Send POST request in Google Apps Script with Headers and Body

Question

I am trying to send a POST request in order to receive an Access Token in return.

The documentation is as follows:

Client Credentials

This is your first route to obtain an access_token to communicate with the API.

Route : POST https://api.helloasso.com/oauth2/token

Headers

Content-Type = application/x-www-form-urlencoded

Body

client_id = Your Client Id

client_secret = Your Client Secret

grant_type = client_credentials

Solution I tried

Based on this post, I tried the following code:

function qwe() { const url = 'https://api.helloasso.com/oauth2/token'; const headers = { "client_id": "Your Client Id", "client_secret": "Your Client Secret", "grant_type": "client_credentials" }; const options = { 'method' : 'post', 'contentType': 'application/x-www-form-urlencoded', 'headers': headers }; const response = UrlFetchApp.fetch(url, options); var data = JSON.parse(response); Logger.log(data); }

Upon running this, I get an error "Exception: Request failed for https://api.helloasso.com returned code 400. Truncated server response: {"error":"unauthorized_client","error_description":"client_id is not set"}".

I am a beginner, and would appreciate any help on this! Thank you in advance

Can you provide the documentation for https://api.helloasso.com because this looks like it needs the Client ID to complete the authorization — Century Tuna
– Century Tuna, Commented Mar 10, 2022 at 22:33

Tanaike · Accepted Answer · 2022-03-11 00:25:06Z

Modification points:

In the case of UrlFetchApp, the default content type is application/x-www-form-urlencoded.
From your question and situation, I guessed that your Body might be required to be sent as form data.

If those points are reflected in your script, it becomes as follows.

Modified script:

function qwe() { const url = 'https://api.helloasso.com/oauth2/token'; const data = { "client_id": "Your Client Id", "client_secret": "Your Client Secret", "grant_type": "client_credentials" }; const options = { 'method': 'post', 'payload': data }; const response = UrlFetchApp.fetch(url, options); console.log(response.getContentText()) }

Note:

If you tested this modified script, when an error occurs, please show the detailed error message and provide the official document. By this, I would like to confirm it.

Reference:

fetch(url, params)

@lexiconkatu Thank you for replying and testing it. I'm glad your issue was resolved. Thank you, too.

Neo · Accepted Answer · 2022-10-27 19:59:13Z

1

Need to make it stringify first

'payload' : JSON.stringify(data)

edited Oct 27, 2022 at 19:59

Neo

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answered Oct 16, 2022 at 5:57

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1 Comment

Joao Ferreira Over a year ago

I kiss your eyes <3

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