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title: ESP32 HTTP Client Code Examples & Arduino Sketches description: Collection of complete C++ code examples for ESP32-HTTP-Client: CRUD operations, struct serialization, JSON arrays, Auth headers, and error handling. keywords: ESP32 HTTP client code examples, Arduino ESP32 HTTP sketch, ESP32 REST API example C++, PlatformIO ESP32 sample code tags: - example - overview

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Examples

All examples are available in the examples/ directory and can be opened directly from the Arduino IDE via File → Examples → ESP32-HTTP-Client.

Example	Description
CRUD Operations	Full suite of REST methods (GET, POST, PUT, PATCH, DELETE) in a single sketch.
Struct <-> JSON	Bi-directional C++ struct to JSON serialization and deserialization.
URL Parameters	Dynamic path parameter replacement (/users/{id}) and query parameters.
Authentication	Authenticating requests using Bearer / JWT, HTTP Basic Auth, and API Key headers.
Callbacks & Errors	Request callbacks, timeouts, automatic retries, error handling, and runtime URL change.
Nested JSON	Extracting deeply nested fields using dot-notation paths.
Array JSON	Addressing specific elements of a JSON array by index.
Raw JSON	Capturing entire objects or sub-arrays into an Arduino String.
Unix Timestamp	Fetching a long Unix timestamp from a time API.
Custom Port	Connecting to a server running on a non-standard port.
SOAP Web Services	Consuming SOAP 1.1 and SOAP 1.2 web services with streaming XML responses.
SOAP Faults	Inspecting SOAP Fault codes, reasons, details, and callbacks.
GraphQL Queries	Running GraphQL queries and mutations with direct response field binding.
GraphQL Variables	Parameterizing GraphQL operations with typed variables and struct mappings.
GraphQL Errors	Inspecting GraphQL errors, locations, paths, and extensions while preserving data.
GraphQL Streaming	Consuming deferred incremental streams (multipart/mixed, @defer).
JSON-RPC Web Services	JSON-RPC 2.0 requests, positional/named parameters, notifications, and struct mapping.