JSONBuddy

Free plan APIExtensionWindows

What JSONBuddy is

JSONBuddy is a toolkit for editing and validating JSON and JSON Schema, with tools for formatting, conversion, and automation. Its Windows editor offers text and grid views, schema-aware completion, and validation results. A separate schema editor assists with authoring, reference navigation, diagnostics, debugging, analysis, tests, and documentation. The validator checks JSON syntax and schema constraints, and identifies where invalid data relates to schema rules. Conversion tools work with JSON, CSV, XML, and HTML, including CSV imports and JSON-to-CSV output. Streaming validation handles large JSON without loading the whole document into memory; streaming JSON Schema checks through -jsv require a JSONBuddy Large Data license. Windows command-line tools run repeatable checks in scripts and CI, while the published Core API v1 supports formatting, minifying, JSON Patch, validation, and schema documentation. ValBuddy CLI performs file operations locally on Windows and can share selected diagnostics with an AI agent, though content or diagnostics may reach its model provider. Plans include a free personal and educational license and paid perpetual licenses.

Who it suits

JSONBuddy suits Windows users and developers who work with JSON or JSON Schema and need editing, validation, conversion, or scripted checks. The free license is limited to personal or educational use; commercial use is listed for paid plans.

What it does well

Text and grid editing with schema-aware completion.
Checks JSON syntax and JSON Schema constraints.
Converts among JSON, CSV, XML, and HTML.
Windows CLI supports scripts and CI checks.
Free personal and educational plan is available.

What to know first

Windows portable package requires Windows 10 or 11, 64-bit.
Streaming JSON Schema validation through -jsv requires a Large Data license.
ValBuddy diagnostics or selected content may reach an AI provider.

Limits

The free Personal and educational license is limited to personal or educational use. Streaming JSON Schema validation through -jsv requires a JSONBuddy Large Data license.

Plans

Plan	Billed and limits	Price
Personal and educational	Single-user perpetual license; free minor updates · Standard-like functionality; personal or educational use only; delivery terms need current confirmation	Free
JSONBuddy Swift	Single-user perpetual license · Windows editor; text and grid editing; auto-completion; validation; free minor updates; basic email support; commercial use	$15, paid once
.NET Class Library and C++ DLL	Single-developer perpetual license · Windows development; validation; documentation; formatting; JSON Patch; multiple JSON Schema drafts; free minor updates; basic email support; commercial use	$190, paid once
Visual Studio extension	Single-user perpetual license · Visual Studio; formatting; schema validation; HTML documentation; Schema Analyzer; free minor updates; basic email support; commercial use	$20, paid once
JSONBuddy Standard	Single-user perpetual license · Windows editor; CLI/CI; Web API; AI agents; free minor updates; extended email support; commercial use	$39, paid once
JSONBuddy Plus	Single-user perpetual license · Standard features; schema debugger; schema tests and coverage; validation profiling; large-file editing; free minor updates; extended email support; commercial use	$69, paid once

As json-buddy.com lists them, read 5 Oct 2026. The maker's own page has the final word.

Getting started

Visit the JSONBuddy website.
Choose a license for personal or educational use, Windows editing, Visual Studio, or development libraries.
Download the Windows portable ZIP if using the portable package; it requires 64-bit Windows 10 or 11.
Start the 14-day trial for the portable package or JSONBuddy Swift without registration.
Use the Windows editor, CLI, API, or extension according to the selected product.

Verdict

JSONBuddy combines visual editing, schema tools, conversions, and automation across its Windows, API, and extension offerings. Check the specific license: some features and commercial use are tied to paid plans.

Questions

Is JSONBuddy free?

A Personal and educational license is listed as free. It is for personal or educational use.

What do the paid licenses cost?

Listed one-time prices range from $15, paid once for JSONBuddy Swift to $190, paid once for the .NET Class Library and C++ DLL. Other listed options are the Visual Studio extension at 20.00 USD, Standard at 39.00 USD, and Plus at 69.00 USD, each per once.

Which platforms does it support?

The listed platforms are Windows, API, and extension. The portable package requires 64-bit Windows 10 or 11.

Does JSONBuddy offer a trial?

Yes. The Windows portable package and JSONBuddy Swift each offer a 14-day trial without registration.

Can it validate JSON Schema and process batches?

Schema validation and batch processing are listed. Streaming JSON Schema validation through -jsv requires a JSONBuddy Large Data license.

Who makes JSONBuddy?

The contact page names Clemens Uhlenhut and gives a Vienna, Austria address for JSONBuddy / xml-buddy.com.

Facts from JSONBuddy's own pages

Agent workflows: The ValBuddy CLI runs file operations locally on Windows and can return selected diagnostics to an AI agent; the agent may still send selected content or diagnostics to its model provider. · json-buddy.com, 5 Oct 2026
API: The published JSONBuddy Core API v1 supports JSON formatting and minifying, JSON Patch, schema validation, and schema documentation. · json-buddy.com, 5 Oct 2026
CLI and CI: The Windows CLI supports repeatable JSON and JSON Schema checks in scripts and CI and returns process status and diagnostics. · json-buddy.com, 5 Oct 2026
Contact and maker: The contact page names Clemens Uhlenhut and gives a Vienna, Austria address for JSONBuddy / xml-buddy.com. · json-buddy.com, 5 Oct 2026
Conversions: The product converts JSON, CSV, XML, and HTML, including CSV imports and JSON-to-CSV output. · json-buddy.com, 5 Oct 2026
Editing: The Windows editor supports text and grid views, schema-aware completion, and validation results. · json-buddy.com, 5 Oct 2026
File verification: The download page publishes an optional SHA-256 checksum for verifying the portable ZIP, and notes that Windows SmartScreen may warn because the executable is not signed. · json-buddy.com, 5 Oct 2026
Headquarters: Vienna, Austria · json-buddy.com, 28 Sept 2026
Large files: Streaming validation can process large JSON without loading the complete document into memory, and streaming JSON Schema validation through -jsv requires a JSONBuddy Large Data license. · json-buddy.com, 5 Oct 2026
Purpose: JSONBuddy provides tools to edit, validate, format, transform, and automate JSON and JSON Schema workflows. · json-buddy.com, 5 Oct 2026
Schema tools: The schema editor supports authoring assistance, reference navigation, validation diagnostics, debugging, analysis, tests, and documentation. · json-buddy.com, 5 Oct 2026
Support: The maker lists extended email support for Standard and Plus and basic email support for the extension, developer library, and Swift licenses. · json-buddy.com, 5 Oct 2026
Trial and download: The Windows portable package and JSONBuddy Swift each offer a 14-day trial without registration; the portable package is a 64-bit ZIP and requires Windows 10 or 11, 64-bit. · json-buddy.com, 5 Oct 2026
Validation: The validator checks JSON syntax and JSON Schema constraints and reports locations connecting failing data to schema rules. · json-buddy.com, 5 Oct 2026

Where JSONBuddy stands on Freedom251

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