> JSON Validator checks your JSON and repairs it when it's broken. Single quotes, trailing commas, comments, missing commas and files cut short are fixed… # JSON Validator JSON Validator checks your JSON and repairs it when it's broken. Single quotes, trailing commas, comments, missing commas and files cut short are fixed and marked, right on your PC. Fix the JSON on your clipboard with one shortcut, compare two files, and turn a sample into TypeScript, C# or a JSON Schema. $1.99 · lifetime · One payment. No subscription. 4.0 from 2 ratings ## See it in action ![Press Ctrl+Alt+J in any app to fix the JSON you just copied.](https://evlarsoft.com/apps/json-validator/s2.jpg) Press Ctrl+Alt+J in any app to fix the JSON you just copied. ![18 kinds of mistake, repaired and explained.](https://evlarsoft.com/apps/json-validator/s1.jpg) 18 kinds of mistake, repaired and explained. ![Compare two files and see what really changed.](https://evlarsoft.com/apps/json-validator/s7.jpg) Compare two files and see what really changed. ![TypeScript, C# and a JSON Schema from one sample.](https://evlarsoft.com/apps/json-validator/s3.jpg) TypeScript, C# and a JSON Schema from one sample. ![Check a whole folder of files against the schema.](https://evlarsoft.com/apps/json-validator/s4.jpg) Check a whole folder of files against the schema. ![Fold a long file down to its top-level keys.](https://evlarsoft.com/apps/json-validator/s6.jpg) Fold a long file down to its top-level keys. ## About JSON Validator Most JSON checkers tell you it's broken. JSON Validator fixes it. ## Broken JSON in, valid JSON out Paste, open or drop a file. It's checked as you type, and the mistakes people really make are repaired: single quotes, trailing commas, comments, names without quotes, missing commas and colons, Python's True, False and None, brackets that don't match and files that were cut short. That's 18 kinds of repair in all. Each one is marked in the editor with a short note, and listed beside it, so you can see exactly what changed. Then copy the fixed JSON or save it as a new file. ## Fix what you copy Copied a payload from a log or a chat? Press Ctrl+Alt+J in any app while JSON Validator is open. The JSON on the clipboard is repaired and formatted in place, and a notification tells you how many fixes it made. Paste it anywhere. You can pick your own shortcut. ## A proper editor Beautify with Shift+Alt+F, with an indent of 2 spaces, 4 spaces or tabs. Paste minified JSON into an empty editor and it arrives formatted. Fold everything down to the top-level keys, or fold any block from the gutter. Large files open read-only and stay fast. ## See what changed Compare two JSON files by content. Added, removed and changed values are listed by key path, and key order and spacing are ignored. Copy the report, or swap the two sides. ## Types from a sample Turn one example into TypeScript types, C# models for System.Text.Json and a JSON Schema. Then check a whole folder of .json files against that schema, or against a schema file of your own, and see why each failing file fails. ## Private Everything is checked on your PC. Nothing is uploaded, and there is no account. ## Features - Paste, open or drop JSON and it is checked as you type - Repairs broken JSON instead of just rejecting it: 18 kinds of mistake, from single quotes and trailing commas to comments, names without quotes, missing commas and Python's True, False and None - Closes a file that was cut short, so a truncated response or log line becomes valid JSON - Every repair is marked in the editor with a short note, and listed beside it. Click one to jump to it - When something can't be repaired, it shows the line and says what should come next - Copy the fixed JSON, or save it as a new file - Fix what you copy: press Ctrl+Alt+J in any app and the JSON on the clipboard is repaired and formatted in place, with a notification. Pick your own shortcut in Settings - Beautify with Shift+Alt+F, with an indent of 2 spaces, 4 spaces or tabs - Paste minified JSON into an empty editor and it arrives already formatted - Fold all down to the top-level keys, or fold any block from the arrows beside the line numbers - Indents for you as you type - Large files open read-only and stay fast, and you can still copy or save the fixed version - Compare two JSON files and see what was added, removed or changed, by key path - Key order and spacing are ignored, so only real differences show - Paste or type the second JSON, or choose a file. Swap sides and copy the report - Generate TypeScript types, C# models for System.Text.Json and a JSON Schema from one sample - Name the root type, then copy the result or save it as a file - Check a whole folder of .json files against the schema, or against a schema file you already have, and see why each one fails - Everything is checked on your PC. Nothing is uploaded - Light and dark themes, or match Windows ## Details Works on Windows 10 (1809 or later) and Windows 11 Download About 2.8 MB Version 2.0.2, updated October 2026 First released April 2023 Price $1.99, lifetime license. No subscription. Category Developer tools ## What's new in 2.0.2 - New: broken JSON is repaired, not just rejected, with every repair marked in the editor - New: press Ctrl+Alt+J in any app to fix the JSON on your clipboard - New: compare two JSON files and see what changed - New: generate TypeScript, C# and a JSON Schema from a sample, and check a folder against it - New: fold all, beautify with your choice of indent, and fast read-only viewing for large files ## Questions Anything else? [Ask us](https://evlarsoft.com/contact?topic=support&app=JSON%20Validator) ### Which versions of Windows does it run on? Windows 10 (version 1809 or later) and Windows 11. ### Is it a subscription? No. JSON Validator is a one-time purchase of $1.99, and updates are included. ### How do I get it? EvlarSoft apps are moving to direct downloads from this site. Ask to be notified and we will email you as soon as JSON Validator is ready to download. ## More from EvlarSoft [![](https://cdn.evlarsoft.com/related/v1/icons/self-signed-certificate-maker.png)**Self Signed Certificate Maker**Trusted HTTPS for localhost in one click.](https://evlarsoft.com/apps/self-signed-certificate-maker)[![](https://cdn.evlarsoft.com/related/v1/icons/easy-subnet-calculator.png)**Easy Subnet Calculator**Type an IP address and a prefix.](https://evlarsoft.com/apps/easy-subnet-calculator)[![](https://cdn.evlarsoft.com/related/v1/icons/regex-tester.png)**Regex Tester**Regex Tester reads your regular expression back in plain English, piece by piece, and lights up the matches in your own text or a whole folder of files.](https://evlarsoft.com/apps/regex-tester) --- Source: https://evlarsoft.com/apps/json-validator