{"info":{"_postman_id":"efaa4a37-031f-4c74-9663-02471225dcd3","name":"Multi-request loop","description":"

This Collection gets a list of IDs, then loops through 3 POST requests that submit these IDs until there are none left.

The layout is as follows:

GET ID list: https://postman-echo.com/get

Description:

response contains an array of numbers to use as dummy data.

Test script:

Parse IDs out of JSON, and store them as an array
JSON.stringify() the array and store in an environment using pm.environment.set('key',value);
Store the length of the array in the environment

1st POST request: https://postman-echo.com/post?test1={{id}}

Description:

A request meant to do something with the IDs we get in the GET ID list request.
Also contains a pre-request script that is critical for looping through the data above

Pre-request script:

Check for/declare a counter variable in the environment using pm.environment.has('key'), and pm.environment.set('key',value) (this is so you can iterate through the array you stored when looping requests)
Parse the array stored in the environment, and set value for the {{id}} variable based on the index of the array you're iterating through
Increment your counter, and update the environment variable with the new value (pm.environment.set('key',value);)

2nd POST request: https://postman-echo.com/post?test2={{id}}

Description:

A request meant to do something with the IDs we get in the GET ID list request.

3rd POST request: https://postman-echo.com/post?test3={{id}}

Description:

A request meant to do something with the IDs we get in the GET ID list request.
Also contains a test script, which facilitates the looping of the 3 get requests in this Collection.

Test script:

Check the length of the parsed array against your counter variable, and if there are more indexes use postman.setNextRequest('request_name') to loop back to the 2nd request in the Collection.

\n","schema":"https://schema.getpostman.com/json/collection/v2.0.0/collection.json","toc":[],"owner":"5293839","collectionId":"efaa4a37-031f-4c74-9663-02471225dcd3","publishedId":"SWLiY5ab","public":true,"customColor":{"top-bar":"FFFFFF","right-sidebar":"303030","highlight":"EF5B25"},"publishDate":"2020-01-14T19:43:36.000Z"},"item":[{"name":"Get ID list","event":[{"listen":"test","script":{"id":"c78ebee0-0c48-4658-9f99-d78c237b5a0e","exec":["// Get array from reponse","var idArray = pm.response.json().args.idArray;","","// Get the length of the array","var idArrayLength = idArray.length;","","// Store the array length in the environment","pm.environment.set('idArrayLength',idArrayLength);","// Store the stringified idArray in the environment","pm.environment.set('idArray',JSON.stringify(idArray));"],"type":"text/javascript"}}],"id":"540122cc-d3bb-49cb-94d0-b8d8e370ce39","protocolProfileBehavior":{"disableBodyPruning":true},"request":{"method":"GET","header":[{"key":"Content-Type","name":"Content-Type","value":"application/json","type":"text"}],"body":{"mode":"raw","raw":"{\n\t\"idArray\":[1,2,3,4,5,6,7,8,9,0]\n}"},"url":"https://postman-echo.com/get","description":"

Description:

response contains an array of numbers to use as dummy data.

Test script:

Parse IDs out of JSON, and store them as an array
JSON.stringify() the array and store in an environment using pm.environment.set('key',value);
Store the length of the array in the environment

\n","urlObject":{"protocol":"https","path":["get"],"host":["postman-echo","com"],"query":[],"variable":[]}},"response":[],"_postman_id":"540122cc-d3bb-49cb-94d0-b8d8e370ce39"},{"name":"1st POST request","event":[{"listen":"prerequest","script":{"id":"3e11e9ae-865e-455b-96c4-e7fc40f0cd8b","exec":["//check to see if a counter variable has been declared, and if so ","if(!pm.environment.has('counter'))","{"," pm.environment.set('counter',0);","}","","//get the counter value","var counter = pm.environment.get('counter');","","//parse the array we stored in the 1st request, since it gets stored as a string","var idArray = JSON.parse(pm.environment.get('idArray'));","","//get the value of the idArray at the current iteration (counter)","var id = idArray[counter];","","//store an environment variable with the value of the current id","//the {{id}} variable in the URL of this request will end up resolving to this value","","pm.environment.set('id',id);","","//incremement the counter, and store it in the environment","counter++;","pm.environment.set('counter',counter);"],"type":"text/javascript"}},{"listen":"test","script":{"id":"8917ad00-3459-40df-9490-5a4e4185d669","exec":[""],"type":"text/javascript"}}],"id":"1bd9fc30-23f1-4c90-aefc-5fe12a72b2d5","protocolProfileBehavior":{"disableBodyPruning":true},"request":{"method":"POST","header":[],"url":"https://postman-echo.com/post?test2={{id}}","description":"

Description:

A request meant to do something with the IDs we get in the GET ID list request.
Also contains a pre-request script that is critical for looping through the data above

Pre-request script:

Check for/declare a counter variable in the environment using pm.environment.has('key'), and pm.environment.set('key',value) (this is so you can iterate through the array you stored when looping requests)
Parse the array stored in the environment, and set a value for the {{id}} variable based on the index of the array you're iterating through
Increment your counter, and update the environment variable with the new value (pm.environment.set('key',value);)

Description:

A request meant to do something with the IDs we get in the GET ID list request.

\n","urlObject":{"protocol":"https","path":["post"],"host":["postman-echo","com"],"query":[{"key":"test2","value":"{{id}}"}],"variable":[]}},"response":[],"_postman_id":"99abf49f-cc84-46ef-b495-070a1d05881e"},{"name":"3rd POST request","event":[{"listen":"prerequest","script":{"id":"3e11e9ae-865e-455b-96c4-e7fc40f0cd8b","exec":[""],"type":"text/javascript"}},{"listen":"test","script":{"id":"8917ad00-3459-40df-9490-5a4e4185d669","exec":["//get the counter value and array length","var counter = pm.environment.get('counter');","var arrayLength = pm.environment.get(\"idArrayLength\");","","//check to see if there are more indexes in the array to go through, and if so ","if (counter < arrayLength)","{"," postman.setNextRequest('1st POST request');","}","else","{"," postman.setNextRequest(null);","}"],"type":"text/javascript"}}],"id":"f17c28b3-5097-47a2-bce5-91611b17c06e","protocolProfileBehavior":{"disableBodyPruning":true},"request":{"method":"POST","header":[],"url":"https://postman-echo.com/post?test3={{id}}","description":"

Description:

A request meant to do something with the IDs we get in the GET ID list request.
Also contains a test script, which facilitates the looping of the 3 get requests in this Collection.

Test script:

Check the length of the parsed array against your counter variable, and if there are more indexes use postman.setNextRequest('request_name') to loop back to the 2nd request in the Collection.

\n","urlObject":{"protocol":"https","path":["post"],"host":["postman-echo","com"],"query":[{"key":"test3","value":"{{id}}"}],"variable":[]}},"response":[],"_postman_id":"f17c28b3-5097-47a2-bce5-91611b17c06e"}],"event":[{"listen":"prerequest","script":{"id":"1e4c04ba-e517-4280-b78e-4e3dd05347b8","type":"text/javascript","exec":[""]}},{"listen":"test","script":{"id":"a31f0dd5-2fbc-4d5c-bb87-81733b853207","type":"text/javascript","exec":[""]}}]}