SQL To YAML - Complete Guide

SQL to YAML converter transforms SQL query results into YAML format. YAML is human-readable and commonly used for configuration files. Great for readable data exports, configuration management, and documentation purposes.

How It Works

Each row becomes a YAML mapping with column names as keys. Lists represent multiple rows. YAML's indentation-based syntax creates clean, readable output. Handles strings, numbers, booleans, and nulls natively.

Technical Details

YAML 1.2 spec is JSON-superset. Strings containing special chars need quoting. Multi-line strings use | (literal) or > (folded). Null is explicit null keyword. Indentation is significant (spaces only, typically 2).

Common Use Cases

1. Configuration Export: Export database settings as YAML config.
2. Test Fixtures: Create readable test data files.
3. Documentation: Human-readable data for documentation.
4. Ansible/K8s: Generate YAML for DevOps tools.

Code Examples

SQL to YAML Conversion

function yamlValue(value) {
  if (value === null) return 'null';
  if (typeof value === 'number') return value;
  if (typeof value === 'boolean') return value;

  const str = String(value);
  // Quote if contains special chars or looks like other types
  if (/^[\d.]+$/.test(str) || /[:#{}[\],&*?|<>=!%@`]/.test(str) ||
      str === 'true' || str === 'false' || str === 'null' ||
      str.includes('\n')) {
    return '"' + str.replace(/"/g, '\\"') + '"';
  }
  return str;
}

function sqlToYAML(tableName, columns, rows) {
  let yaml = `${tableName}:\n`;
  rows.forEach(row => {
    yaml += '  -\n';
    columns.forEach((col, i) => {
      yaml += `    ${col.name}: ${yamlValue(row[i])}\n`;
    });
  });
  return yaml;
}

// Output:
// users:
//   -
//     id: 1
//     name: John
//     active: true

Represent rows as list items, handle special characters and types appropriately.

Tips & Best Practices

• Use 2-space indentation
• Quote strings with special chars
• Use null keyword for NULLs
• Validate with YAML linter
• Consider JSON for complex data

Common Mistakes to Avoid

• Using tabs instead of spaces
• Not quoting special strings
• Inconsistent indentation
• Forgetting to escape quotes

When to Use This Tool

Use SQL to YAML for configuration exports, readable test data, documentation, and DevOps tooling like Ansible or Kubernetes.

Frequently Asked Questions

When should I quote strings?

Quote if: starts with special char (@, `, *, etc.), looks like number/boolean, contains colon-space, or has leading/trailing spaces. When in doubt, quote.

How do I handle NULL?

Use null keyword (unquoted). Example: value: null. Alternatively, use ~ or empty value. Be consistent throughout the document.

What about multi-line strings?

Use | for literal blocks (preserves newlines) or > for folded blocks (joins lines). Indented content follows the block indicator.

Tabs or spaces?

YAML requires spaces for indentation. Tabs are not allowed. Standard is 2 spaces per level. Be consistent throughout.

Get Started

Ready to try SQL To YAML? Use the tool now - it's free, fast, and works right in your browser.

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Last updated: June 27, 2026