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Best Free JSON Formatters 2026: 6 Options Compared
Best free JSON Formatters compared: jq, fx, jless, JSON Crack and 2 more, with free-plan limits, platforms and prices from official pages checked October 23, 2026.
•3 min read•Code Editors, IDEs & Playgrounds
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Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| jq | Free (Free open-source software) | Command line (Linux, macOS, Windows) | Developers who format or filter JSON in scripts | Docs only |
| fx | Free (Free open-source software) | Command line | Exploring large JSON files in the terminal | Docs only |
| jless | Free (Free open-source software) | Command line | Reading JSON with a keyboard-driven viewer | Docs only |
| JSON Crack | Free (Free open-source software) | Web browser | Visualizing nested JSON structure | Docs only |
| JSON Formatter (browser extension) | Free (Free open-source software) | Chrome browser | Reading API responses in Chrome | Docs only |
| Visual Studio Code | Free (for private or commercial use per Microsoft's FAQ) | Windows, macOS, Linux, Web | Formatting JSON files in your editor | Docs only |
Independent comparison. Paid placements are labelled separately; editorial links earn no affiliate commissions. Learn more.
See the tools in action
Explore the interface and watch a workflow before choosing.
Good fit if
- You format JSON inside scripts (jq is the pick)
- You read big files in a terminal (fx is the pick)
- You want to see structure as a graph (JSON Crack is the pick)
- You inspect API responses in the browser (JSON Formatter (browser extension) is the pick)
Not ideal if
- You need paid-tier features, uptime guarantees or support that these free plans leave out
A JSON formatter takes a wall of minified text and makes it readable, and it often validates the syntax at the same time. You can solve that in a browser tab, in your terminal or in your editor, and the right tool depends on how often you do it and how sensitive the data is. For one-off cleanups, an in-browser viewer is quickest, and the JSON Formatter browser extension prettifies raw JSON responses as you open them. JSON Crack turns a document into an interactive graph, which helps when the structure is deeply nested. For repeated work or scripts, jq is the standard command-line tool: it filters, reshapes and pretty-prints JSON, though its query language takes some learning. fx and jless are terminal viewers that let you fold and search a document with the keyboard, which is easier than reading pretty-printed output when the file is large. VS Code formats JSON files with its built-in formatter, which is enough if you already work there. The trade-off is privacy. Pasting API responses or customer data into a random web page sends it to a server you do not control, so use an offline tool or the command line for anything sensitive. Check how a tool handles very large files, since browser formatters can freeze on multi-megabyte input.
jq
MIT-licensed command-line JSON processor. Pretty-prints, filters and reshapes JSON from the terminal or scripts, and runs offline. Its query syntax has a learning curve.
Price: Free (Free open-source software) (jq pricing, checked 2026-10-23).
Platforms and license: Command line (Linux, macOS, Windows). MIT (open source).
Project activity: 36k GitHub stars · latest release jq-1.8.2 (Jun 20, 2026) · last commit Oct 25, 2026
Best for: Developers who format or filter JSON in scripts.
Worth knowing: MIT text read from the COPYING file.
fx
MIT-licensed terminal JSON viewer and processor. Lets you collapse and search a large document with the keyboard, which suits files too big to read as plain text. Works offline.
Price: Free (Free open-source software) (fx pricing, checked 2026-10-23).
Platforms and license: Command line. MIT (open source).
Project activity: 20.7k GitHub stars · latest release 40.0.1 (Oct 22, 2026) · last commit Oct 22, 2026
Best for: Exploring large JSON files in the terminal.
Worth knowing: Terminal JSON viewer and processor per the repo description.
jless
MIT-licensed command-line JSON viewer for reading, exploring and searching data. Read-only navigation instead of transformation, so pair it with jq if you need to change the data.
Price: Free (Free open-source software) (jless pricing, checked 2026-10-23).
Platforms and license: Command line. MIT (open source).
Project activity: 5.5k GitHub stars · latest release v0.9.0 (Jul 17, 2023) · last commit Sep 7, 2026
Best for: Reading JSON with a keyboard-driven viewer.
Worth knowing: Command-line JSON viewer for reading, exploring and searching JSON per the repo description.
JSON Crack
Apache-2.0 web app that turns JSON, YAML, XML and CSV into interactive graphs. Good for seeing nested structure; the hosted site is online, so avoid pasting private data there.
Price: Free (Free open-source software) (JSON Crack pricing, checked 2026-10-23).
Platforms and license: Web browser. Apache-2.0 (open source).
Project activity: 44.6k GitHub stars · latest release v5.0.0 (Mar 11, 2026) · last commit Sep 14, 2026
Best for: Visualizing nested JSON structure.
JSON Formatter (browser extension)
BSD-3-Clause browser extension that makes raw JSON easier to read in the browser. Works on JSON you open directly, with no copy and paste into a website.
Price: Free (Free open-source software) (JSON Formatter (browser extension) pricing, checked 2026-10-23).
Platforms and license: Chrome browser. BSD-3-Clause (open source).
Project activity: 4.1k GitHub stars · latest release v0.8.0 (Sep 19, 2025) · last commit Sep 4, 2026
Best for: Reading API responses in Chrome.
Worth knowing: Repo describes it as making JSON easy to read.
Visual Studio Code
Free for private or commercial use per Microsoft's FAQ, with a built-in formatter for JSON files. Fine if you already edit in it; slower to start than a command-line tool for a quick check.
Price: Free (for private or commercial use per Microsoft's FAQ) (Visual Studio Code pricing, checked 2026-10-22).
Platforms and license: Windows, macOS, Linux, Web. Microsoft product license (source in the MIT-licensed Code - OSS repository).
Best for: Formatting JSON files in your editor.
Worth knowing: The downloadable product is under a Microsoft license; the MIT license covers the separate Code - OSS repository.
Compare: Visual Studio Code alternatives
Which one to pick
- You format JSON inside scripts: jq
- You read big files in a terminal: fx
- You want to see structure as a graph: JSON Crack
- You inspect API responses in the browser: JSON Formatter (browser extension)
Limits of this review
Docs-only for jq, fx, jless, JSON Crack, JSON Formatter (browser extension), Visual Studio Code: we did not install or run them, so feature claims come from vendor pages. Vendor prices and free limits change; confirm on the linked pricing page before you commit.
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Sources
Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing, license and product pages checked between 2026-10-22 and 2026-10-23: jq, fx, jless, JSON Crack, JSON Formatter (browser extension), Visual Studio Code. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.