Version: 3.1
Operating System: macOS
Developer: Okapi Apps
Interface language: English
OK JSON
Copy a payload, press Command-V, and it opens as a browsable tree instead of one minified line in a browser tab.
Paste, repair, then walk the tree
The usual start is the clipboard. You can also drop a file, open one from disk, send selected text through the macOS Service "View in OK JSON," or load a document from a URL, including a curl command you already copied. JSON Lines, NDJSON, and property lists open as documents rather than as text you have to split yourself.
When the text is not strict JSON, the app can offer a repair pass for trailing commas, single quotes, and over-escaped strings. That is a convenience, not a promise: the vendor's terms say parsing and repair will not succeed on every file. The Navigator then shows structure, the Path Bar shows where you are, and zooming into a node keeps a huge response from becoming one endless scroll. The editor holds the formatted text. Change a value, undo if needed, and save back to the original file only when you mean to.
Space on a value previews timestamps as dates, colors as swatches, base64 as pictures, plus links, multiline text, and JSON stuffed inside a string. Command-F searches keys and values in the whole document or inside the focused node.
Queries, diffs, and small scripts
jq and JSONPath run in the same window, and saved filters keep a favorite query one click away on the next similar payload. Two documents can be compared, with the difference returned as a JSON Patch - useful when a staging body and a production body should match and do not.
JavaScript scripts cover transforms that a filter will not. They run locally under your user account, with APIs for text, files, alerts, and jq, so an unreviewed script can read or change files you point it at. AppleScript, a Raycast extension, and URL schemes can open the app from outside. In Finder, the Quick Look extension shows highlighted JSON on Space once it is enabled in System Settings.
Viewed documents land in a local history. Folders keep what you want; older entries can be left to expire. That helps when you bounce between endpoints, and it is a reason not to paste secrets you would rather not leave on disk.
Pretty-print habit, then the purchase
It suits people who keep dumping JSON into a website or a scratch buffer just to pretty-print it. It is a weak fit if you already live in a terminal jq pipeline, or if you need a full editor or a database browser. A URL fetch is the deliberate exception to the offline model: that request leaves the machine because you asked for it. Parsing, queries, and history do not. Anybox LTD states there is no account, no analytics, and no crash reporting.
The Mac App Store build is sandboxed and requires macOS 15 or later. The trial includes full functionality, collects no payment details, and does not charge when it ends. Afterward, Pro features need a one-time purchase; the store lists OK JSON Pro at $24.99, and major updates stay free while the app is still offered. The direct download matches the store build, with payment through Paddle. Release 3.1 adds Gruvbox themes and states support for macOS 27 on that same install floor.
Show full description Pros & Cons Show details
PROS[*]Pasting with Command-V, or dropping a file, opens a Navigator tree beside a formatted editor without a browser tab.
[*]Built-in jq, JSONPath, and JSON Patch, plus saved filters, keep repeated API checks inside one window.
[*]Pressing Space on a value turns timestamps, colors, base64 images, links, and JSON hidden in strings into a readable preview.
[*]Anybox LTD states there is no account, analytics, or crash reporting, and documents are not uploaded for parsing or history.
[*]A Pro purchase is one-time at the listed $24.99, and later major versions stay included while the app is offered.
[*]Finder Quick Look, the View in OK JSON service, Raycast, AppleScript, and URL schemes can open a payload without a manual import.
CONS[*]After the seven-day full trial, continued use of Pro features requires a one-time purchase rather than staying free.
[*]The current Mac App Store build requires macOS 15 or later, so earlier systems cannot install this release.
[*]Viewing history is saved on disk by default, so pasted API payloads remain until you file them or let old items expire.
[*]JavaScript scripts run with your user account permissions and can read or change files you point them at.
[*]Fetching JSON from a URL sends that request off the Mac, which breaks the otherwise offline workflow on purpose.
[*]Repair mode only attempts common breakage, and the vendor does not promise every invalid document will parse.
What's New in 3.1 Show details [*][macOS 27] - Adds support for macOS 27.
[*][Gruvbox themes] - Adds Gruvbox themes.
[*][Minor fixes] - Fixes some minor issues.
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OK JSON - Viewer & Formatter 3.1 for Mac (9 MB)
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