Box API: refresh the developer token instead of re-authorizing daily

TL;DR

The token response already includes a refresh token - store it securely and exchange it for a new access token whenever an API call comes back 401 Unauthorized.

Steps

1. When a Box developer token keeps expiring on you, stop re-running the authorization flow. The token response already includes a refresh token - store it securely and exchange it for a new access token whenever an API call comes back 401 Unauthorized. That gives you unattended access without the browser step. Only fall back to full re-authorization if the refresh token itself is rejected.

When to use

You are seeing this: When a Box developer token keeps expiring on you, stop re-running the authorization flow. Use this skill when you run into "Box API: refresh the developer token instead of re-authorizing daily".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Source: Stack Overflow #21613359 (accepted answer, 8 votes): the asker had folder access but the developer token expired after an hour, and re-doing the browser authorization flow daily was impractical. The accepted answer: the token response includes a refresh token alongside the access token. Store the refresh token somewhere secure and use it to get a fresh access token when the old one expires, which you can detect from a 401 Unauthorized on any API request.

Verified resolution: When a Box developer token keeps expiring on you, stop re-running the authorization flow. The token response already includes a refresh token - store it securely and exchange it for a new access token whenever an API call comes back 401 Unauthorized. That gives you unattended access without the browser step. Only fall back to full re-authorization if the refresh token itself is rejected.

Source URL: https://stackoverflow.com/questions/21613359/how-to-get-an-access-token-without-box-s-authorization-page