@Robert_Holscher the disconnect is because you have the readbytes in the wrong place. Must be before the Blynk libraries. json is approx 940 so 1024 is currently big enough.
All working here on my WeMos D1 Mini:
{"id":380876,"matchnr":20108,"datetime":"2015-11-06T19:00:00.000Z","matchtypeid":1,"teams":[{"id":1067751,"name":"DOV 4","teamplayers":[{"id":2137382,"name":"M. Petiet","subst":0},{"id":3294276,"name":"S. de Hoogt","subst":0},{"id":3413244,"name":"J. van der Aar","subst":0},{"id":3829013,"name":"D. Bendter","subst":0},{"id":4060662,"name":"R. Holscher","subst":0}],"matchplayers":[{"id":4060662,"name":"R. Holscher","dbl":1},{"id":3413244,"name":"J. van der Aar","dbl":1},{"id":3294276,"name":"S. de Hoogt","dbl":0}]},{"id":1067383,"name":"Stede Broec 5","teamplayers":[{"id":2220119,"name":"J. Broer","subst":0},{"id":3031636,"name":"R. Pronk","subst":0},{"id":3031644,"name":"J. Neuvel","subst":0},{"id":3033183,"name":"P. Sijm","subst":0},{"id":3293759,"name":"T. Buijsman","subst":0}],"matchplayers":[{"id":3293759,"name":"T. Buijsman","dbl":1},{"id":3033183,"name":"P. Sijm","dbl":1},{"id":3031644,"name":"J. Neuvel","dbl":0}]}]}