Can it convert YAML to JSON?

Yes — use YAML → JSON mode to convert any valid YAML document to its JSON equivalent.

Why does YAML not allow tabs?

The YAML specification forbids tab characters for indentation. Only spaces are valid. This is a common source of errors when editing YAML in certain text editors.

What is the difference between YAML and JSON?

YAML is a superset of JSON and is designed for human readability. It supports comments, multi-line strings, anchors and aliases, and does not require quotes for strings in most cases.

Can I use this for Kubernetes manifests?

Yes — Kubernetes YAML files follow standard YAML syntax. Paste your manifest to validate it and check for indentation errors before applying it.

Does it support YAML anchors and aliases?

Yes — YAML anchors (&name) and aliases (*name) are parsed and resolved correctly.

YAML Formatter — Format and validate YAML documents

About YAML Formatter

The YAML Formatter validates and formats YAML documents, and converts YAML to JSON. Paste your YAML to check for syntax errors including indentation mistakes, tab characters (not allowed in YAML), duplicate keys, and type issues.

YAML is widely used in configuration files for Docker Compose, Kubernetes, GitHub Actions, Ansible, Helm charts, Travis CI, and many other DevOps and developer tools. Even small indentation errors cause YAML to fail silently or behave unexpectedly.

Everything runs in your browser. Your data never leaves your device.

How to Use YAML Formatter

Paste your YAML into the input.
Choose Format (normalize indentation) or Convert to JSON.
Errors are highlighted with line numbers.
Copy the formatted or converted result.

Examples

Example — YAML → JSON

Input

name: Alice
age: 30
active: true

Output

{"name":"Alice","age":30,"active":true}

Frequently Asked Questions

Can it convert YAML to JSON?: Yes — use YAML → JSON mode to convert any valid YAML document to its JSON equivalent.
Why does YAML not allow tabs?: The YAML specification forbids tab characters for indentation. Only spaces are valid. This is a common source of errors when editing YAML in certain text editors.
What is the difference between YAML and JSON?: YAML is a superset of JSON and is designed for human readability. It supports comments, multi-line strings, anchors and aliases, and does not require quotes for strings in most cases.
Can I use this for Kubernetes manifests?: Yes — Kubernetes YAML files follow standard YAML syntax. Paste your manifest to validate it and check for indentation errors before applying it.
Does it support YAML anchors and aliases?: Yes — YAML anchors (&name) and aliases (*name) are parsed and resolved correctly.

YAML Formatter