Validate JSON and format it with consistent indentation.
An optional suggestion for your wider workspace: a security key can be used with online accounts that support it. This tool does not require one.
You do not need to buy anything to use this free tool.
As an Amazon Associate I earn from qualifying purchases.
A USB-C and NFC security key supporting FIDO2/WebAuthn and FIDO U2F authentication.
Check service and device support; this FIDO-only model does not provide OATH codes or PIV and cannot recover an unregistered account.
Links open external sites. Check the exact model and seller in Amazon results; prices and availability can vary by country.
Enter your values. Your result will appear here.
The link opens this page only. Your files, inputs and private results are not shared.
{"a":1} → indented JSON
Formatting preserves number literals, member order, duplicate keys and string escapes exactly; only whitespace outside strings changes. Nesting is limited to 100 levels; non-finite numeric ranges are rejected. Inputs are limited to 200,000 UTF-16 code units. Text is processed locally.
Image and text processing happens in your browser. Your files are not uploaded to our servers.
Valid JSON uses double quotes and does not allow comments or trailing commas. Check the error location. Compare large numeric identifiers with the original; represent identifiers as strings when your format permits.
Practical examples, settings and limits to help you finish the task.
Inspect JSON structure, duplicate keys and long identifiers before using the data.
Check quoted cells, headers and identifier strings before converting between CSV and JSON.
Use a four-record contact example to distinguish an omitted field, null, an empty string and a real value before a CSV export hides the difference.
Steps, limitations and sources · KitForma editorial guide
Steps, limitations and sources · KitForma editorial guide
Steps, limitations and sources · KitForma editorial guide
A silent walkthrough edited from real tool screens. The interface is Turkish; English and Turkish captions are available. This is not a continuous screen recording.
{"sku":"0012","orderId":9007199254740993,"active":true}The download includes a line/word counter, JSON formatter and CSV to JSON. Extract the ZIP and open index.html in your browser; these three tools work without a network.
Download the free offline packageThe embedded tool uses no account, tracking code or data sharing with its parent page. Test it in your layout and target devices before publishing.
No backlink, sign-up or payment is required. The package includes its MIT license.Allow optional analytics cookies? Your files and tool inputs are excluded.
Google Analytics + PostHog + Cloudflare Web Analytics
Tool starts, completions, errors and first download requests are measured. Sent: tool, language and a random temporary attempt ID. Inputs and results are never sent.
With your permission, KitForma also measures public pages, only general section names for private areas such as accounts, and selected action categories on its own server. These analytics are visible only to the site owner. A random tab identifier renews after 30 minutes of inactivity or at most 24 hours; measurement records are kept for up to 31 days. Account IDs, entered content, files, query text and private page addresses are not sent. Withdrawing consent stops these consented measurements.
A separate server counter keeps daily public HTML page access totals even when analytics is declined, without cookies, browser storage or person/session identifiers. This counter does not store IP addresses; network processing for page delivery still occurs. Anonymous counter scope and 31-day retention
With consent, a guide-to-tool click can be linked to that attempt’s result using only public guide/tool codes and a random click code. Fixed campaign labels and recognized referring-source categories can also be used; referring search terms and full addresses are excluded. This context stays in the same tab for at most 30 minutes; filenames, search text and account identity are excluded. Withdrawing consent clears it.
PostHog measures tool usage and technical error categories without personal content, and checks whether optional feedback is enabled. Survey answers are sent only when you submit them. Session replay and automatic click/form tracking are off; account details, files and entered content are excluded.
After consent, Cloudflare Web Analytics measures public page visits and loading times without analytics cookies. Account, support, billing and Etsy areas, URLs containing queries or fragments, and analytics tests are excluded. DNT/GPC signals block collection.
PostHog uses a random identifier stored only for this tab’s session, renewed after 30 minutes of inactivity or at most 24 hours. Withdrawing consent clears it and stops new measurement. An earlier Google Analytics choice does not grant permission for PostHog.
Privacy details