Best practices for debugging LangGraph vs LangChain?

All answers to this question.

LangSmith is still the gold standard for tracing, but for LangGraph, you also have "LangGraph Studio." This is a specialized IDE that lets you visualize the graph nodes and watch the state change in real-time as the agent moves through the loops. When considering "Is LangGraph replacing LangChain for production AI systems?", the debugging experience is actually a pro-LangGraph argument. In a linear chain, you just see a list of steps. In LangGraph, you can see the cycle, go back to a specific checkpoint (time-travel), and re-run the graph from that point with a different prompt to see if it fixes the error.

   Answered 2025-09-17 by Carol Peterson

Is LangGraph Studio free to use, or do I need a Pro subscription to LangSmith? I'm a solo developer and I'm trying to keep my overhead low while learning these new frameworks.

   Answered 2025-09-20 by Kenneth Reed

• Kenneth, as of now, LangGraph Studio is available for local development if you have a LangSmith account, but some of the advanced hosted features might eventually move to a paid tier. Even with the free tier of LangSmith, the tracing for LangGraph is excellent. It shows you the "parent-child" relationship of the nodes very clearly. You can see each "turn" in the loop as a separate entry, which makes it much easier to find exactly where the LLM hallucinated or the logic failed.

     Commented 2025-09-22 by Paul Simmons

The visualizer in the docs is a lifesaver. You can actually export your graph as a PNG or Mermaid diagram to see the logic before you even run it.

   Answered 2025-09-24 by Betty Kelly

• Agreed, Betty. Visualizing the logic before deployment helps catch infinite loops in the graph design, which is a common pitfall for beginners.

     Commented 2025-09-25 by Daniel Carter