How to get a Token API with fetch

Question

I have to get a token from a URL for an API of "ile de France mobilité", I'm using Fetch and I don't understand how to do this. This is my actual code:

var client_id = "(my client_id)"; var client_secret = "(my client_secret)"; // var url_get = "https://traffic.api.iledefrance-mobilites.fr/v1/tr-global/estimated-timetable"; var grant_type = 'client_credentials' var token_url = 'https://as.api.iledefrance-mobilites.fr/api/oauth/token' var scope = 'read-data' const options = { method: 'POST', headers: { 'Content-Type' : 'application/x-www-form-urlencoded', }, body: { grant_type: grant_type, client_id: client_id, client_secret: client_secret, scope: scope } } const fetch_response = await fetch(token_url, options) const json = await fetch_response console.log(json) response.json(json)

And for answer I have

'Other stuff and :'

 [Symbol(Response internals)]: { url: 'https://as.api.iledefrance-mobilites.fr/api/oauth/token', status: 401, statusText: 'Unauthorized', headers: Headers { [Symbol(map)]: [Object: null prototype] }, counter: 0 } }

Does someone know how to do this?

In my index.html I call this script:

async function asyncCall() { const api_url = `/trajet` const response = await fetch(api_url, {method: 'POST'}) const json = await response //console.log(json) } asyncCall()

server:

const app = express() app.listen(3000, () => console.log('listening at 3000')) app.use(express.static('public')) app.use(express.json()) app.use(bodyParser.json())

and my route is: app.post('/trajet', async (request, response) => — scorval
– scorval, Commented Oct 6, 2020 at 9:34
and my route is irrelevant since your code never accesses that route - is the code you posted in a browser? It would be extremely odd (and insecure) if it is — Jaromanda X
– Jaromanda X, Commented Oct 6, 2020 at 9:43
so, anyway const json = await fetch_response should be const json = await fetch_response.json() for a start — Jaromanda X
– Jaromanda X, Commented Oct 6, 2020 at 9:44
don't post code in a comment - I think you misunderstand fetch response ... if response = await fetch then it isn't a Promise ... you need to use one of the methods like .text() or .json() etc to access response data — Jaromanda X
– Jaromanda X, Commented Oct 6, 2020 at 9:45

kavigun · Accepted Answer · 2020-10-06 09:58:59Z

HTTP Status Code 401 Unauthorized indicates that your request lacks valid authentication credentials. So there must be a problem in your body that you are sending.

Try sending the body in this format:

body: 'grant_type=client_credentials&client_id=' + key + '&client_secret=' + secret,

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