '.[*]'
Tom:
- [email protected], true
- [email protected], false
Jim:
- [email protected], false
- [email protected], true