The High Code Framework (low-code for devs), a flexible data modeling & code generation system
Built to generate anything, works on directories of files for input / output. CUE is the primary input, which means JSON & Yaml are also supported. It also supports writing custom code in the output, changing your designs and regenerating, while not losing the custom parts.
Generic templating tool with support of JSON, YAML and TOML data
I'm not sure if it fits your description, but a while ago me and my associate made https://github.com/link-society/gotempl
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Ask HN: Are there AST aware templating programs / snippets?
1 project | news.ycombinator.com | 11 Feb 2022
Tgen: A template tool a la Helm or Consul Templates
4 projects | news.ycombinator.com | 3 Sep 2021
Why isn't there a code generator for web development yet?
1 project | news.ycombinator.com | 2 Jan 2021
GO Boilerplate templates
4 projects | reddit.com/r/golang | 3 Jun 2022
Building Rich CLI Applications with Go's Built-in Templating
2 projects | reddit.com/r/golang | 9 Mar 2022