javascript - Sveltekit POST method not allowed on endpoint - Stack Overflow

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I am trying to get this fetch method to work in Svelte

When the page.svelte calls the function to fetch the data, in the console I receive this

[HTTP/1.1 405 Method Not Allowed 19ms]

Which I have narrowed down to this

POST method not allowed

Is there a variable I need to set in the config files or is there another solution which I am missing?

// svelte.config.js

import adapter from '@sveltejs/adapter-auto';

const config = {
    kit: {
        adapter: adapter(),
        methodOverride: {
            allowed: ['POST']
        },
    }
};

export default config;

Both files are in the Routes folder

// fetch-data.js

export const POST = async(data) => {
  const response = // get data function here
  return {
    body: {
        data: response
    }
  }
}

// page.svelte

async function fetchData() {
   const response = await fetch('./fetch-data', {
     method: 'POST',
     body: JSON.stringify(),
     headers: {
       'content-type': 'application/json'
     }
   })
   const { data } = await response.json()
   return data
}

I am trying to get this fetch method to work in Svelte

When the page.svelte calls the function to fetch the data, in the console I receive this

[HTTP/1.1 405 Method Not Allowed 19ms]

Which I have narrowed down to this

POST method not allowed

Is there a variable I need to set in the config files or is there another solution which I am missing?

// svelte.config.js

import adapter from '@sveltejs/adapter-auto';

const config = {
    kit: {
        adapter: adapter(),
        methodOverride: {
            allowed: ['POST']
        },
    }
};

export default config;

Both files are in the Routes folder

// fetch-data.js

export const POST = async(data) => {
  const response = // get data function here
  return {
    body: {
        data: response
    }
  }
}

// page.svelte

async function fetchData() {
   const response = await fetch('./fetch-data', {
     method: 'POST',
     body: JSON.stringify(),
     headers: {
       'content-type': 'application/json'
     }
   })
   const { data } = await response.json()
   return data
}

• javascript
• fetch-api
• endpoint
• vite
• sveltekit

Share Improve this question Follow asked Jul 24, 2022 at 12:00 MCCMCC 54222 gold badges55 silver badges2323 bronze badges

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3 Answers 3

Sorted by: Reset to default 4

I had the same error for a different reason, and the syntax in your question and answer has changed again so I'll add my discoveries:

• +page.server.ts should no longer export const POST but instead export const actions: Actions = { ... } which don't need to return anything.
• +server.ts still uses function POST(event: RequestEvent) and needs to return a Response (from the Fetch API).
• Cookies can no longer be set with setHeaders but must use cookies instead. Otherwise the handler also returns 405.

The solution was to change the POST variable name to lowercase in the get-data.js file

I had the same problem because of old SvelteKit version (I used .456, current version at the time this was written is .484). So make sure you have the most recent version of framework, when referring to the docs ;)

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