Top 9 Must‑Use JSON Validation and Formatting Tools for Developers
This article introduces nine essential JSON tools—including online validators, CLI utilities, and IDE plugins—explaining their key features, how to access them, and why they help developers quickly validate, format, compare, and transform JSON data efficiently.
Introduction
JSON is easy for developers to use and easy for machines to parse and generate, which has attracted many tools for reformatting, validating, and parsing JSON, ranging from web‑based utilities to IDE plugins such as those for Visual Studio Code and Eclipse.
1. JSONLint
JSONLint, from CircleCell, is an online JSON validation and reformatting tool. Users can paste JSON, enter a URL, and optionally add ?reformat=compress to compress JSON.
Where to access JSONLint? https://jsonlint.com/ (source code on GitHub).
2. JSONCompare
JSONCompare, an advanced version of JSONLint, validates JSON directly, supports batch uploads, compares and merges two JSON objects, and offers simple, batch, and diff modes.
Where to access JSONCompare? https://jsoncompare.com/ (source code on GitHub).
3. JTC
JTC (JSON Test Console) is a CLI tool for extracting, processing, and transforming JSON. It can select elements, wrap them into new JSON, filter, or update them, and supports bulk changes via a single command. Binaries are available for Linux and macOS.
Where to download JTC? GitHub repository .
4. ijson
ijson, created in 2016, provides an iterator‑based JSON parser with a standard Python iterator interface. It can generate native Python objects from a JSON stream and offers C‑based (YAJL) and pure‑Python backends.
Where to download ijson? PyPI .
5. JSON Formatter & Validator
This online tool formats and beautifies JSON for easier reading and debugging, handling both raw JSON and URLs. It also offers a bookmarklet for quick validation of public JSON URLs.
Where to access the JSON Formatter & Validator? https://jsonformatter.curiousconcept.com/ .
6. Altova XMLSpy JSON & XML Editor
Altova XMLSpy is a JSON and XML editor that provides editing, modeling, transformation, and debugging tools, including a graphical schema designer, code generator, file converter, and debugger. It uses RaptorXML Server for JSON validation.
Where to download Altova XMLSpy? Altova website (free trial) .
7. Code Beautify JSON Tools
Code Beautify offers a suite of JSON utilities: viewer, editor, validator, and converters to HTML, XML, YAML, as well as an Excel‑to‑JSON converter and a minifier. It also supports many other data formats.
Where to access Code Beautify JSON Tools? https://codebeautify.org/json-tools .
8. Visual Studio Code
VS Code includes built‑in JSON support with IntelliSense for property/value validation, navigation, code folding, and suggestions. Hovering over JSON elements shows context based on the associated JSON schema.
Where to download Visual Studio Code? https://code.visualstudio.com/Download .
9. Eclipse JSON Editor Plugin
The free Eclipse JSON editor plugin provides syntax highlighting, code folding, formatting, and a synchronized tree view, complying with the RFC 4627 JSON standard.
Where to download the Eclipse JSON Editor Plugin? Eclipse Marketplace .
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