Cannot convert string map to json

Question

I'd like to make a json out of a hash received from redis using redigo:

func showHashtags(c *gin.Context) {
    hashMap, err := redis.StringMap(conn.Do("HGETALL", MyDict))
    if err != nil {
        fmt.Println(err)
    }    
    fmt.Println(hashMap) //works fine and shows the map 

    m := make(map[string]string)
    for k, v := range hashMap {
        m[k] = v
    }

    jmap, _ := json.Marshal(m)
    c.JSON(200, jmap)
}

However the result in browser is gibberish like:

"eyIgIjoiMiIsIjExX9iq24zYsSAiOiIxIiwiQWxsNFJhbWluICI6IjEiLCJCSUhFICI6IjMiLCJCVFNBUk1ZICI6IjIiLCJDTUJZTiAiOiIxI....

What is wrong here? How can I fix it?

Charlie Tumahai · Accepted Answer · 2018-07-04T20:25:35.000

6

The variable jmap is type []byte. The call to JSON encoder in c.JSON() marshals []byte as a base64 encoded string as you see in the output.

To fix the problem, use one level of JSON encoding by passing the map directly to c.JSON:

hashMap, err := redis.StringMap(conn.Do("HGETALL", MyDict))
if err != nil {
    // handle error
}    
m := make(map[string]string)
for k, v := range hashMap {
    m[k] = v
}

c.JSON(200, m)

Because hashMap is a map[string]string, you can use it directly:

hashMap, err := redis.StringMap(conn.Do("HGETALL", MyDict))
if err != nil {
    // handle error
}    
c.JSON(200, hashMap)

edited Jul 04 '18 at 20:25

answered Jul 04 '18 at 20:17

Charlie Tumahai

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Actually `c.JSON(200, hashMap)` also gives gibberish in the browser. It is worth mentioning that the dictionary are of Arabic words. – Karlom Jul 05 '18 at 02:33
The presence of Arabic words will not produce gibberish. What does `fmt.Printf("%#v\n", hashMap)` print? – Charlie Tumahai Jul 05 '18 at 06:01
Well, I realized I needed to convert the Marshaled json to string before sending it to browser: `s := string(jmap)` and then `c.JSON(200, s)` – Karlom Jul 05 '18 at 19:14

Cannot convert string map to json

1 Answers1