JSON ↔ YAML Converter

About the JSON ↔ YAML Converter

Convert between JSON and YAML in both directions. JSON to YAML writes block-style YAML with two-space indentation; YAML to JSON parses the YAML and prints formatted JSON. Use Download to save the result.

If a YAML file contains several documents separated by ---, the first one is converted and a note says how many were found.

How to use it

1. Choose JSON to YAML or YAML to JSON.
2. Paste your data, or press Sample Data.
3. Read any error or note, then Copy Output or Download the result.

Worked example

JSON to YAML direction.

{"name":"api","ports":[80,443],"debug":false}

name: api
ports:
  - 80
  - 443
debug: false

Common mistakes and gotchas

• When writing YAML, strings such as yes, no, on and off are quoted (YAML 1.1 compatibility) so an older parser does not turn them into booleans; check how your own YAML parser treats them.
• Numbers are normalised: 1.10 becomes the number 1.1 and 010 is read as decimal 10, so quote values you need to keep exactly as written.
• Dates such as 2020-01-01 stay as strings, since JSON has no date type.
• YAML comments and anchors have no JSON equivalent; comments are dropped when converting to JSON and anchors are expanded.

Frequently asked questions