Online Jolt JSON Transform Tool

Test JSON-to-JSON mappings with Jolt

Jolt transforms JSON data according to a specification. This tool lets you place input, specification and output side by side to test how a mapping reshapes a document before using it in an integration.

Write a Jolt specification

Enter a JSON array of operation objects in Jolt Spec. Each operation needs an operation name and a spec property. The backend runs supported operations in sequence using Jolt Chainr, so the output of one step becomes the input to the next.

Start with a shift transformation

A shift specification maps input fields to output paths. The included example maps name to user.name and city to user.location. It is a useful starting point for renaming fields and building a nested output structure.

How to run a transformation

1. Paste a sample document into JSON Input and an operation array into Jolt Spec, or select Load Example.
2. Select Transform to validate the documents and send the request to the backend.
3. Inspect the Output and compare its structure and values with your expected result.
4. Adjust the specification and test again. Use Copy Output when the result is ready.

Test specifications before integrating them

Developers and API engineers can try mappings between service payloads, while testers can check representative inputs against expected output. Include samples with missing fields, empty arrays and nested values to see how your specification behaves beyond the simplest case.

Backend processing and sensitive data

JSON syntax is checked in your browser, but transformation sends both your input and specification to the DevBankTools backend. A working backend connection is required. Use synthetic or redacted examples and do not submit sensitive production data, credentials or personal information.