What is JSONMaster used for?

JSONMaster is a developer toolkit for formatting, validating, repairing, converting and visualizing JSON, YAML, XML, CSV and TOML, plus PDF tools. It is a good fit for fixing malformed JSON from an API, converting CSV exports into JSON and generating typed models from sample data.

Yes. JSONMaster has a free plan.

Is JSONMaster open source?

No. JSONMaster is proprietary (closed-source) software and can't be self-hosted. In the Developer Tools category, open-source options include Visual Studio Code, Zed and code-server.

What are some alternatives to JSONMaster?

Other SaaS products in the Developer Tools category include JSON Viewer Pro, Data Mocker and ParseKit.

JSONMaster: features, pricing and alternatives

About JSONMaster

JSONMaster is a web toolkit for working with structured data. Its formatter handles JSON with AI-assisted syntax repair and validation, and a visualizer displays data as a tree, graph or table. Other tools include a JSON Path query engine, a diff checker, a random JSON generator and validators for YAML and XML.

Converters handle CSV and JSON in both directions, XML and YAML conversions, stringifying, schema generation and TOON output, and generators produce TypeScript, Python, Java and Zod code from JSON. A monitor tracks API health and performance in real time. A set of PDF tools adds merging, splitting, image to PDF, PDF to JPG or PNG, unlocking and securing.

Collaboration features include cloud save, comments and private sharing. The platform is described as free for developers, with a pricing page for other options. The core features it highlights are the formatter, visualizer, monitor, JSON Path and diff helper, with converters, generators, PDF tools and validators listed as extras.

Key features

AI-assisted JSON formatting and repair
Tree, graph and table visualizer
JSON Path query engine
Structural diff checker
Converters between JSON, CSV, XML and YAML
Code generation for TypeScript, Python, Java and Zod
PDF merge, split and conversion tools

Good fit for

Fixing malformed JSON from an API
Converting CSV exports into JSON
Generating typed models from sample data

Tags: json; formatter; validator; converter; developer-tools; pdf-tools; yaml

JSONMaster: questions and answers

What is JSONMaster used for?: JSONMaster is a developer toolkit for formatting, validating, repairing, converting and visualizing JSON, YAML, XML, CSV and TOML, plus PDF tools. It is a good fit for fixing malformed JSON from an API, converting CSV exports into JSON and generating typed models from sample data.
Is JSONMaster free?: Yes. JSONMaster has a free plan.
Is JSONMaster open source?: No. JSONMaster is proprietary (closed-source) software and can't be self-hosted. In the Developer Tools category, open-source options include Visual Studio Code, Zed and code-server.
What are some alternatives to JSONMaster?: Other SaaS products in the Developer Tools category include JSON Viewer Pro, Data Mocker and ParseKit.