New config param: arrayFormat ?

Summary

Now when i send an array in GET request axios.get('/url', { id: [1, 2, 3] }) I receive this path: /url?id[]=1&id[]=2id[]=3 and it’s not configurable.

But some target servers (with strong typed languages) wants another format (without braces after param name): /url?id=1&id=2id=3

https://stackoverflow.com/questions/3061273/send-an-array-with-an-http-get

And now I have to use paramsSerializer (right this case is mentioned in README), and even to use another package (Qs).

But I found in buildURL function than brackets is added forcibly, and it’s quite easy to add options param to handle it.

https://github.com/axios/axios/blob/master/lib/helpers/buildURL.js#L43

Context

• axios version: 0.18.0
• Environment: chrome 65

[jasonsaayman]

On this I don’t think this should be implement as mentioned previously if you’d like to use another format, you can set a custom paramsSerializer as follows:

axios.defaults.paramsSerializer: function(params) {
  // return a query string
}

Using the qs library:

axios.defaults.paramsSerializer: function(params) {
  return qs.stringify(params, { indices: false }); // param=value1&param=value2
}

[pzanitti]

If there is no standard/RFC that defines this, why was it decided that [] should be used? I understand a custom paramsSerializer can be implemented, but the current implementation shouldn’t be opinionated.

I used this solution, unfortunately it requires an additional package for something that perhaps can be fixed with a simple toggle config. https://github.com/axios/axios/issues/559#issuecomment-264689998