Migration Guide

Guide for upgrading Mastra versions using official documentation and current API verification.

Migration strategy

For version upgrades, follow this process:

1. Check official migration docs

Always start with the official migration documentation: https://mastra.ai/llms.txt

Look for the Migrations or Guides section, which will have:

• Breaking changes for each version
• Automated migration tools
• Step-by-step upgrade instructions

Example sections to look for:

• /guides/migrations/upgrade-to-v1/
• /guides/migrations/upgrade-to-v2/
• Breaking changes lists

2. Use embedded docs for current APIs

After identifying breaking changes, verify the new APIs:

Check your installed version:

cat node_modules/@mastra/core/dist/docs/assets/SOURCE_MAP.json | grep '"ApiName"'
cat node_modules/@mastra/core/dist/[path-from-source-map]

See embedded-docs.md for detailed lookup instructions.

3. Use remote docs for latest info

If packages aren't updated yet, check what APIs will look like: https://mastra.ai/reference/[topic]

See remote-docs.md for detailed lookup instructions.

Quick migration workflow

# 1. Check current version
npm list @mastra/core

# 2. Fetch migration guide from official docs
# Use WebFetch: https://mastra.ai/llms.txt
# Find relevant migration section

# 3. Update dependencies
npm install @mastra/core@latest @mastra/memory@latest @mastra/rag@latest mastra@latest

# 4. Run automated migration (if available)
npx @mastra/codemod@latest v1  # or whatever version

# 5. Check embedded docs for new APIs
cat node_modules/@mastra/core/dist/docs/assets/SOURCE_MAP.json

# 6. Fix breaking changes using embedded docs lookup
# See embedded-docs.md for how to look up each API

# 7. Test
npm run dev
npm test

Common migration patterns

Finding what changed

Check official migration docs: https://mastra.ai/guides/migrations/upgrade-to-v1/overview.md

This will list:

• Breaking changes
• Deprecated APIs
• New features
• Migration tools

Updating API usage

For each breaking change:

1. Find the old API in your code
2. Look up the new API using embedded docs:

   cat node_modules/@mastra/core/dist/docs/assets/SOURCE_MAP.json | grep '"NewApi"'
   cat node_modules/@mastra/core/dist/[path]

1. Update your code based on the type signatures
2. Test the change

Example: Tool execute signature change

Official docs say: "Tool execute signature changed"

Look up current signature:

cat node_modules/@mastra/core/dist/docs/assets/SOURCE_MAP.json | grep '"createTool"'
cat node_modules/@mastra/core/dist/tools/tool.d.ts

Update based on type definition:

// Old (from docs)
execute: async (input) => { ... }

// New (from embedded docs)
execute: async (inputData, context) => { ... }

Pre-migration checklist

• [ ] Backup code (git commit)
• [ ] Check official migration docs: https://mastra.ai/llms.txt
• [ ] Note current version: npm list @mastra/core
• [ ] Read breaking changes list
• [ ] Tests are passing

Post-migration checklist

• [ ] All dependencies updated together
• [ ] TypeScript compiles: npx tsc --noEmit
• [ ] Tests pass: npm test
• [ ] Studio works: npm run dev
• [ ] No console warnings
• [ ] APIs verified against embedded docs

Migration resources

Version-specific notes

General principles

1. Always update all @mastra packages together

   npm install @mastra/core@latest @mastra/memory@latest @mastra/rag@latest mastra@latest

1. Check for automated migration tools

   npx @mastra/codemod@latest [version]

1. Verify Node.js version requirements

• Check official migration docs for minimum Node version

1. Run database migrations if using storage

• Follow storage migration guide in official docs

Getting help

1. Check official migration docs: https://mastra.ai/llms.txt → Migrations section
2. Look up new APIs: See embedded-docs.md
3. Check for errors: See common-errors.md
4. Ask in Discord: https://discord.gg/BTYqqHKUrf
5. File issues: https://github.com/mastra-ai/mastra/issues

Key principles

1. Official docs are source of truth - Start with https://mastra.ai/llms.txt
2. Verify with embedded docs - Check installed version APIs
3. Update incrementally - Don't skip major versions
4. Test thoroughly - Run tests after each change
5. Use automation - Use codemods when available