# JSON-Based input forms

### Introduction

Pipelines defined using the "Code" mode require an XML or JSON-based input form to define the fields shown on the launch view in the user interface (UI).

To create a JSON-based Nextflow (or CWL) pipeline, go to **Projects > your\_project > Flow > Pipelines > +Create > Nextflow (or CWL) > JSON-based**.

The files listed here, located on the inputform files tab, work together for evaluating and presenting JSON-based input.

* [**inputForm.json**](/connected-analytics/project/p-flow/f-pipelines/json-based-input-forms/inputform-json.md) contains the actual input form which is rendered when starting the pipeline run.
* [**onRender.js**](/connected-analytics/project/p-flow/f-pipelines/json-based-input-forms/onrender.js.md) is triggered when a value is changed.
* [**onSubmit.js**](/connected-analytics/project/p-flow/f-pipelines/json-based-input-forms/onsubmit.js.md) is triggered when starting a pipeline via the GUI or API.
* [**onFinish.js**](/connected-analytics/project/p-flow/f-pipelines/json-based-input-forms/onfinished.js.md) (optional, not automatically created) is triggered once the pipeline analysis has been completed

Use **+ Create** to add additional files and **Simulate** to test your inputForms.

Scripting execution supports crossfield validation of the values, hiding fields, making them required, .... based on value changes.


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