Functions for random data generation

[AntonShuvaev]

Problem to solve

I want to be able to use random data in requests like first name, last name, email, etc. Currently, we're limited to only newUuid and newDate functions.

Proposal

It would be great to have more random data generation functions besides existing newUuid and newDate. As an example, Postman has a great set of dynamic variables powered by faker.js (see docs: https://learning.postman.com/docs/tests-and-scripts/write-scripts/variables-list/). The fake-rs library (https://github.com/cksac/fake-rs) could be used for implementation.

I think it would be convenient to prefix such functions with $ to separate them from usual variables, as this is common in many API clients. For some functions, it would be even better to support arguments (e.g., $randomInt(123), $randomAlphaNumeric(10)). Or even support expressions so we can do things like this {{$randomFirstName + ' ' + $randomLastName}}

[jruot]

I'm having a similar problem. For example, I would like to pick a random value from a pre-defined list, such as a country code. It would also be good to define the date format for the newDate function.

[SilenLoc]

I would like to have it too but with a simple generation of random combinations of chars by sampling a vector:

{{randomChar(["2,A,4,e"],5)}}

would generate for example:

A22Ae

[techfg]

Having something like this would be extremely helpful. The existing newUuid and newDate are helpful but for fields that only accept certain characters, they often cannot be used when random/unique data is required.

The only solutions currently that I'm aware of are variables, variable-file, environment variables but these two are extremely limiting and add a dependency or CLI argument when you simply want to run a single file ad-hoc. The test itself should be capable of generating the dynamic data required.

As a starting point, having functions that generate a random set of letters, set of digits, etc. would be helpful, even adding a newEpoch/newTimestamp would give an easy way to get digits only. The approach postman takes for built-ins as @AntonShuvaev mentions would work well. As a starting point, some basic functions like randomAlphaNumeric, randomInt would solve a lot of the use cases I would suspect.

Ideally, there would be a way to define/provide hurl with a custom function that would allow all uses cases to be covered. For example, I could provide hurl a "randomUsername" function and when hurl sees {{randomUsername}} the function would be called. This approach, while ideal, would be more difficult to implement I suspect but it would meet all use cases without having to wait for hurl to add new built-in functions.

Appreciate the consideration!

Related #606

[truue]

please add the ability to save {{newUuid}} in a variable for use after the test. (create -> login)

[techfg]

please add the ability to save {{newUuid}} in a variable for use after the test. (create -> login)

@truue - If I'm understanding your ask, this already exists, you can assign {{newUuid}} to a variable via the options section. If this isn't what you are referring to, suggest you create a separate feature request issue in this repo since what you are asking for is separate to what #3720 is attempting to address. Thanks!

POST http://foobar.com
[Options]
variable: myid="{{newUuid}}"

[hemedani]

We need to add more (Functions, like Faker js, functions to create:

• Custom string
• Custom number
• Custom city and country name
• Custom Color, Food, Person, Address, Animal, Book, Email etc.

[matthiasschaub]

Would a PR be welcomed which implements a random number generator similar to the uuid generator (#3426)?

[chris-jamieson]

I took the opportunity to prepare a draft PR for this issue, as our team needs similar functionality

#5203

My knowledge of rust is limited so I used Claude Code to draft this (mindful of the contributing guidelines), although I have read it and tested it myself. Would anyone be willing to review the draft PR?