I have a json file (file.json) with following content:
file.json:
{"job": "developer"}
{"job": "taxi driver"}
{"job": "police"}
The contents of the file are exactly as above (not valid json file)
I want use data in my code but I can not Unmarshal This
What you have is not a single JSON object but a series of (unrelated) JSON objects. You can't use json.Unmarshal() to unmarshal something that contains multiple (independent) JSON values.
Use json.Decoder to decode multiple JSON values (objects) from a source one-by-one.
For example:
func main() {
f := strings.NewReader(file)
dec := json.NewDecoder(f)
for {
var job struct {
Job string `json:"job"`
}
if err := dec.Decode(&job); err != nil {
if err == io.EOF {
break
}
panic(err)
}
fmt.Printf("Decoded: %+v\n", job)
}
}
const file = `{"job": "developer"}
{"job": "taxi driver"}
{"job": "police"}`
Which outputs (try it on the Go Playground):
Decoded: {Job:developer}
Decoded: {Job:taxi driver}
Decoded: {Job:police}
This solution works even if your JSON objects take up multiple lines in the source file, or if there are multiple JSON objects in the same line.
You can read string line by line and unmarshal it:
package main
import (
"bufio"
"encoding/json"
"fmt"
"strings"
)
type j struct {
Job string `json:"job"`
}
func main() {
payload := strings.NewReader(`{"job": "developer"}
{"job": "taxi driver"}
{"job": "police"}`)
fscanner := bufio.NewScanner(payload)
for fscanner.Scan() {
var job j
err := json.Unmarshal(fscanner.Bytes(), &job)
if err != nil {
fmt.Printf("%s", err)
continue
}
fmt.Printf("JOB %+v\n", job)
}
}
Output:
JOB {Job:developer}
JOB {Job:taxi driver}
JOB {Job:police}
