Postman - use output from request in another request (i.e. JWT token)

postman_variables_chaining.md

Postman - use request output as input for another request

Let's assume we request a JWT token from one endpoint and want to use it as Bearer Token in another request to a different endpoint.

We can:

• 1. store the output (or part of it) in an environment variable

  • in the JWT request create a test and add some javascript. This selects the value of the JSON token {root}.token and stores it in a Postman env var token:

    token = pm.response.json().token;
    pm.environment.set("token", token);
    //console.log(pm.environment.get("token"));
    

    

• 2. we need to make sure an environment variable with this name exists in the currently selected Postman environment

  • in Postman in the top right corner click on the EYE button
  • if no environment is selected create a new one, else edit the existing one
  • in the environment settings create a variable named token and give it summy dummy initial value
  • click save
  • make sure the env is selected

• 3. we can use the variable anywhere in Postman with {{myvar}} - i.e. in the Authorization header

  • in our second request: Authorization -> Bearer and in the value field put {{token}}

Now run the first request, then the second. It should work as expected.

For debugging use console.log() and view -> open postman console

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Tags: Postman, Request Chaining, Request Piping, Piping, Chaining, Variable, Variables, Environment Variable, Pipe, API, Token, JWT