Xepoca
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Developer tool

YAML Formatter & Validator

Format, validate, compact, inspect, and convert YAML. Work with comments, anchors, aliases, block scalars, tags, and multi-document streams without sending configuration files to a server.

🔒 100% private browser processing

Your YAML remains on your device. Xepoca does not upload, store, or inspect configuration files, secrets, deployment manifests, or API definitions.

YAML input

Paste YAML, drop a file, or load a practical example.

No file selected20 lines · 372 B

Formatter settings

Parser: standards-aware YAML 1.2/1.1 processing with comment, anchor, alias, tag, and multi-document support.

Output and inspection

Valid YAML · 1 document

1# Xepoca application configuration
2app:
3  name: Xepoca
4  environment: production
5  url: https://xepoca.com
6 
7features:
8  localProcessing: true
9  tools:
10    - name: YAML Formatter
11      category: Developer Tools
12      enabled: true
13    - name: JSON Formatter
14      category: Converters
15      enabled: true
16 
17limits:
18  uploadSizeMb: 5
19  allowedExtensions:
20    - .yaml
21    - .yml
22    - .txt
23

Documents

1

16 mapping keys

Collections

8

6 maps · 2 sequences

References

0

0 anchors · 0 aliases

Output size

386 B

Input 372 B

Scalar nodes

30

Comments

1

Block scalars

0

Maximum depth

4

How YAML formatting and validation work

YAML represents mappings, sequences, and scalar values using indentation and a compact set of indicators. Small spacing mistakes can change structure, so the validator parses the complete document rather than applying line-based cleanup.

Formatting rebuilds valid YAML from its parsed document model. Comments, anchors, aliases, explicit tags, block scalars, directives, and document boundaries are retained when preservation is enabled.

JSON conversion resolves YAML values into JavaScript data. Because JSON has no comments, anchors, aliases, custom tags, or multiple top-level documents, the JSON panel focuses on the resolved data rather than source-level YAML features.

Useful for configuration and data workflows

CI and deployment

Review GitHub Actions, Kubernetes, Docker Compose, Netlify, and other automation configuration before committing changes.

API definitions

Format OpenAPI documents, inspect nested schemas, and convert resolved YAML data into JSON for compatible tooling.

Application settings

Validate environment-specific configuration, feature flags, service endpoints, and structured project settings.

Debugging YAML

Locate duplicate keys, indentation errors, malformed flow collections, unresolved aliases, and unsupported tags with parser-level diagnostics.

Related Xepoca tools

JSON Formatter

Beautify and validate JSON.

CSV ↔ JSON

Convert structured tabular data.

XML Formatter

Format and validate XML documents.

SQL Formatter

Beautify SQL queries locally.

Frequently Asked Questions

Is the YAML Formatter free?+
Yes. You can format, compact, validate, inspect, and convert YAML without creating an account.
Are my configuration files uploaded?+
No. All processing occurs locally in your browser, so YAML files and their contents remain on your device.
Does it support YAML 1.1 and YAML 1.2?+
Yes. YAML 1.2 is the default, and YAML 1.1 is available for older schemas and merge-key behavior. An explicit version directive inside the source takes precedence.
Are comments, anchors, and aliases preserved?+
Yes, when comment and AST preservation is enabled. JSON conversion resolves aliases into data because JSON does not have equivalent anchor or alias syntax.
Can I validate Kubernetes or GitHub Actions YAML?+
The tool validates YAML syntax and structure. It does not apply product-specific JSON Schemas, so a syntactically valid file may still contain fields that a particular platform rejects.
What does compact mode do?+
Compact mode renders collections in YAML flow style and removes avoidable line wrapping. It remains YAML, but it is optimized for size rather than readability.