POSTMAN PRE-REQUEST-SCRIPT

 POSTMAN PRE-REQUEST-SCRIPT

POSTMAN provides many features for clubbing ,testing and running API through it. There are many features which can be handy while testing or developing REST APIs.

Pre-Request-Script feature is one the core feature which can be used for setting Token for subsequent request. We can make use of environment variable and set same in header in a collection.

Code snippet for same is ::

CASE 1: When request body contains raw data type.

pm.sendRequest({

url: 'http://localhost:8080/authenticate',

method: 'POST',

header: 'Content-Type:Application/json',

body: {

mode: 'raw',

raw: JSON.stringify({

"username":"admin",

"password":"password"

})

}

}, function (err, res) {

console.log(res.json());

pm.environment.set("authorization", "Bearer " + res.json().token);

});

Now in any request we can set header by setting key and value as "Authorization"  {{authorization}} 

CASE 2: When request body contains formdata type.

const reqObj = {

'method': 'POST',

'url': 'http://localhost:8080/authenticate/token',

'body': {

'mode': 'formdata',

'formdata': [

{'key':'grant_type', 'value':'password'},

{'key':'client_id', 'value':'2'},

{'key':'scope', 'value':'*'},

{'key':'client_secret', 'value':'Tjkjkjk'},

{'key':'username', 'value':'anoop'},

{'key':'password', 'value':'password'}

]

}

};

pm.sendRequest(reqObj, (error, response) => {

if (error) throw new Error(error);

console.log(response.json().access_token);

pm.environment.set("TOKEN",response.json().access_token);

});

Similar to the above request , in this also we can set value dynamic with {{TOKEN}}

CASE 3: Can also add below code under Test tab and set Collection Variable as X-Auth-Token useful for all the request under collection.

var res = pm.response.json();

pm.environment.set('X-Auth-Token', res.access.token.id);

pm.collectionVariables.set('X-Auth-Token',res.access.token.id);

console.log(res.access.token.id);