3 Best JSON Editors for Mac (Free & Paid Options for 2025)

Finding a good JSON editor on Mac is weirdly harder than it should be. There are tons of options on Windows, but on macOS the choices thin out quickly, especially if you want something that actually feels native and doesn't hog your system resources.

I've tried quite a few over the years, everything from full blown code editors to little Mac App Store utilities. Most of them fall into one of two categories: either they're too heavy for simple JSON work (looking at you, VS Code), or they're so basic that they don't even validate your syntax.

These three are the ones I'd actually recommend. They cover different use cases, from casually browsing a JSON file to editing complex structures as a developer. One is free, one has a free version, and one costs about the price of a coffee.

What Actually Matters in a JSON Editor on Mac

Before getting into the tools, here's what I look for when evaluating a JSON editor, specifically on macOS.

Syntax highlighting is the baseline. If your editor doesn't color code keys, values, and brackets differently, you're going to have a bad time reading anything more than a few lines long.

Validation is right up there with highlighting. You want the editor to tell you immediately when something is broken. A missing comma or an unclosed bracket in a 200 line JSON file can take ages to find by eye, but a good editor will flag it for you in real time.

Tree view is a huge help for nested data. Being able to expand and collapse sections visually makes it far easier to navigate complex JSON structures compared to scrolling through raw text.

Beyond features, macOS integration matters more than people think. Apps built natively for Mac tend to launch faster, use less memory, respect system level settings (like light and dark mode), and just feel more polished. Cross platform Electron apps work fine, but you can tell the difference.

And with Apple Silicon being standard now, you want an editor that runs natively on M1/M2/M3 chips rather than through Rosetta translation. Performance is noticeably better with native support, especially for larger files.

1. OK JSON (Best for Quick Viewing and Formatting)

OK JSON is the app I reach for when I just need to quickly look at a JSON file, format it, or check if it's valid. It's available on the Mac App Store, it's completely free, and it's built specifically for macOS.

The interface is exactly what you'd expect from a well designed Mac app. It's clean, minimal, and supports both light and dark mode. You drop a JSON file in (or paste from your clipboard), and it instantly shows you a formatted, collapsible tree view alongside the raw text. You can switch between the two, copy individual keys or values, and copy the full path to any node, which is really handy when you're debugging API responses and need to reference a specific field.

One click formatting is the killer feature here. If someone sends you a minified JSON blob that's impossible to read, just paste it into OK JSON and it beautifies it instantly. Going the other direction works too if you need to minify formatted JSON before sending it somewhere.

Where OK JSON falls short is anything beyond viewing and formatting. There's no plugin system, no scripting support, and no schema validation. It's genuinely a viewer and formatter, not a full editor. You can make basic edits, but if you're doing heavy editing work on JSON files all day, you'll want something more capable.

That said, for the vast majority of situations where you just need to inspect, validate, or clean up a JSON file, OK JSON does the job quickly and without friction. The fact that it's free and works offline makes it an easy recommendation for anyone on a Mac.

2. Sublime Text + Pretty JSON (Best for Developers)

If you write code for a living and work with JSON regularly, Sublime Text paired with the Pretty JSON package is probably the best setup you'll find on Mac.

Sublime is the fastest text editor I've used on any platform. It launches almost instantly, even cold. It handles large files without flinching. And the editing experience is incredibly smooth thanks to features like multi cursor editing, Goto Anything (jump to any file, line, or symbol instantly), and a search engine that's genuinely fast across entire projects.

For JSON work specifically, Pretty JSON adds one click formatting and minification, JSON validation with clear error messages, and the ability to sort keys alphabetically. I use the formatting shortcut (Cmd + Ctrl + J) probably a dozen times a day. It also helps that Sublime's built in syntax highlighting for JSON is already excellent out of the box.

Setting it up takes about two minutes. Install Sublime Text, then install Package Control (Sublime's package manager) by following the instructions on their site. Once Package Control is installed, hit Cmd + Shift + P, type "Install Package," search for "Pretty JSON," and install it. That's it.

The free version of Sublime Text is fully functional. There's no feature lockout. It will occasionally show a dialog asking you to purchase a license, but you can dismiss it and keep working. If you use it daily and want to support the developer, the license is a one time purchase, which is nice compared to subscription models.

The main thing Sublime doesn't give you is a tree view. It's a text editor through and through. If you need to visually browse nested JSON structures, you'll need to use OK JSON alongside it or switch to a different tool for that specific task. But for raw editing speed and efficiency, nothing on Mac comes close.

3. CodeRunner (Best Lightweight IDE Alternative)

CodeRunner is a different kind of tool compared to the other two. It's a lightweight macOS native code editor that supports over 25 languages, and it happens to handle JSON beautifully.

What makes CodeRunner interesting for JSON work is that it's more than just a viewer or text editor. You can open a JSON file, edit it with full syntax highlighting and autocomplete, and then immediately run a script (Python, JavaScript, whatever) to process that data, all within the same app. That workflow of "inspect the JSON, write a quick script to transform it, run the script, check the output" is genuinely smooth in CodeRunner.

The interface is clean and Mac native. It uses tabs for managing multiple files, supports split views, and feels responsive even with larger files open. It also respects macOS conventions well, things like Dark Mode, native text rendering, and system keyboard shortcuts all work as expected.

CodeRunner costs about $15 as a one time purchase, which is reasonable for what you get. It's not trying to be VS Code or a full IDE. Think of it as a step up from a text editor but lighter than a development environment. If you frequently switch between JSON files and scripts, or if you're a student working across multiple languages, CodeRunner hits a sweet spot that's hard to find elsewhere.

The downsides are the lack of a plugin ecosystem and no built in tree view for JSON. You're working with raw text, same as Sublime. But the ability to execute code directly in the editor adds a dimension that neither OK JSON nor Sublime offers.

Quick Comparison

Feature	OK JSON	Sublime Text	CodeRunner
Price	Free	Free (basic)	$15
Syntax Highlighting	Yes	Yes	Yes
Schema Validation	No	Yes (plugin)	No
Tree View	Yes	No	No
Plugin Support	No	Yes	No
macOS Native	Yes	No	Yes
Run Scripts	No	No	Yes
Beginner Friendly	Yes	No	Yes

Frequently Asked Questions

Can I use VS Code for JSON editing on Mac?

You absolutely can. VS Code has excellent JSON support with extensions, and it's free. The reason I didn't include it in this list is that it's not Mac native (it's Electron based), it's heavier on resources, and there are already great Windows focused guides covering it. If you're already using VS Code for development, its JSON support is solid. But if you're looking specifically for something that feels great on macOS, the three tools above are better fits.

Do these editors work offline?

Yes. All three work completely offline. You don't need an internet connection to open, edit, view, or format JSON files with any of these tools.

Which JSON editor is completely free?

OK JSON is 100% free with no limitations. Sublime Text has a free version that's fully functional but shows occasional purchase prompts. CodeRunner is a paid app ($15 one time).

What's the easiest JSON editor for Mac?

OK JSON is the most approachable option. You open it, drop in your JSON, and it immediately shows you a formatted tree view. There's nothing to configure and no learning curve.

What about Atom?

GitHub officially sunset Atom, and while community forks exist, the project isn't actively maintained at the level it used to be. I'd recommend Sublime Text instead if you're looking for a similar style of editor with better long term support and significantly better performance.

Which One Should You Use?

If you're a developer who edits JSON files regularly alongside code, go with Sublime Text plus Pretty JSON. The editing speed and keyboard driven workflow are unmatched, and the free version has no real limitations.

If you just need to view, format, or validate JSON files occasionally, OK JSON is the pick. It's free, it's native, and it does those specific tasks better than any of the heavier editors.

If you want something in between, a clean Mac native editor where you can work with JSON and also run scripts, CodeRunner fills that niche well for a very reasonable price.

All three are worth having installed, honestly. I keep OK JSON around for quick inspections and Sublime for actual editing work. They complement each other well.

Other Editors Worth a Look

If none of the three above quite fit what you need, a few other options are worth mentioning:

VS Code is the most popular code editor in the world and handles JSON very well. It's heavier than the tools on this list, but if you're already using it for development, there's no reason to use a separate tool for JSON.

JSON Editor Online is a browser based tool that's great for one off tasks when you don't want to open an application.

jq is a command line JSON processor. If you're comfortable in the terminal, jq is incredibly powerful for filtering, transforming, and querying JSON data.