Insomnia After-Response Script Overview

Starting with the release of Insomnia 9.3.0, the concept of after-response scripts (also known as post-request scripts or test scripts in other applications) has been introduced. These scripts are executed following the completion of a request.

In after-response scripts, you can perform similar scripting activities as you would in pre-request scripts. For more details on pre-request scripts, see the documentation here.

These scripts can be utilized for:

• Performing tests and assertions on the response.
• Storing certain parts of the response into environment variables.
• Any other script you would apply in pre-request scripts.

For tests and assertions you can use insomnia.test and insomnia.expect functions:

insomnia.test('Check if status is 200', () => {
  insomnia.expect(insomnia.response.status).to.eql(200);
});

Here are some examples insomnia.expect calls you can make:

insomnia.expect(200).to.eql(200);
insomnia.expect('uname').to.be.a('string');
insomnia.expect('a').to.have.lengthOf(1);
insomnia.expect('xxx_customer_id_yyy').to.include("customer_id");
insomnia.expect(201).to.be.oneOf([201,202]);
insomnia.expect(199).to.be.below(200);

// Testing objects
insomnia.expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
insomnia.expect({a: 1, b: 2}).to.have.any.keys('a', 'b');
insomnia.expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
insomnia.expect({a: 1}).to.have.property('a');
insomnia.expect({a: 1, b: 2}).to.be.an('object').that.has.all.keys('a', 'b');

You can also access various response attributes:

const status = insomnia.response.status;
const responseTime = insomnia.response.responseTime;
const jsonBody = insomnia.response.json();
const textBody = insomnia.response.text();
const header = insomnia.response.headers.find(header => header.key === 'Content-Type');
const cookies = insomnia.response.cookies.toObject();

Example of storing response body parts into the environment:

insomnia.environment.set("whole_response", insomnia.response.json());

// Storing a specific field
const jsonBody = insomnia.response.json();
insomnia.environment.set("specific_field", jsonBody.specific_field);

Similar to pre-request scripts, after-response scripts allow for actions such as importing libraries, setting delays, and sending requests at the end of the script.

const atob = require('atob');

await new Promise((resolve) => setTimeout(resolve, 1000));

const resp = await new Promise((resolve, reject) => {
  insomnia.sendRequest(
    'https://mock.insomnia.rest',
    (err, resp) => {
      err ? reject(err) : resolve(resp);
    }
  );
});

Migrating from Postman post-request scripts

After-response scripts exported from Postman should also work when imported into Insomnia.

There are some differences to be aware about:

• Top level awaits are allowed.
• Global environment insomnia.globals and iteration data insomnia.iterationData are not supported yet.
• CollectionVariables is mapped to baseEnvironment in Insomnia.
• Deprecated postman interfaces are not supported yet, such as postman.setEnvironmentVariable.

If you notice any incompatibility issues, please report these by create a new issue on Github.