How Can Go\'s `encoding/json` Package Generate Human-Readable JSON Output?

Using Go's Encoding/JSON Package for Human-Readable JSON Output

You mention facing the challenge of producing human-readable JSON output when piping the results of your foo command through jq. While there are no known open-source jq wrappers specifically designed for this purpose, you can leverage Go's built-in encoding/json package to achieve the desired outcome.

Utilizing json.MarshalIndent() and Encoder.SetIndent()

The json.MarshalIndent() function provides a convenient way to encode a JSON value as a formatted string. By specifying the desired prefix and indentation, you can produce human-readable output. Similarly, json.Encoder's SetIndent() method allows you to establish indentation for your JSON output.

Example Code

Here's an example that demonstrates the usage of json.MarshalIndent():

package main

import (
    "encoding/json"
)

func main() {
    m := map[string]interface{}{"id": "uuid1", "name": "John Smith"}

    data, err := json.MarshalIndent(m, "", "  ")
    if err != nil {
        panic(err)
    }
    fmt.Println(string(data))
}

You can also use json.NewEncoder to control indentation:

package main

import (
    "encoding/json"
    "os"
)

func main() {
    enc := json.NewEncoder(os.Stdout)
    enc.SetIndent("", "  ")

    m := map[string]interface{}{"id": "uuid1", "name": "John Smith"}

    if err := enc.Encode(m); err != nil {
        panic(err)
    }
}

Formatting Pre-Generated JSON Text

If you have pre-generated JSON text, you can utilize the json.Indent() function to format it:

package main

import (
    "bytes"
    "encoding/json"
)

func main() {
    src := `{"id":"uuid1","name":"John Smith"}`

    dst := &bytes.Buffer{}
    if err := json.Indent(dst, []byte(src), "", "  "); err != nil {
        panic(err)
    }
    fmt.Println(dst.String())
}

By using these techniques, you can easily produce human-readable JSON output within your Go programs without the need for external jq wrappers.

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