krastanov/julia-yaml

Julia YAML

Use YAML.jl to load YAML documents into Julia types and emit Julia data as YAML.

Load YAML Documents

Single-document parse:

import YAML
obj = YAML.load(yaml_string)
obj2 = YAML.load_file("config.yml")

Multi-document parse:

docs = YAML.load_all(yaml_string)
docs2 = YAML.load_all_file("multi.yml")

Control Dictionary Type

By default, mappings parse as Dict{Any,Any}. Pass dicttype to control output:

YAML.load_file("a.yml"; dicttype=Dict{Symbol,Any})
YAML.load_file("a.yml"; dicttype=OrderedDict{String,Any})
YAML.load_file("a.yml"; dicttype=()->DefaultDict{String,Any}(missing))

Use OrderedDict when key order should be preserved from source YAML.

Write YAML

Emit to string/IO or file:

yaml_text = YAML.write(data)
YAML.write_file("out.yml", data)

When round-tripping, verify semantic structure, not exact formatting (layout/quoting style may differ).

YAML Semantics Notes

• Anchors and references are supported per package README behavior.
• Numeric and timestamp-like scalars are parsed into Julia values according to YAML.jl rules.
• Keep current package limitations in mind when relying on advanced YAML features.

Reference

• references/yaml-api-patterns.md - load/dump APIs, dicttype, and caveats

Related Skills

• julia-toml - analogous workflow for TOML data
• julia-package-dev - package workflows where YAML may appear in tooling/config