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Runs locally
$ devdesk yaml--local
Format & documents

YAML to JSON converter for configuration files

Convert YAML and JSON locally. Check indentation, data types and large integer limits with configuration examples and practical troubleshooting.

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How to use

Choose the input format and convert. YAML alias expansion is bounded. JSON numbers outside JavaScript’s safe integer range are rejected to avoid precision loss.

Your input stays yours

Step by step

  1. Paste the configuration and check that YAML indentation uses spaces.
  2. Choose YAML → JSON or JSON → YAML to match the input.
  3. Compare values and types before copying the result into a configuration file.

Configuration example: keep a version as text

service: api
version: "1.0"
enabled: true
ports:
  - 8080
  - 8081

version should remain the string "1.0", enabled a boolean and ports an array. Conversion preserves data structure, not comments or original layout.

Frequently asked questions

Why did comments disappear?

JSON has no comment syntax. The converter parses data and emits it again, without preserving YAML comments, quote styles or anchor notation. Keep the original configuration.

Why are large integers rejected?

Integers outside JavaScript’s safe range are rejected to avoid silent rounding. Represent identifiers as strings when the API contract allows it. Use the JSON formatter to inspect original JSON number text.

Does it support every YAML type?

Prefer JSON-compatible structures: string keys, scalars, arrays and objects. Review complex keys, custom tags and anchor-dependent configuration separately. Alias expansion is bounded to limit oversized results.

References

Practical guides

All guides
YAML

YAML to JSON type changes: quotes, comments and large integers

Round-trip configuration values to inspect strings, booleans, arrays and indentation. Understand lost comments and rejected large integers beyond formatting.

Read guide JSON

JSON large integer precision: find and prevent lost digits

Reproduce lost digits with 9007199254740993, compare raw JSON with parsed values, and learn when to use string IDs or BigInt.

Read guide

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