The template literal expression is invalid due to the "string | null" type when sending authorization

While working on implementing authorization, I encountered an error from Ts-eslint stating that there was an "Invalid type 'string | null' of template literal expression" when trying to execute the functionality.

The data being retrieved from localstorage can either be 'null' or a 'string', but it also needs to be combined with 'Bearer' for authentication.


onMounted(async() => {
    let myToken = localStorage.getItem('token');
    
    await axios.post(
        'http://localhost:3000/getdocuments', 
        {headers:{'Authorization': `Bearer ${myToken}`}}
    )
    .then((res) => {
        console.log(res);
    })
    .catch(err => {
        console.log(err);
    })
})
typescriptaxiosvuejs3

Answer №1

It is essential to trigger this request only if the token is available

onMounted(async ()=>{
      let authenticationToken = localStorage.getItem('token');
      if (!authenticationToken) {
        console.warn('The token is not present');
      } else {
        await axios.post(
          'http://localhost:3000/getdocuments', 
          {headers:{'Authorization':`Bearer ${authenticationToken}`}}
        )
        .then((response)=>{
            console.log(response);
        })
        .catch(error=>{
            console.log(error);
        })
      }
    })

Answer №2

Apologies for the delay, I encountered a similar issue and was able to resolve it by implementing a null guard check.

Once you have obtained your token,

if (!myToken) {
    // Handle the error
}

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