Are interpolations in workers secret supported??

jack_black_000 · 2025-11-22T14:06:54.467Z

Are interpolations in .env file get processed when uploaded using `wrangler secret bulk` command? My .env file contains ``` VAR_A=variable_a VAR_B=${VAR_A}/variable_b ``` would `VAR_B` results to `variable_a/variable_b`?

T

TK•11/22/25, 11:21 PM

No, this would come through with the value

${VAR_A}/variable_b

${VAR_A}/variable_b

${VAR_A}/variable_b

${VAR_A}/variable_b

T

TK•11/22/25, 11:21 PM

I've not encountered this use case before, can you give me a bit more detail on how you would use the feature? Examples of it elsewhere?

J

jack_black_000OP•11/23/25, 3:19 AM

I have an app which is an Oauth client. I use variables for urls like:

CLIENT_BASE_URL=https://app.com/
CLIENT_LOGIN_CALLBACK=${CLIENT_BASE_URL}login/callback
CLIENT_LOGOUT_CALLBACK=${CLIENT_BASE_URL}logout/callback

PROVIDER_BASE_URL=https://oauth.provider.com/
PROVIDER_AUTHORIZE_URL=${PROVIDER_BASE_URL}authorize
PROVIDER_TOKEN_URL=${PROVIDER_BASE_URL}oauth/token

CLIENT_BASE_URL=https://app.com/
CLIENT_LOGIN_CALLBACK=${CLIENT_BASE_URL}login/callback
CLIENT_LOGOUT_CALLBACK=${CLIENT_BASE_URL}logout/callback

PROVIDER_BASE_URL=https://oauth.provider.com/
PROVIDER_AUTHORIZE_URL=${PROVIDER_BASE_URL}authorize
PROVIDER_TOKEN_URL=${PROVIDER_BASE_URL}oauth/token

CLIENT_BASE_URL=https://app.com/
CLIENT_LOGIN_CALLBACK=${CLIENT_BASE_URL}login/callback
CLIENT_LOGOUT_CALLBACK=${CLIENT_BASE_URL}logout/callback

PROVIDER_BASE_URL=https://oauth.provider.com/
PROVIDER_AUTHORIZE_URL=${PROVIDER_BASE_URL}authorize
PROVIDER_TOKEN_URL=${PROVIDER_BASE_URL}oauth/token

CLIENT_BASE_URL=https://app.com/
CLIENT_LOGIN_CALLBACK=${CLIENT_BASE_URL}login/callback
CLIENT_LOGOUT_CALLBACK=${CLIENT_BASE_URL}logout/callback

PROVIDER_BASE_URL=https://oauth.provider.com/
PROVIDER_AUTHORIZE_URL=${PROVIDER_BASE_URL}authorize
PROVIDER_TOKEN_URL=${PROVIDER_BASE_URL}oauth/token

Currently I have 2 workarounds:

Do interpolations in the code. Ex:
```
fetch(env.PROVIDER_BASE_URL + env.PROVIDER_AUTHORIZE_PATH)
```
fetch(env.PROVIDER_BASE_URL + env.PROVIDER_AUTHORIZE_PATH)
```
fetch(env.PROVIDER_BASE_URL + env.PROVIDER_AUTHORIZE_PATH)
```
fetch(env.PROVIDER_BASE_URL + env.PROVIDER_AUTHORIZE_PATH)

Resolve the interpolations before uploading using

wrangler secret bulk

wrangler secret bulk

. Ex:

set -a; source .env; set +a;
envsubst < .env > .env.upload
wrangler secret bulk .env.upload

set -a; source .env; set +a;
envsubst < .env > .env.upload
wrangler secret bulk .env.upload

set -a; source .env; set +a;
envsubst < .env > .env.upload
wrangler secret bulk .env.upload

set -a; source .env; set +a;
envsubst < .env > .env.upload
wrangler secret bulk .env.upload

right now I prefer the 2nd solution.

Are interpolations in workers secret supported??

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