Jsonwebtoken Verify is causing a 500 server error in Express - express

Question

I'm trying to verify/decode JWTs in my application but am running into an issue, and I have no idea why. Here is the function which is supposed to achieve this, but is creating a 500 server error:
exports.index = (req, res, next) => {
let token = req.headers.authorization;
let decoded = jsonwebtoken.verify(token, process.env.SECRET);
console.log(decoded);
res.send(decoded);
}
req.headers.authorization is correctly storing and delivering the Bearer token, and process.env.SECRET is the same key that was used to sign the token. I am importing the jsonwebtoken library. I'm stumped. Any help is appreciated.
EDIT: Just wrapped the function in a try/catch and the error that is raised is:
JsonWebTokenError: invalid token
at Object.module.exports [as verify] (/Users/-------/repos/sosh/node_modules/jsonwebtoken/verify.js:75:17)
at exports.index (/Users/-------/repos/sosh/controllers/soshController.js:15:32)
at Layer.handle [as handle_request] (/Users/--------/repos/sosh/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/-------/repos/sosh/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/--------/repos/sosh/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/-------/repos/sosh/node_modules/express/lib/router/layer.js:95:5)
at /Users/-------/repos/sosh/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/Users/------/repos/sosh/node_modules/express/lib/router/index.js:335:12)
at next (/Users/-------/repos/sosh/node_modules/express/lib/router/index.js:275:10)
at Function.handle (/Users/------/repos/sosh/node_modules/express/lib/router/index.js:174:3)
I'm wondering why it says invalid token - I use this same token in my JWT authentication strategy and it works fine. Its formatted as "Bearer j5asdj........".