Extracting access token from curl request in shell script

Question

Using a postman as a base, I have a curl request here and I'm trying to return the access token.

AUTHORIZATION=$(curl --location --request POST 'https://some.url/oauth2/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode "grant_type=$GRANT_TYPE" \
--data-urlencode "client_id=$CLIENT_ID" \
--data-urlencode "client_secret=$CLIENT_SECRET"\)

When I echo I get an output like:

{"access_token":"16WkRKbVpHWXlZekJsWVd...","token_type":"Bearer","expires_in":14400}

I want to extract the access_token and use in other parts of my script. I've tried the adding jq .access_token -r as seen below, but I'm just returning a null variable.

AUTHORIZATION=$(curl --location --request POST 'https://some.url/oauth2/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode "grant_type=$GRANT_TYPE" \
--data-urlencode "client_id=$CLIENT_ID" \
--data-urlencode "client_secret=$CLIENT_SECRET"\
-s \
| jq .access_token -r)

Solutions here: extract token from curl result by shell script advise saving to file and grepping on it. I don't really want to save a token to a file if I can avoid it.

Michal Trojanowski · Accepted Answer · 2022-03-04 08:26:22Z

1

It looks like you flipped the parameter name and value when calling jq. I think it should be:

jq -r .access_token

not jq .access_token -r

Other than that your solution looks fine.

answered Mar 4, 2022 at 8:26

Michal Trojanowski

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Ivar Alvarez · Accepted Answer · 2022-11-18 00:01:48Z

1

Step 1. Save the response in a variable

AUTHORIZATION=$(curl --location --request POST 'https://some.url/oauth2/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode "grant_type=$GRANT_TYPE" \
--data-urlencode "client_id=$CLIENT_ID" \
--data-urlencode "client_secret=$CLIENT_SECRET"\)

Step 2 use jq.

AUTHORIZATION = `jq '.access_token' <<< "$AUTHORIZATION"`

Step 3 eliminate the quotes.

AUTHORIZATION=`echo "$AUTHORIZATION" | tr -d '"'`.

edited Nov 18, 2022 at 0:01

answered Nov 17, 2022 at 23:41

Ivar Alvarez

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