JsonObject::measurePrettyLength()
Description
Computes the length of the prettified JSON document that JsonObject::prettyPrintTo() produces, excluding the null-terminator.
This function is handy to fill the Content-Length header.
Signature
size_t measurePrettyLength() const Return value
The number of characters that JsonObject::prettyPrintTo() produces, excluding the null-terminator.
Example
// Send headers client.println("Content-Type: application/json"); client.print("Content-Length: "); client.println(root.measurePrettyLength()); // Terminate headers client.println(); // Send body root.prettyPrintTo(client); 