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Quickstart

Install

$ uv tool install jinja2-cli
# or
$ pip install jinja2-cli

Render from a data file

$ jinja2 template.j2 data.json --format json

Render from stdin

$ cat data.json | jinja2 template.j2 - --format json

Inline variables

$ jinja2 template.j2 data.json --format json -D foo=bar -D answer=42

Auto format

  • If a data file is provided, --format auto (default) uses the file extension.
  • If stdin is used, it defaults to YAML when available, otherwise JSON.