System.Text.Json.JsonException: The input does not contain any JSON tokens

json blazor json-deserialization json-serialization
Broad3857 picture Broad3857 · Mar 10, 2020 · Viewed 12.8k times · Source

I'm just trying to use a Http POST method in a Blazor app through

public async Task CreateUnit(UnitEntity unit)
{
    await _http.PostJsonAsync<UnitEntity>("api/units", unit);
}

_http and myObject have been defined elsewhere, but I'm getting this weird error. Can anyone help? This is the closest thing I could find elsewhere: https://github.com/dotnet/runtime/issues/30945.

The full error message is

System.Text.Json.JsonException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.

And it here's the stack

enter image description here

Answer

Lukas picture Lukas · Dec 21, 2020

Another reason this error could pop up, as it did for me, is simply because the API endpoint doesn't exist because it was misspelled.

Related questions

How do I POST JSON data with cURL?

I use Ubuntu and installed cURL on it. I want to test my Spring REST application with cURL. I wrote my POST code at the Java side. However, I want to test it with cURL. I am trying to post …

Read More
What is the correct JSON content type?

I've been messing around with JSON for some time, just pushing it out as text and it hasn't hurt anybody (that I know of), but I'd like to start doing things properly. I have seen so many purported "standards" for …

Read More
Why can't Python parse this JSON data?

I have this JSON in a file: { "maps": [ { "id": "blabla", "iscategorical": "0" }, { "id": "blabla", "iscategorical": "0" } ], "masks": [ "id": "valore" ], "om_points": "value", "parameters": [ "id": "valore" ] } I wrote this script to print all of the JSON data: import json from pprint import pprint …

Read More