> For the complete documentation index, see [llms.txt](https://docs.loadmill.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.loadmill.com/general/api-testing1/api-testing-troubleshooting.md).

# API Testing troubleshooting

### I'm getting an error that my JSON Path expression is invalid, although the path is correct. What should I do?

![](/files/-Ml5DmoheBLoA9qioS5g)

That happens due to the underscore in the JSON Path expression, change it to be like shown below and it will work:

![](/files/-Ml5DvpdwRLnZipGw8zK)
