
GPT-Migrate
Migrate your codebase from one language or framework to another
FreeCLIOpen SourceAI6,252 impressions#172 of its week1 comment
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>log in to commentHey! Josh here, maker of GPT-Migrate, now one of the top LLM projects on GitHub. Thank you for taking the time to check out the project! Code migration is a painful and arduous task. A couple weeks ago, I had to do a migration for another project I’ve been hacking on. It took a few long days, but as I migrated, tested, and debugged function after function, I started to realize that this process could be largely, if not fully, handled with today’s most powerful LLMs. Last week at a hackathon, GPT-Migrate was born. It works by creating a standardized environment (Docker), translating the code of the source project to the target language/framework, creating unit tests against the source project, testing the newly generated codebase against these, and iteratively debugging based on the error messages and logs. The most common question I hear is, “does it work with language x to language y?” My answer is: “try it!” Usually the tool will create *something* useful, even if it isn’t totally correct the first time (and with human help, it can cross the finish line). I’d encourage you to give it a shot with a codebase that you have, even if just for fun! I’d recommend using GPT-4 32k if you do. Smaller models can work but sometimes the input size can be too large. We’re currently working on an improvement here. What’s next? There are a few “boring” improvements we’ll be making, such as creating more robust unit tests, better and more benchmarks, support for more LLMs, etc. There are also a few exciting things on the horizon that you’ll need to stay tuned to hear about! (Did someone say no more devops? 👀) Cheers and happy migrating!
GPT-Migrate uses LLMs to automatically translate a codebase from one language or framework to another.
- for
- Developers needing to port apps between languages/frameworks quickly.
- pricing
- open source
- license
- MIT
Key features
- Dockerized target environment — Creates a Docker container for the target language/framework automatically.
- Dependency mapping — Detects source dependencies and selects equivalent target dependencies.
- Iterative debugging — Runs tests and debugs migrated code with log-based suggestions.
- Unit test generation — Generates Python unittest suites for the migrated code.
- Customizable prompts — Allows guideline and style customizations via prompt hierarchy.
- Multi-step control — Supports separate setup, migrate, test, or full-run steps via CLI flags.
Use cases
- Port a Flask API to FastAPI or Node.js in minutes
- Convert a React Native mobile app to native Swift/Android code
- Migrate a Vue frontend to a Typescript + Next.js stack
- Generate and run unit tests for a newly migrated codebase
GPT-Migrate vs alternatives
GPT-Migrate | BuildShip | Fluent CI | Langfuse | QueryPal | |
|---|---|---|---|---|---|
| Best for | LLM-driven codebase migration | AI-powered visual backend creation | TypeScript CI/CD pipelines | LLM app analytics | Support automation |
| Pricing | Open source | Free | Free | Subscription | Free |
| DevHunt upvotes | 2 | 118 | 158 | 89 | 82 |
| Launched | Jan 2023 | Jan 2023 | Jan 2024 | Jan 2023 | Mar 2024 |
- GPT-Migrate vs BuildShip: BuildShip provides a visual AI-driven backend builder, not automated codebase migration.
- GPT-Migrate vs Fluent CI: Fluent CI lets you write CI/CD pipelines in TypeScript, unrelated to code migration.
- GPT-Migrate vs Langfuse: Langfuse offers observability for LLM apps, not migration functionality.
- GPT-Migrate vs QueryPal: QueryPal automates support-team workflows, not code translation.
GPT-Migrate FAQ
What model does GPT-Migrate use by default?+
It defaults to GPT-4-32k, but you can specify any model supported by OpenRouter or OpenAI.
Do I need to install anything besides Docker?+
You need Docker and optionally Poetry for dependency management; the tool runs via a Python script.
Can GPT-Migrate test the migrated code automatically?+
Yes, it can generate unit tests and optionally run them against the original app (if you expose it) and the migrated app.
Is GPT-Migrate ready for production use?+
It is currently in alpha; it works well on simple benchmarks but may need human assistance for complex languages.
How do I specify source and target languages?+
Use the --sourcelang and --targetlang CLI flags, e.g., --targetlang nodejs.
Is there a way to guide the migration style?+
You can pass a --guidelines string to enforce stylistic rules like “use tabs, not spaces.”
Summarized by DevHunt from github.com · Sep 29, 2026. Details may change; check the official site.
GPT-Migrate
BuildShip
Fluent CI
Langfuse
QueryPal


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