Decode JSON into a typed struct.

Decode JSON into a typed struct using a complete Go program with explicit sample inputs.

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    var item struct { Name string `json:"name"`; Count int `json:"count"` }
    if err := json.Unmarshal([]byte(`{"name":"tea","count":3}`), &item); err != nil { panic(err) }
    fmt.Println(item.Name, item.Count)
}

Expected output EXAMPLE

tea 3

Details

Save as main.go and run go run main.go with Go 1.26 or later. Uses only the Go standard library. Work in a scratch directory for file examples.

✓ Verified

Tested on Ubuntu 24.04.3 LTS · 2026-11-02 18:53:45 UTC · go version go1.26.9 linux/amd64 · Go standard library

Test inputs, results and environment

The exact published code ran in a dedicated Linux test container with prepared inputs. Dedicated test container, external networking disabled, read-only root, temporary per-example working directory. Browser network requests are blocked. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.

Architecture / host kernel: x86_64 / 6.18.54.1-microsoft-standard-WSL2
Snippet identity / locale: uid=65534, gid=65534 (unprivileged) / C.UTF-8
Interpreter invocation: go run main.go
Container image ID: sha256:c9bce90110f636fe04907469a37e9c8ac888171fd569cbf87101743ec7cdf099
Code SHA-256: 09540ebcdf55bb920d400b04ec02d0247cc0555ae098bf0e8911ab81b52c5b17
Dependencies: Go standard library

Test input setup

These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.

# No input files required.

Observed standard output

tea 3

Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.

Additional assertions that passed

Checks recorded by the test harness. Where Python assertions are shown, browser cases use Playwright and simulator cases may inspect pin transitions: result.stdout is captured output, work is the temporary directory, and Path is pathlib.Path. The harness also imports json and csv.

Exact stdout comparison; process returned zero without stderr.