Variable setting in postman

1. Variable （ overall situation / aggregate / Environmental Science ）

Variables allow us to store and reuse their values in requests or scripts , By saving values in variables , You can assemble , Environment or request .

For us to do interface testing , Another very important function .

stay postman The three commonly used variables are global variables , environment variable , Set variable .

（1.） Global variables ： Once global variables are declared , Global availability , in other words postman Any set in , This variable can be used in any request . Its scope is the largest .

（2.） environment variable ： To declare environment variables , First of all, the creation environment , Then variables can be created in the environment . If you want to use environment variables , You have to choose first ( Import ) This environment , So you can use variables in this environment . It should be noted that the environment can also create multiple . There can be multiple variables in each environment .

（3.） Set variable ： Set variables are set specific , That is to say, the declared variable must be based on a collection , Its scope of use is only valid for this collection .

Their scope ranges from large to small ： Global variables > Set variable > environment variable . When the same variable is declared in several different scopes , The smallest variable will be used in priority to make .

To use a value in a variable, simply 2 A step , They are defining variables and getting variables .

1. Defining variables （ Set a variable ）

2. Get variable （ Access variables ）

3. Define global variables and environment variables , Click the pinion in the upper right corner to pop up the following interface , You can define global variables or environment variables according to requirements .

4. Global variables and environment variables that have been defined , You can do a quick look

   

     Define set variables

5. Select a collection , Open to see more actions (...) menu , Then click Edit . choice “ Variable ” Tab to edit or add to collection variables         Get variable   

6. Define variables , Then you can use variables . It should be noted that , Get variables in different places , The rules of writing are also different .

   If you get the variable in the request parameter , Whether it's getting global variables , Or environment variables , Or set variables , The way to get it is the same writing rules ：{ { Variable name }}

7. The request parameters refer to ：URL,Params , Authorization , Headers , Body

8. Get environment variables ：pm.environment.get(‘ Variable name ’)

9. Get global variables ：pm.globals.get(' Variable name ')

10. Get collection variables ：pm.pm.collectionVariables.get.get(' Variable name ')

11. If it's where the code is written (Tests,Pre-requests Script) Get variable , Get different types of variables , The code is different , As follows ：

12. 

      Variables are used in a wide range of scenarios , For example, we will talk about Interface Association later , Variables are used in the pre request script