DevToolsHub

YAML to JSON / JSON to YAML

Switch between human-friendly YAML configs and strict JSON for validators, CI, and Kubernetes tooling.

Never parse untrusted YAML with parsers that allow arbitrary object construction.

How to use

  1. YAML to JSON: Paste YAML in the input area. JSON appears below; use Copy or Download.
  2. JSON to YAML: Paste JSON in the input area. YAML appears below; use Copy or Download.
  3. Use Share URL to copy a link that restores your input and mode.
  4. Use Download to save as .json or .yaml.

1YAML prioritizes human authors

Significant indentation and optional quotes make YAML pleasant for hand-edited configuration, but those same features create edge cases parsers must handle carefully.

JSON is strict and unambiguous, which is why many tools internally normalize YAML to JSON before applying schema validation.

  • Be explicit about numbers versus strings in YAML (for example zip codes) to avoid accidental octal parsing in older parsers.
  • Anchors and aliases reduce duplication in large configs; converting to JSON expands those references into concrete structures.

2Kubernetes, CI, and app settings

Many teams author Kubernetes manifests in YAML even when the control plane stores equivalent JSON because review diffs stay readable.

CI pipelines sometimes emit JSON logs; converting to YAML snippets can make excerpts easier to embed in incident reports—pick the format your audience reads fastest.

3Safety tips

Never load untrusted YAML with a parser that enables arbitrary object construction; that path historically enabled remote code execution in several languages.

Treat YAML files in repos like code: review changes, pin versions, and validate against schemas where possible.

4Kubernetes and CI configuration

Many teams author YAML for readability and convert to JSON for tools that only accept JSON. Anchors reduce duplication but can confuse reviewers—use sparingly in shared repos.

5Security of YAML parsers

Never parse untrusted YAML with loaders that construct arbitrary objects. Stick to safe loaders in production code; use this browser tool only with non-sensitive configs.

6Quick checklist for YAML ↔ JSON

Treat ambiguous scalars (yes/no, leading zeros) explicitly in YAML. Validate against a schema after converting to JSON for Kubernetes or CI configs.

  • Avoid loading untrusted YAML with unsafe parsers.
  • Keep anchors readable—over-nesting hurts reviewability.

Examples

Simple config

YAML readability converts to JSON for tools that require JSON.

server:
  port: 8080
  host: 0.0.0.0

Quote ambiguous scalars

Zip codes and IDs should be quoted in YAML.

zip: "02101"
id: "00123"

Frequently asked questions

Why did YAML to JSON change my numbers?
YAML may interpret unquoted values specially (leading zeros, yes/no). Quote scalars when types matter.
Are YAML anchors preserved in JSON?
Conversion expands anchors into concrete JSON structures. Duplicate keys in YAML may error or overwrite per parser rules.
Can I convert Kubernetes manifests?
Yes for inspection and editing, but validate with kubectl and cluster policies before applying.
Is untrusted YAML safe to paste?
Use only with configs you trust. Malicious YAML has exploited unsafe loaders in some languages—this is a browser utility, not a sandbox.
Does JSON to YAML lose information?
JSON is a subset of YAML data models for typical configs. Comments and anchors are YAML-only features added when writing YAML output.

Related tools & guides