A free JSONFormatter alternative that runs in your browser
Format, validate and diff JSON in the browser — with no save feature, which means no accidental public link holding your payload.
Both tools process locally — see the honest comparison below
Try it now: JSON Formatting
Regular formatted display of JSON, plus automatic formatting/conversion for API interface testing (GET, POST, POST-JSON).
This is the real tool, not a demo. Open JSON Formatting on its own page.
AltFTool vs JSONFormatter
JSONFormatter validates in the browser, exactly as we do, so there is no privacy edge to claim over them and we will not invent one. The difference is the save feature. Theirs is genuinely useful — a shareable URL for a formatted payload — but their own privacy policy warns in capitals not to save sensitive data, and anything saved while logged out is public. AltFTool has no save button at all. That is a missing feature, and for a payload with a token in it, a missing feature is the safer default.
| Comparison point | AltFTool | JSONFormatter |
|---|---|---|
| Where the work happens | File tools (PDF, image, converters) run in your browser and the file is not uploaded. Tools that need live data or a model — AI tools, language checkers, lookups — send your input to an API, and say so on their own page. | In the browser — their FAQ states JSON is validated client-side (same as AltFTool). |
| Account required | No — every tool opens and runs without signing in. | Not required to format; needed for private or long-lived saved links. |
| Free tier ceiling | — | No paid tier at all; saved links expire in 1–24 hours unless you log in. |
| Paid plans | None. There is no paid tier and no per-file metering. | None — /pricing returns 404 and no plan is offered. |
| Ads | Yes — ads are what keep the tools free. | Yes — ad-supported, with Google Analytics and Clicky tracking. |
| Desktop / mobile apps | Android only. AltFTool publishes a few free Android apps as APK downloads on its Apps page; there is no desktop app. | Web-based, no desktop app. |
| API & automation | No public API. Tools are interactive pages, not endpoints. | Not offered. |
JSONFormatter's free tier, in their own words
- No paid tier exists — the whole site is free and ad-supported; https://jsonformatter.org/pricing returns HTTP 404 and no pricing link appears anywhere in the site navigation
- Saved-link expiry without an account is limited to 3 options: 1 hour, 8 hours, or 24 hours
- Longer expiry — 7 days, 15 days, 30 days, and 'Never' — is gated behind login: each option is labelled '(Login Required)'
- Anything you save while logged out is public: 'If JSON data is saved without login, it will become public. To make json data private please login and save the links.'
- Their privacy policy carries an all-caps warning about the save feature: 'DO NOT SAVE SENSITIVE DATA USING THE SAVE FUNCTIONALITY.'
- Traffic is tracked by Google Analytics and Clicky Web Analytics, and Google 'may use the data it collects to contextualize and personalize the ads'
Checked on 2026-07-25 against the following sources, each opening in a new tab: jsonformatter.org/, jsonformatter.org/policy, jsonformatter.org/pricing. Vendors change their plans — if something here is out of date, trust JSONFormatter's own page over ours.
What JSONFormatter does better
Plenty of people should keep paying for JSONFormatter, and these are the reasons why.
- Formatting and validation genuinely run on your machine — their FAQ states 'Your JSON Data gets validated in the browser itself', so pasting a payload into the formatter does not ship it to their server. That is the same privacy posture AltFTool claims, and they earned it first.
- Shareable saved links are a real feature AltFTool has no equivalent for: you can save formatted JSON and send a colleague a URL, with expiry you choose (up to 'Never' with an account) and private visibility when logged in.
- One page does a lot without making you navigate between separate tools — format, validate, tree view, image preview on hover for image URLs, selectable 2/3/4-space indentation, and direct conversion to XML, CSV, and YAML.
And what AltFTool does not do
- No shareable saved links. You cannot hand a colleague a URL to a formatted payload — that is JSONFormatter's best feature and we have no equivalent.
- No single page that does everything. Format, diff, tree view and conversions are separate tools here, which is more navigation.
- No hover image preview for image URLs inside a payload.
Where each JSONFormatter job goes here
Left: what you clicked on JSONFormatter. Right: the tool that does the same job here.
- JSON Formatter / ValidatorJSON Formatting
- JSON Editor (tree view)JSON Editor
- JSON DiffJSON Compare
- JSON to YAMLJSON to YAML Converter
- JSON to CSVJSON to Excel/CSV Converter
- CSV to JSONCSV to JSON
The tools that cover JSONFormatter work
- JSON FormattingRegular formatted display of JSON, plus automatic formatting/conversion for API interface testing (GET, POST, POST-JSON).Open
- JSON EditorValidate, format, minify, and convert JSON snippets.Open
- JSON CompareCompare two JSON files, URL payloads, or text inputs side-by-side with semantic difference highlighting.Open
- JSON to YAML ConverterConvert JSON objects and arrays into readable YAML.Open
- JSON ParserParse JSON data and display it in a readable formatOpen
- CSV to JSONConvert CSV file or text into JSON formatOpen
- JSON to TypeScriptConvert JSON objects recursively into type-safe TypeScript interfaces or type statements with formatting options.Open
- JSON to Excel/CSV ConverterConvert pasted JSON or uploaded JSON files into clean CSV and Excel-ready spreadsheet downloads.Open
Questions people actually ask
- Is one of these more private than the other?
- Not for formatting. JSONFormatter validates client-side and says so, and so do we. The difference is that they offer a save feature which uploads the payload, and we do not offer one at all.
- Can I share a formatted payload from AltFTool?
- No. There is no save-and-share link. If you need that, JSONFormatter's saved links are the feature to use — just heed their own warning about sensitive data, and log in so the link is not public.
- Does AltFTool generate TypeScript types from JSON?
- Yes, that is a separate tool in the list below. JSONFormatter converts to XML, CSV and YAML; type generation is one place our toolset goes further.
Cite this page
APA, MLA, BibTeX
Quote anything on this page with a credit. The date below is the date this page's data was read, not the date you are reading it — cite it alongside any figure you take from here, because these numbers move.
- Canonical URL
- https://www.altftool.com/alternatives/jsonformatter
- Author and publisher
- AltFTool — no individual author is credited on this page.
- Vendor pages checked
- Read from
- JSONFormatterjsonformatter.org/ (+2 more pages from the same source, listed in full above)
APA
AltFTool. (2026, July 25). A free JSONFormatter alternative that runs in your browser. https://www.altftool.com/alternatives/jsonformatterMLA
"A free JSONFormatter alternative that runs in your browser." AltFTool, 25 July 2026, www.altftool.com/alternatives/jsonformatter.BibTeX
@misc{altftool-alternatives-jsonformatter,
author = {{AltFTool}},
title = {{A free JSONFormatter alternative that runs in your browser}},
year = {2026},
month = {jul},
howpublished = {\url{https://www.altftool.com/alternatives/jsonformatter}},
note = {Vendor pages checked 2026-07-25. Source: JSONFormatter: \url{https://jsonformatter.org/}.}
}Free-tier limits and prices are transcribed from the vendor's own pages on the date shown and are never converted between currencies, so quote that date alongside any figure you take from here. Vendors change their plans: if something here is out of date, trust JSONFormatter's own page over ours. The vendor links are plain links - no affiliate tracking, no referral IDs, no paid placement.