measureJsonPretty()

Description

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

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

Signature

size_t measureJsonPretty(TSource src);

Arguments

• src: the value to serialize. It can be a JsonDocument, JsonArray, JsonArrayConst, JsonObject, JsonObjectConst, JsonVariant, or JsonVariantConst.

Return value

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

Example

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

// Terminate headers
client.println();

// Send body
serializeJsonPretty(doc, client);

See also

• serializeJsonPretty()
• measureJson()