How do I send a JSON string in a POST request in Go

Question

I tried working with Apiary and made a universal template to send JSON to mock server and have this code   package main  import        encoding json       fmt       github com jmcvetta napping       log       net http     func main         url     http   restapi3 apiary io notes      fmt Println  URL  gt    url       s    napping Session       h     amp http Header       h Set  X-Custom-Header    myvalue       s Header   h      var jsonStr     byte          title    Buy cheese and bread for breakfast            var data map string json RawMessage     err    json Unmarshal jsonStr   amp data      if err    nil           fmt Println err             resp  err    s Post url   amp data  nil  nil      if err    nil           log Fatal err            fmt Println  response Status    resp Status        fmt Println  response Headers    resp HttpResponse   Header      fmt Println  response Body    resp RawText         This code doesn t send JSON properly  but I don t know why  The JSON string can be different in every call  I can t use Struct for this

User · Accepted Answer

I m not familiar with napping  but using Golang s net http package works fine  playground     func main         url     http   restapi3 apiary io notes      fmt Println  URL  gt    url       var jsonStr     byte    title   Buy cheese and bread for breakfast          req  err    http NewRequest  POST   url  bytes NewBuffer jsonStr       req Header Set  X-Custom-Header    myvalue       req Header Set  Content-Type    application json        client     amp http Client       resp  err    client Do req      if err    nil           panic err            defer resp Body Close        fmt Println  response Status    resp Status      fmt Println  response Headers    resp Header      body       ioutil ReadAll resp Body      fmt Println  response Body    string body

User · Answer

you can just use post to post your json    values    map string string  username   username   password   password   jsonValue       json Marshal values   resp  err    http Post authAuthenticatorUrl   application json   bytes NewBuffer jsonValue

User · Answer

If you already have a struct  import        quot bytes quot       quot encoding json quot       quot io quot       quot net http quot       quot os quot               type Student struct       Name    string  json  quot name quot       Address string  json  quot address quot                body     amp Student      Name      quot abc quot       Address   quot xyz quot      payloadBuf    new bytes Buffer  json NewEncoder payloadBuf  Encode body  req       http NewRequest  quot POST quot   url  payloadBuf   client     amp http Client   res  e    client Do req  if e    nil       return e    defer res Body Close    fmt Println  quot response Status  quot   res Status     Print the body to the stdout io Copy os Stdout  res Body   Full gist

User · Answer

In addition to standard net http package  you can consider using my GoRequest which wraps around net http and make your life easier without thinking too much about json or struct  But you can also mix and match both of them in one request   you can see more details about it in gorequest github page     So  in the end your code will become like follow   func main         url     http   restapi3 apiary io notes      fmt Println  URL  gt    url      request    gorequest New       titleList      string  title1    title2    title3       for    title    range titleList           resp  body  errs    request Post url               Set  X-Custom-Header    myvalue                Send    title       title                      End           if errs    nil               fmt Println errs              os Exit 1                    fmt Println  response Status    resp Status          fmt Println  response Headers    resp Header          fmt Println  response Body    body            This depends on how you want to achieve  I made this library because I have the same problem with you and I want code that is shorter  easy to use with json  and more maintainable in my codebase and production system

[json] How do I send a JSON string in a POST request in Go

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