Invalid route parameter returned by getStaticPaths().

GetStaticPathsInvalidRouteParam: Invalid getStaticPaths() route parameter for KEY. Expected a string or undefined, received VALUE_TYPE (VALUE)

What went wrong?

Since params are encoded into the URL, only certain types are supported as values.

/route/[id].astro

---
export async function getStaticPaths() {
  return [
    { params: { id: '1' } } // Works
    { params: { id: 2 } } // Does not work
    { params: { id: false } } // Does not work
    { params: { id: [1, 2] } } // Does not work
  ];
}
---

In routes using rest parameters, undefined can be used to represent a path with no parameters passed in the URL:

/route/[...id].astro

---
export async function getStaticPaths() {
  return [
    { params: { id: '1' } } // /route/1
    { params: { id: '2' } } // /route/2
    { params: { id: undefined } } // /route/
  ];
}
---

See Also:

• getStaticPaths()
• params