Question 1

How do I parse a YAML file in Node.js with JS-YAML?

Accepted Answer

Use the `yaml.load()` method for single documents or `yaml.loadAll()` for multi-document sources. For example, `const doc = yaml.load(fs.readFileSync('file.yml', 'utf8'))` reads and parses the file, throwing exceptions on errors for robust handling.

Question 2

What's the difference between JS-YAML and the 'yaml' npm package?

Accepted Answer

JS-YAML is a mature, spec-compliant parser focused on full YAML 1.2 support and performance, with a CLI tool and extensive customization. The 'yaml' package might offer a different API or lighter weight, but JS-YAML is often preferred for its reliability and feature set in production environments.

Question 3

How can I customize the output format when dumping YAML?

Accepted Answer

Use the `dump()` method with options like `indent`, `sortKeys`, and `styles`. For instance, `yaml.dump(obj, { indent: 4, sortKeys: true })` produces nicely formatted YAML with sorted keys, and you can adjust styles for specific tags as shown in the documentation.

Question 4

Does JS-YAML work in the browser?

Accepted Answer

Yes, JS-YAML can be used in browser environments as it's a JavaScript library. You need to include it via a bundler or CDN, and the online demo demonstrates its functionality for web-based YAML processing without server-side dependencies.

Question 5

How to handle errors when loading invalid YAML?

Accepted Answer

JS-YAML throws `YAMLException` on errors, so use try-catch blocks. Additionally, the `onWarning` option allows custom handling of warnings, and the CLI tool provides detailed error messages with the `-t` flag for stack traces during debugging.

Question 6

What schemas should I use for different use cases?

Accepted Answer

Use `JSON_SCHEMA` for JSON compatibility, `DEFAULT_SCHEMA` for full YAML type support, or `FAILSAFE_SCHEMA` for minimal, safe parsing. Choose based on whether you need to handle YAML-specific types like timestamps or binary data, as outlined in the API documentation.

js-yaml

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