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Mermaid.ink Timeout Error When Using Short Node Name in langgraph Diagram #617

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opened 2026-02-20 17:40:59 -05:00 by yindo · 6 comments
yindo commented 2026-02-20 17:40:59 -05:00
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Originally created by @akash97715 on GitHub (May 12, 2025).

Checked other resources

  • I added a very descriptive title to this issue.
  • I used the GitHub search to find a similar question and didn't find it.
  • I am sure that this is a bug in LangChain rather than my code.
  • The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
  • I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Example Code

graph_image = Image(graph.get_graph().draw_mermaid_png())

Error Message and Stack Trace (if applicable)

TimeoutError: The read operation timed out

requests.exceptions.ReadTimeout: HTTPSConnectionPool(host='mermaid.ink', port=443):
Read timed out. (read timeout=10)

Description

I m trying to use langgrqph get graph mermaid api. Suggest me best way step by step to resolve this issue

System Info

Langgraph latest

Originally created by @akash97715 on GitHub (May 12, 2025). ### Checked other resources - [x] I added a very descriptive title to this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangChain rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package). - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Example Code graph_image = Image(graph.get_graph().draw_mermaid_png()) ### Error Message and Stack Trace (if applicable) TimeoutError: The read operation timed out requests.exceptions.ReadTimeout: HTTPSConnectionPool(host='mermaid.ink', port=443): Read timed out. (read timeout=10) ### Description I m trying to use langgrqph get graph mermaid api. Suggest me best way step by step to resolve this issue ### System Info Langgraph latest
yindo closed this issue 2026-02-20 17:40:59 -05:00
yindo commented 2026-02-20 17:40:59 -05:00
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@hinthornw commented on GitHub (May 12, 2025):

If mermaid.ink is timing out, you can run locally with pyppeteer: https://langchain-ai.github.io/langgraph/how-tos/graph-api/?h=pyppe#png

@hinthornw commented on GitHub (May 12, 2025): If mermaid.ink is timing out, you can run locally with pyppeteer: https://langchain-ai.github.io/langgraph/how-tos/graph-api/?h=pyppe#png
yindo commented 2026-02-20 17:40:59 -05:00
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@akash97715 commented on GitHub (May 12, 2025):

Used pyppetter(failed)and graphviz(some c++ graphc depemdency). Only print_ascii() works. But i want png

@akash97715 commented on GitHub (May 12, 2025): Used pyppetter(failed)and graphviz(some c++ graphc depemdency). Only print_ascii() works. But i want png
yindo commented 2026-02-20 17:40:59 -05:00
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@gbaian10 commented on GitHub (May 12, 2025):

You can also consider outputting in Mermaid syntax and then use some online Mermaid tools to generate images.
For example: https://mermaid.live/

Or some Markdown renderers also support rendering Mermaid.

@gbaian10 commented on GitHub (May 12, 2025): You can also consider outputting in Mermaid syntax and then use some online Mermaid tools to generate images. For example: https://mermaid.live/ Or some Markdown renderers also support rendering Mermaid.
yindo commented 2026-02-20 17:40:59 -05:00
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@akash97715 commented on GitHub (May 12, 2025):

Got it, but i checked the implementation code for lamggrqph graph generate, it is doing the same thing internally. Basically generating the mermaid syntax snd calling the API, wondering why its failing!

@akash97715 commented on GitHub (May 12, 2025): Got it, but i checked the implementation code for lamggrqph graph generate, it is doing the same thing internally. Basically generating the mermaid syntax snd calling the API, wondering why its failing!
yindo commented 2026-02-20 17:40:59 -05:00
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@akash97715 commented on GitHub (May 12, 2025):

You can also consider outputting in Mermaid syntax and then use some online Mermaid tools to generate images. For example: https://mermaid.live/

Or some Markdown renderers also support rendering Mermaid.

Any example will be great help using markdown :-) do u have those markdown implementation wrapper on langgraph

@akash97715 commented on GitHub (May 12, 2025): > You can also consider outputting in Mermaid syntax and then use some online Mermaid tools to generate images. For example: https://mermaid.live/ > > Or some Markdown renderers also support rendering Mermaid. Any example will be great help using markdown :-) do u have those markdown implementation wrapper on langgraph
yindo commented 2026-02-20 17:40:59 -05:00
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@vbarda commented on GitHub (May 12, 2025):

this is a mermaid.ink API issue, not a langgraph issue - we will look into more options for rendering that don't rely on the 3rd party API, but in the meantime you can use the suggestions above w/ Pyppeteer / custom services

re: markdown the solution would be simply pasting generated mermaid syntax from graph.draw_mermaid() and pasting to a markdown renderer (same as w/ mermaid.live)

@vbarda commented on GitHub (May 12, 2025): this is a mermaid.ink API issue, not a langgraph issue - we will look into more options for rendering that don't rely on the 3rd party API, but in the meantime you can use the suggestions above w/ Pyppeteer / custom services re: markdown the solution would be simply pasting generated mermaid syntax from `graph.draw_mermaid()` and pasting to a markdown renderer (same as w/ mermaid.live)
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Reference: langchain-ai/langgraph#617
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