func TestDecoderSimple(t *testing.T) {
	var (
		counter int
		mv      *MetaValue
		body    = `[{"bio":"bada bing bada boom","id":1,"name":"Charles","falseVal":false}]`
	)

	decoder := NewDecoder(mkReader(body), 1)

	for mv = range decoder.Stream() {
		counter++
		t.Logf("depth=%d offset=%d len=%d (%v)", mv.Depth, mv.Offset, mv.Length, mv.Value)
	}

	if err := decoder.Err(); err != nil {

	err     error

	// follow line position to add context to errors
	lineNo    int
	lineStart int64
}

// NewDecoder creates new Decoder to read JSON values at the provided
// emitDepth from the provider io.Reader.
// If emitDepth is < 0, values at every depth will be emitted.
func NewDecoder(r io.Reader, emitDepth int) *Decoder {
	d := &Decoder{
		scanner:   newScanner(r),
		emitDepth: emitDepth,

	b.WriteTo(os.Stdout)
	// Output: Hello world!
}

func ExampleBuffer_reader() {
	// A Buffer can turn a string or a []byte into an io.Reader.
	buf := bytes.NewBufferString("R29waGVycyBydWxlIQ==")
	dec := base64.NewDecoder(base64.StdEncoding, buf)
	io.Copy(os.Stdout, dec)
	// Output: Gophers rule!
}

func ExampleBuffer_Bytes() {
	buf := bytes.Buffer{}
	buf.Write([]byte{'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'})

pkg encoding/asn1, func MarshalWithParams(interface{}, string) ([]uint8, error)
pkg encoding/csv, type ParseError struct, StartLine int
pkg encoding/hex, func NewDecoder(io.Reader) io.Reader
pkg encoding/hex, func NewEncoder(io.Writer) io.Writer
pkg encoding/json, method (*Decoder) DisallowUnknownFields()
pkg encoding/xml, func NewTokenDecoder(TokenReader) *Decoder
pkg encoding/xml, type TokenReader interface { Token }

					if err != nil {
						return err
					}
					buf := bytes.NewBuffer(nil)
					if _, err = msgp.CopyToJSON(buf, bytes.NewReader(b)); err != nil {
						return err
					}

					dec := json.NewDecoder(buf)
					// Use number to preserve integers.
					dec.UseNumber()
					var htr map[string]any
					if err = dec.Decode(&htr); err != nil {
						return err
					}
					ht[file.Name] = htr
				}
			}

	type opaResult struct {
		Result bool `json:"result"`
	}

	respBody := bytes.NewReader(opaRespBytes)

	var result opaResult
	if err = json.NewDecoder(respBody).Decode(&result); err != nil {
		respBody.Seek(0, 0)
		var resultAllow opaResultAllow
		if err = json.NewDecoder(respBody).Decode(&resultAllow); err != nil {
			return false, err
		}
		return resultAllow.Result.Allow, nil
	}

	return result.Result, nil

<img width="85%" src="https://bradley.codes/static/img/jstream-levels.gif" alt="jstream"/>

we can choose to extract and act only the objects within the top-level array:
```go
f, _ := os.Open("input.json")
decoder := jstream.NewDecoder(f, 1) // extract JSON values at a depth level of 1
for mv := range decoder.Stream() {
  fmt.Printf("%v\n ", mv.Value)
}
```

output:
```
map[desc:RGB colors:[red green blue]]

		MountPath: "/tmp/drive1",
		ID:        "uuid",
		Error:     "",
	}

	var buf bytes.Buffer
	gob.NewEncoder(&buf).Encode(v)
	encoded := buf.Bytes()
	b.Log("Size:", buf.Len(), "bytes")
	b.SetBytes(1)
	b.ReportAllocs()

	for b.Loop() {
		dec := gob.NewDecoder(bytes.NewBuffer(encoded))
		err := dec.Decode(&v)
		if err != nil {
			b.Fatal(err)
		}
	}
}

	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := k.client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	var accessToken Token
	if err = json.NewDecoder(resp.Body).Decode(&accessToken); err != nil {
		return err
	}

	k.Lock()
	k.accessToken = accessToken
	k.Unlock()
	return nil
}

// LookupUser lookup user by their userid.

	type opaResult struct {
		Result bool `json:"result"`
	}

	respBody := bytes.NewReader(opaRespBytes)

	var result opaResult
	if err = json.NewDecoder(respBody).Decode(&result); err != nil {
		respBody.Seek(0, 0)
		var resultAllow opaResultAllow
		if err = json.NewDecoder(respBody).Decode(&resultAllow); err != nil {
			return false, err
		}
		return resultAllow.Result.Allow, nil
	}

	return result.Result, nil