What is YAML Format?
A YAML Formatter is a critical tool for DevOps engineers, cloud architects, and developers who rely on YAML (YAML Ain't Markup Language) for configuration. Unlike JSON, YAML relies heavily on whitespace and indentation, making it prone to subtle syntax errors that can bring down deployment pipelines or misconfigure servers. This tool parses your YAML code, validates its structure against the official spec, and reformats it with consistent indentation (2 or 4 spaces). It is particularly useful for working with Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and Ansible playbooks. The tool runs entirely in your browser, ensuring that your infrastructure-as-code secrets and configurations remain private. It also provides instant conversion to JSON, allowing for easy interoperability with other tools and APIs.
Input Formats
- Raw YAML strings
- .yaml / .yml files
- Kubernetes manifests
- Docker Compose files
Output Results
- Formatted YAML
- JSON equivalent
- Syntax error highlights
Key Features
Who is this for?
Infrastructure as Code
DevOps engineers writing Kubernetes manifests or Helm charts need to ensure strict YAML compliance.
CI/CD Pipelines
Developers configuring CI/CD workflows (GitHub Actions, GitLab CI) need to validate syntax before pushing code.
Server Configuration
Sysadmins managing configuration files for tools like Ansible, Prometheus, or Swagger.
How to Use
Paste your YAML code into the editor.
The tool will automatically validate the syntax.
Adjust indentation settings (2 or 4 spaces) if needed.
View the JSON equivalent in the side panel.
Copy the formatted YAML or download it as a file.
Examples
Input
name: John Doe
age: 30
skills:
- coding
- testingOutput
name: John Doe
age: 30
skills:
- coding
- testingCommon Errors
- Tab characters used instead of spaces
- Incorrect indentation levels
- Duplicate keys in objects
- Unquoted strings containing special characters
Code Examples
Python
import yaml
with open('config.yaml', 'r') as file:
config = yaml.safe_load(file)
print(config)JavaScript (js-yaml)
const yaml = require('js-yaml');
const fs = require('fs');
const doc = yaml.load(fs.readFileSync('config.yml', 'utf8'));
console.log(doc);