Upon receiving the API response, my Angular webpage is failing to redirect to a different page

After executing my code in TypeScript, I encountered an issue with the updateProduct method calling the API to update a product based on form values. The update functionality works fine, but afterwards, I am receiving the following error:

error: 
SyntaxError: Unexpected token 'P', "Product Up"... is not valid JSON at JSON.parse 
(<anonymous>) at XMLHttpRequest.onLoad (https://localhost:4200/vendor.js:36220:39) at 
"Unexpected token 'P', \"Product Up\"... is not valid JSON"
stack: 
"SyntaxError: Unexpected token 'P', \"Product Up\"... is not valid JSON\n    at JSON.parse (<anonymous>)\n    at XMLHttpRequest.onLoad (https://localhost:4200/vendor.js:36220:39)

This error is being caught in the TypeScript file where the updateProduct method is called.

this.shopService.updateProduct(this.productForm.value).subscribe(response => {
this.router.navigateByUrl('/admin');
}, error => {
console.log(error);
this.errors = error.errors;
});

I'm seeking assistance in understanding what is causing this specific error to occur.

Below is a snippet of code from the API:

var productMapped = _mapper.Map<ProductDto, Product>(product);

_productsRepo.Update(productMapped);

if(await _productsRepo.SaveAll())
{
return Ok("Product Updated with success");
}

return BadRequest("Could not update the product");

Answer №1

... is indicating that the JSON.parse function is unable to parse the given input as valid JSON.

This error typically occurs when the server expects a JSON response from an HTTP call but instead receives a plain string, causing the parser to fail.

If you do not need to use the response value, consider sending back an empty OK response instead.

To handle reading the response string, adjust the accept header in your HTTP request to "text/plain" instead of "application/json".

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