How can I troubleshoot and resolve the issue of “no content to map due to end-of-input” in the JSON-type data?

In the context of Salesforce, if you are getting the issue message of “no content to map due to end-of-input”, then you should follow the several steps which are given following for resolving and troubleshooting this particular issue:-

Checking JSON data

First, you would need to check the JSON data that you are trying to parse. In this, you should check whether your particular JSON data is valid or not.

Input stream position

If your objective is to read the JSON from an input stream, then try to make sure that the stream is positioned appropriately. The end of the input error can occur if the particular stream has reached its end before the task of parsing is completed.

Verify data source

Try to confirm that the source for which you providing the JSON data should be properly initialized and it should contain the required and expected content.

Exception handling

You can also surround your particular JSON parsing code with exception handling for the task of catching and handling any exceptions that are related to the parsing. For example, in Jackson:-

ObjectMapper objectMapper = new ObjectMapper();
Try {
    YourObjectType obj = objectMapper.readValue(jsonString, YourObjectType.class);
} catch (JsonProcessingException e) {
    e.printStackTrace();
    // Handle the exception or log it
}
 In Gson:-
Gson gson = new Gson();
Try {
    YourObjectType obj = gson.fromJson(jsonString, YourObjectType.class);
} catch (JsonSyntaxException e) {
    e.printStackTrace();
    // Handle the exception or log it
}

Logging and debugging

You can use the logging or debugging tools for the task of inspecting the JSON data so that you can identify any further issues.