transformer.jolt.input
transformer.jolt.spec
formatter.output
JOLT Transform Online – JSON to JSON Transformation
Transform JSON structures using JOLT specifications. Reshape, rename, filter, and restructure JSON data without writing custom code.
 What is JOLT?
JOLT (JSON to JSON Transformation) is a library that allows you to transform JSON documents from one structure to another using a declarative specification.
This online JOLT transformer lets you paste your input JSON and JOLT spec, apply the transformation, and instantly see the output — no setup required.
Useful for:
  • jolt transform online tester
  • json to json transformation tool
  • test jolt spec online without Java
  • reshape json data structure
Why Use JOLT?
  • Rename JSON fields without custom code
  • Reshape API response structures
  • Filter and extract nested fields
  • Merge, shift, or default JSON values
  • Test JOLT specs quickly in the browser
Features
  • Three-panel editor: Input, Spec, Output
  • Format / Minify JSON in each panel
  • Word wrap toggle per panel
  • Sample input and spec loader
  • Download output as JSON file
Common Use Cases
Remapping API response fields
Transforming ETL pipeline payloads
Testing JOLT specs before deployment
Reshaping microservice data contracts
Extracting nested fields to root level
 How to Use
  1. Paste your input JSON in the left panel
  2. Enter your JOLT spec in the middle panel
  3. Click Transform
  4. View and copy the transformed JSON output
Related Tools
JSON FormatterJSON CompareJSON ValidatorJSON to HTML
 FAQ
What JOLT operations are supported?
The operations include shift, default, remove, cardinality, sort, and modify-overwrite-beta — the standard JOLT operation set.
Is this the same as the Java JOLT library?
Yes, JOLT was originally created by Bazaarvoice as a Java library. This tool uses a JavaScript port for in-browser transformation.
Is my JSON sent to a server?
No. All transformation is performed client-side in your browser. Your data never leaves your machine.
Transform JSON with JOLT Now
Reshape your JSON structure instantly — no Java, no setup, no fuss.
All Tools
Formatters
Validators
Transformers
Converters
Comparators