gwp_json_get

To extract a nested value from a JSON string submitted in a Gravity Form field, use the gwp_json_get merge tag. This modifier reads a JSON string, follows the given path, and returns the value  perfect for API responses or complex data structures.
Make sure:

– The JSON string is valid (no line breaks, properly formatted)

– The input field is a Single Line Text field

– The JSON path is correctly written (e.g., projects/0/Name)

Example:
{Input:9:gwp_json_get path="projects/0/Name" not_found="No project found"}

This returns “Project Alpha” when the submitted JSON looks like this:
{"projects":[{"Name":"Project Alpha","Status":"Active"},{"Name":"Project Beta","Status":"Completed"}]}

If gwp_json_get returns your not_found fallback value (or nothing at all), it’s often because:

– The JSON input has line breaks or is malformed
– The field type is Paragraph Text, which may insert unwanted characters
– The JSON path is incorrect or doesn’t match the structure

Fix: Use a Single Line Text field, paste a clean JSON string, and double-check your path.
Example fix:
{"projects":[{"Name":"Alpha"}]}

{Input:9:gwp_json_get path="projects/0/Name" not_found="Missing name"}

You can use the gwp_json_get modifier inside:

– The Default Value of another field (like a Hidden field)
– Confirmation messages
– Notifications
– Any place GravityWP Advanced Merge Tags are supported

It’s often paired with a Hidden field to extract data automatically from another field.
Example:
{Input:9:gwp_json_get path="projects/1/Name"}

Then show it later in a message:
Extracted Name: {Hidden Field:8}

No, it’s highly recommended to avoid line breaks. gwp_json_get expects a single-line, compact JSON string. Line breaks or improperly escaped characters will break parsing.

Instead of this:
{
  "projects": [
    {
      "Name": "Alpha"
    }
  ]
}

Use this:
{"projects":[{"Name":"Alpha"}]}


Use the GravityWP JSON Path Tool to automatically generate valid paths from a JSON string. This helps avoid mistakes like typos or missing array indexes.

Example path:
projects/0/Name

Paste your JSON into the tool, copy the path you need, and insert it into your merge tag like this:
{Input:9:gwp_json_get path="projects/0/Name"}