MDX Syntax Best Practices

Common MDX parsing errors in Mintlify documentation and how to prevent them

MDX Syntax Best Practices and Error Prevention

This guide documents common MDX parsing errors in Mintlify documentation and how to prevent them.

Common Errors and Solutions

1. Unescaped Angle Brackets Before/After Numbers

Error: Unexpected character '1' (U+0031) before name

Cause: Using < or > directly before numbers (e.g., <100K, >1M)

Solution: Use HTML entities

❌ Wrong:

- Low volume (<100K requests/mo)
- High volume (>1M requests/mo)

✅ Correct:

- Low volume (<100K requests/mo)
- High volume (>1M requests/mo)

Automated Fix: Run python scripts/fix_mdx_angle_brackets.py

2. Missing Blank Lines Around Component Tags

Error: Expected a closing tag for <CodeGroup>

Cause: Missing blank lines after opening or before closing component tags

Solution: Always add blank lines

❌ Wrong:

<CodeGroup>
  (backticks)bash
  code here
  (backticks)
(closing CodeGroup tag)

✅ Correct:

<CodeGroup>

  (backticks)bash
  code here
  (backticks)

(closing CodeGroup tag)

Components requiring blank lines:

• <CodeGroup>
• <Accordion>
• <AccordionGroup>
• <Tabs> / <Tab>
• <Card> / <CardGroup>
• <Steps> / <Step>

3. Stray Language Tags After Code Blocks

Error: Various parsing errors

Cause: Accidental xml or other language tags after closing triple backticks

Solution: Remove stray language tags

❌ Wrong:

command here
```xml

✅ Correct:
```bash
command here

Automated Fix: find . -name "*.mdx" -exec sed -i 's/```xml$/```/g' {} \;

4. Heredoc Syntax in Code Blocks

Error: Unexpected closing slash '/' in tag

Cause: Using heredoc syntax with quotes that confuse the MDX parser

Solution: Use separate code blocks or avoid heredoc quotes

❌ Problematic:

kubectl patch deployment grafana --patch '
spec:
  template:
    ...
'

✅ Better:

kubectl patch deployment grafana --patch-file=patch.yaml

Then show the patch file separately:

spec:
  template:
    ...

5. Unclosed or Mismatched Tags

Error: Expected a closing tag for <Accordion>

Cause: Missing closing tags or tags closed in wrong order

Solution: Ensure all tags are properly matched

❌ Wrong (missing closing tag):

<AccordionGroup>
  <Accordion title="First">
    Content
  </Accordion>
  <Accordion title="Second">
    Content
  {/* Missing </Accordion> */}
</AccordionGroup>

✅ Correct:

<AccordionGroup>
  <Accordion title="First">
    Content
  </Accordion>
  <Accordion title="Second">
    Content
  </Accordion>
</AccordionGroup>

Validation: Run python scripts/validate_mdx_syntax.py

Preventive Scripts

1. Fix Angle Brackets

python scripts/fix_mdx_angle_brackets.py --dry-run  # Preview changes
python scripts/fix_mdx_angle_brackets.py            # Apply fixes

2. Validate MDX Syntax

python scripts/validate_mdx_syntax.py                     # Validate all files
python scripts/validate_mdx_syntax.py --file path.mdx     # Validate one file
python scripts/validate_mdx_syntax.py --fix               # Fix spacing issues

3. Remove Stray XML Tags

find . -name "*.mdx" -exec sed -i 's/```xml$/```/g' {} \;

4. Run Mintlify Link Checker

mintlify broken-links

Pre-Commit Checklist

Before committing MDX files:

• Run python scripts/fix_mdx_angle_brackets.py
• Run python scripts/validate_mdx_syntax.py --fix
• Run mintlify broken-links to verify no parsing errors
• Check for stray xml tags: `grep -r 'xml’ docs/ —include=“*.mdx”`
• Verify blank lines around all component tags

Common Patterns to Avoid

Shell Commands with Quotes

Instead of using heredoc syntax with quotes in code blocks, use separate blocks:

Instead of this:

kubectl patch --patch '
spec:
  key: value
'

Do this: First create patch.yaml:

spec:
  key: value

Then apply:

kubectl patch --patch-file=patch.yaml

Comparison Operators

Always escape comparison operators when followed by numbers:

• ✅ Use: < and >
• ❌ Avoid: < and >

Component Nesting

Keep component nesting clean and well-spaced:

<OuterComponent>

  <InnerComponent>
    Content here
  </InnerComponent>

  <InnerComponent>
    More content
  </InnerComponent>

</OuterComponent>

Automated CI/CD Integration

Add to .github/workflows/docs-validation.yml:

name: Validate Documentation

on: [push, pull_request]

jobs:
  validate:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Setup Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.11'

      - name: Fix angle brackets
        run: python scripts/fix_mdx_angle_brackets.py

      - name: Validate MDX syntax
        run: python scripts/validate_mdx_syntax.py

      - name: Check for stray XML tags
        run: |
          if grep -r '```xml' docs/ --include="*.mdx"; then
            echo "Error: Found stray XML tags"
            exit 1
          fi

      - name: Run Mintlify link checker
        run: mintlify broken-links

Emergency Fixes

If mintlify broken-links fails:

1. Note the file and line number from the error
2. Run validation on that specific file:
   python scripts/validate_mdx_syntax.py --file docs/path/to/file.mdx
   

3. Check for common issues in order:
   • Unescaped < or > before numbers
   • Missing blank lines around components
   • Stray ````xml` tags
   • Heredoc syntax with quotes
   • Unclosed/mismatched tags
4. Fix and re-run mintlify broken-links

Additional Resources

• Mintlify MDX Documentation
• MDX Specification
• Project scripts:
  • /scripts/fix_mdx_angle_brackets.py
  • /scripts/validate_mdx_syntax.py
  • /scripts/add_code_block_lang_tags.py