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Showing content from https://arduinojson.org/v6/api/json/measurejson/ below:

measureJson() | ArduinoJson 6

Description

Computes the length of the minified JSON document that serializeJson() produces, excluding the null-terminator.

This function is handy to fill the Content-Length header in an HTTP message.

Signatures

size_t measureJson(const JsonDocument& doc);

Arguments

doc: the JsonDocument to serialize (in fact, you can also use a JsonArray, a JsonObject, or a JsonVariant).

Return value

The number of characters that serializeJson() produces, excluding the null-terminator.

Example

// Send headers
client.println("Content-Type: application/json");
client.print("Content-Length: ");
client.println(measureJson(doc));

// Terminate headers
client.println();

// Send body
serializeJson(doc, client);