how to convert yaml to json

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The basic mapping

YAML and JSON represent the same data but solve different problems. YAML is human-friendly (Kubernetes manifests, CI configs, Docker Compose). JSON is machine-friendly (APIs, tokens, logs). Converting between them sounds trivial but has gotchas: YAML is a superset of JSON, but YAML features like anchors, multi-line strings, and implicit typing don’t survive a round-trip without care. This guide covers the conversion rules, YAML features that need attention, numeric precision, comments, anchors/aliases, round-tripping, and when to use which format.

Implicit typing — the Norway problem

YAML 1.2 is a strict superset of JSON, so any valid JSON is valid YAML. Going the other way drops features. Core mappings:

Numbers and precision

The conversion of structure is mechanical. The interesting part is the scalars.

Multi-line strings

YAML has several multi-line styles, all collapse to JSON string with escaped newlines:

Comments disappear

JSON has no comments. Every YAML comment is lost in conversion. If comments matter (Kubernetes manifests are heavily commented), either keep the YAML source of truth or use JSON with a comment-preserving extension like JSON5 / JSONC.

Anchors and aliases

YAML supports references to repeated content:

Keys can be any type in YAML

JSON has no anchors — converters expand them, producing duplicated objects. If you go back to YAML, you’ll have lost the shared reference and doubled file size on large configs.

Choosing parsers

YAML allows non-string keys:

When to use YAML vs JSON

YAML → JSON → YAML isn’t lossless. You lose:

Round-tripping

Comments.

Validating output

Original scalar styles (quoted vs plain vs block).

Common mistakes

Anchor/alias references (expanded).

Run the numbers

Non-string keys (stringified).