Nuxt•2mo ago

useFetch error payload is missing fields.

I have an expressjs backend api route returning error like res.stats(500).json({message: 'Unable to locate resource', redirectUrl: 'http://google.com'}) in NUXT3 page, I call this api as const { data: response, error } = await useFetch<any>('/api/v2/validate/', { method: 'POST', body: { code: code }, }); The error.value.data contains message field but not redirectUrl. What could be the reason for that?

2 Replies

kapa.ai•2mo ago

Hi @dan1234. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- The issue you're experiencing with missing fields in the error payload when using useFetch is related to how Nuxt handles serialization of data from API routes. When fetching data from server routes using useFetch, the response is serialized using JSON.stringify, which has limitations with JavaScript primitive types. Nuxt tries to convert the return type of useFetch to match the actual value, but this process might not preserve all fields in error responses. Based on the knowledge sources, there are a couple of potential reasons for your issue: 1. Serialization limitations: When data is transferred from server to client, some fields might be lost in the serialization process, especially in error objects. 2. Error handling in Nuxt: Nuxt might be handling error responses differently than regular responses, possibly extracting only specific fields like the 'message' field. To solve this issue, you could try one of these approaches: 1. Custom serializer function: Define a toJSON method on your returned object to control exactly what gets serialized:

// In your Express.js backend
res.status(500).json({
  message: 'Unable to locate resource', 
  redirectUrl: '<http://google.com',>
  toJSON() {
    return {
      message: this.message,
      redirectUrl: this.redirectUrl
    }
  }
})

// In your Express.js backend
res.status(500).json({
  message: 'Unable to locate resource', 
  redirectUrl: '<http://google.com',>
  toJSON() {
    return {
      message: this.message,
      redirectUrl: this.redirectUrl
    }
  }
})

2. Access the full response: You might need to include the response in your destructuring to access all fields:

const { data: response, error, response: fullResponse } = await useFetch<any>('/api/v2/validate/', {
  method: 'POST',
  body: { code: code },
});

const { data: response, error, response: fullResponse } = await useFetch<any>('/api/v2/validate/', {
  method: 'POST',
  body: { code: code },
});

3. Use $fetch directly: For POST requests, the documentation suggests that $fetch might be more appropriate than useFetch, especially for user interactions:

try {
  const response = await $fetch('/api/v2/validate/', {
    method: 'POST',
    body: { code: code },
  });
} catch (error) {
  // Full error object should be available here
  console.log(error);
}

try {
  const response = await $fetch('/api/v2/validate/', {
    method: 'POST',
    body: { code: code },
  });
} catch (error) {
  // Full error object should be available here
  console.log(error);
}

This issue might also be related to a known bug in Nuxt. There have been fixes for error handling in SSR contexts, as mentioned in this GitHub PR, so ensuring you're on the latest version of Nuxt might help. If you're still experiencing issues, you might want to check if there are any specific error handling configurations in your Nuxt setup that could be affecting how error responses are processed. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@560924716270092300> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

Gaming

Programming

useFetch error payload is missing fields.

Did you find this page helpful?