Pass Array to FastAPI GET endpoint from postman

Question

I have the following endpoint in FastAPI:

@router.get("/", response_model=ApiResponseMultiple[MyObject], response_model_exclude_none=True)
async def get_objs(
    request: Request,
    ids: list
):
    """Get stuffs"""
    print(ids)
...

And I cannot get the list to popoulate froma. postman call. I have tried passing the following from postman:

• 1,2
• [1,2]
• ids=1&ids=2
• ids[]=1&ids[]=2
• ids[0]=1&ids[1]=2

Always my print statement spits out None.

Answer 1

Even though you are sending the paramter ids as a list, FastAPI is expecting it as body parameter, and sending body data for GET request is not allowed :)

Modify your code to mark the parameter ids explicitly as a query parameter.

Here is a sample:

from fastapi import Query

@router.get("/")
async def get_objs(
    ids: list = Query(...)
):
    """Get stuffs"""
    print(ids)
...