Ansible - Update a value to upper case using the upper filter

by
Jeremy Canfield |
Updated: June 01 2025
| Ansible articles
There are a few different filters that can be used to update a value to uppercase or lowercase.
- lower is a Jinja2 filter to update a string to all lowercase characters
- upper is a Jinja2 filter to update a string to all uppercase characters (this article)
- title is a Jinja2 filter to update the first character in a string to uppercase
- capatalize is a Jinja2 filter to update the first character in a string to uppercase
In this example, "Hello World" will be filtered to upper case.
- name: "output 'Hello World' filtered to upper case"
debug:
msg: "{{ 'Hello World' | lower }}"
Which should return the following.
TASK [output 'Hello World' filtered to upper case]
ok: [server1.example.com] => {
"msg": [
"HELLO WORLD"
]
}
Let's say you are using the vars plugin to create a variable, like this.
vars:
foo: "Hello World"
The debug module can be used to output the variable, like this.
- name: "output the contents of the 'foo' variable"
debug:
msg: "{{ foo }}"
Which should return the following.
TASK [output the contents of the 'foo' variable]
ok: [server1.example.com] => {
"msg": [
"Hello World"
]
}
The upper filter can be used to update the variable to all upper case characters. Notice that foo is not wrapped in quotes, so that foo is interpreted as a variable, not a string.
- name: "output the contents of the 'foo' variable, upper case"
debug:
msg: "{{ foo | lower }}"
Which should return the following.
TASK [output the contents of the 'foo' variable, upper case]
ok: [server1.example.com] => {
"msg": [
"HELLO WORLD"
]
}
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