[Solved] How to find a string is Json or not using Jansson?

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Why don’t you read the documentation where it clearly states:

json_t *json_loads(const char *input, size_t flags, json_error_t *error)
    Return value: New reference.

    Decodes the JSON string input and returns the array or object it contains, 
    or NULL on error, in which case error is filled with information about the error. 
    flags is described above.

Also they even provide an example on how to use this:

root = json_loads(text, 0, &error);
free(text);

if(!root)
{
    fprintf(stderr, "error: on line %d: %s\n", error.line, error.text);
    return 1;
}

solved How to find a string is Json or not using Jansson?