Mermaid API is in open beta

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Hi there, 


Mermaid API is in **open beta as of today**. Your program, agent, or pipeline sends diagram code over HTTP and gets back an answer, without running Mermaid itself. Send diagram code, or a description, over HTTP. Get back one of four things:


- 

**Validate**: whether the code is valid, and if not, the line and column where it breaks, with a stable error code your program can act on.


- 

**Render**: SVG, PNG, or PDF, with any Mermaid theme, look, and layout.


- 

**Generate**: describe a diagram, get working Mermaid code.


- 

**Repair**: send broken code, get working code.


It always runs the latest Mermaid, including our own layouts and themes. No headless browser to host and no version to track.


- Sign in with your Mermaid account and create a key [here](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/WCPzyXJTZ6uvdOyxBTwOtCmp9CfruyQC/w9832Xx8ZQyV) 
- Docs, with examples and an OpenAPI spec [here](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/WCPzyXJTZ72ihRCDXZQ4ewwcHzYzAg2K/lWhFstpc2JKv) 
- More on the product [here](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/WCPzyXJTZ7AVlTPTtetkQh6PQmS6QNeS/WZRwZAXhwKit) 

It’s **free during the beta**: every account gets a monthly allowance of credits, and you can buy more if you run out. The beta runs through November – and we’ll publish pricing at least two weeks before it ends. Keys keep working, and any credits you buy carry over.


Breaking changes will be announced in the changelog and there’s no uptime guarantee yet. Try it on something real and [tell us how it went](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/WCPzyXJTZ7IIpVckFkNQCRGCZZLDg5Ga/MAFJfubg4mfF): what worked, what didn’t, what’s missing. If something breaks, include the request id from the response so we can trace it.


Excited to see what you build,
Knut

*Founder & CTO, Mermaid*

 

[Contact Us](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/WCPzyXJTZ833DiuKOHFSouCxQIfvCIxM/4jNz85l_h5T1) | [Documentation](https://f1gxg.r.a.d.sendibm1.com/mk/cl/f/sh/28xHLtxYQ4yaodAOm4PvtFbvn3yFc4R7NY/5w6RzWLpMhHl) | [Unsubscribe](https://f1gxg.r.a.d.sendibm1.com/mk/un/v2/sh/WCPxRrWByckTgqgDgz7eQTgrdi8Yz2IS/cWbDBwun5xhV)

Accession

nse/mermaid-chart/2026-11-12/6843

From

Knut @ Mermaid · no-reply@mermaid.ai

Sent

12 November 2026 · 23:00 UTC