🌐
JSONLint
jsonlint.com
JSONLint - The JSON Validator
JSONLint is the free online validator, json formatter, and json beautifier tool for JSON, a lightweight data-interchange format.
🌐
JSON Formatter
jsonformatter.org
Best JSON Formatter and JSON Validator: Online JSON Formatter
JSON Validator Online checks the integrity/syntax of the JSON data based on JavaScript Object Notation (JSON) Data Interchange Format Specifications (RFC).
Videos
05:53
🌐 YouTube
Build a JSON File Validator Linter and Formatter Online Tool in ...
January 24, 2021
07:11
🌐 YouTube
JSON Beginner Tutorial | How to validate JSON - YouTube
November 3, 2020
11:50
🌐 YouTube
JSON Schema Validation: How to Validate JSON Schema with Postman?
August 14, 2019
21.7K
03:26
🌐 YouTube
JSON Schema Tricks Every Developer Must Know - YouTube
June 27, 2023
04:10
🌐 YouTube
Build a JSON Editor to Format, Validate & Minify ...
June 30, 2025
02:42
🌐 YouTube
#28 JSON Validation Explained – How to Validate & Fix JSON Errors ...
May 3, 2025
View all
View all
People also ask
How do I validate JSON online?
Paste your JSON into the editor above. JSON Checker validates it instantly as you type or paste. Invalid JSON produces a clear error message with the exact line number where the problem occurs, so you can fix the JSON. Valid JSON is indented in place so you can read it. To pick the indentation, use the JSON formatter at https://jsonchecker.com/json-formatter. There is nothing to install and no button to press.
🌐
jsonchecker.com
jsonchecker.com
JSON Checker - The JSON Validator | Check JSON Online
What causes “Unexpected token” errors in JSON?
An “Unexpected token” error means the parser hit a character it wasn't expecting. The most common causes are: a trailing comma after the last item in an object or array, single quotes instead of double quotes around strings or keys, unquoted property names, a missing comma between items, or unescaped special characters inside a string. Paste your JSON above and the error message will point to the line where the parser stopped.
🌐
jsonchecker.com
jsonchecker.com
JSON Checker - The JSON Validator | Check JSON Online
How do I fix invalid JSON?
Start from the line number in the error message — the actual mistake is usually on that line or the one just before it. Check for missing or extra commas, mismatched brackets or braces, single quotes that should be double quotes, and unquoted keys. Fix one error at a time and re-validate; a single missing bracket can cascade into many misleading errors further down the document.
🌐
jsonchecker.com
jsonchecker.com
JSON Checker - The JSON Validator | Check JSON Online
🌐
JSON Formatter
jsonformatter.curiousconcept.com
JSON Formatter & Validator
In order to keep focused on providing the best JSON beautifier and validator online, we do not offer an offline version.
🌐
JSON Checker
jsonchecker.com
JSON Checker - The JSON Validator | Check JSON Online
Paste JSON to check it online. JSON Checker validates as you type and highlights the line when something is wrong.
🌐
Liquid Technologies
liquid-technologies.com › online-json-validator
Free Online JSON Validator
The Free Community Edition of Liquid Studio comes with an advanced JSON Editor, packed with many helpful features including JSON document validation.
🌐
Online JSON Editor
classic.online-json.com
Online JSON Formatter & Validator
Online-JSON Formatter & Validator, the best online tool available for real-time formatting, parsing, viewing, validating, editing, and beautifying of JSON data.
🌐
Beehosting
webtools.beehosting.pro › json-validator
Online Free JSON Validator - Beehosting Web Tools
December 14, 2023 - JSON Validator Online Tool. With our free JSON Validator, we make it easier for web developers and professionals to manage their projects on a day-to-day basis.
Find elsewhere
🌐
ReqBin
reqbin.com › json-formatter
Online JSON Formatter and Validator
August 29, 2026 - Formatting and validation run in the browser — nothing is uploaded until you press Save or Share · Upload JSON files into Online JSON Formatter & Validator from your disk
🌐
JSON Schema Validator
jsonschemavalidator.net
JSON Schema Validator - Newtonsoft
An online, interactive JSON Schema validator. Supports JSON Schema Draft 3, Draft 4, Draft 6, Draft 7, Draft 2019-09 and Draft 2020-12.
🌐
Json Parser Online
json.parser.online.fr
Json Parser Online
Analyze your JSON string as you type with an online Javascript parser, featuring tree view and syntax highlighting. Processing is done locally: no data send to server.
🌐
Scaler
scaler.com › home › topics › javascript › son validator | instant online syntax checker
JSON Validator and Formatter Online
JSON Validator and Formatter Online - ensure your JSON data is error-free with a JSON validator / Editor tool online on Scaler Topics. Check syntax, formatting and more.
🌐
JSONLint
jsonlint.vearne.cc
JSONLint - The JSON Validator
JSONLint is the free online validator and reformatter tool for JSON, a lightweight data-interchange format.
🌐
JSON Editor Online
jsoneditoronline.org
JSON Editor Online: edit JSON, format JSON, query JSON
JSON Editor Online is the original and most copied JSON Editor on the web. Use it to view, edit, format, repair, compare, query, transform, validate, and share your JSON data.
🌐
Reddit
reddit.com › r/json › built a free json inspector – view, format, validate & compare json online
r/json on Reddit: Built a Free JSON Inspector – View, Format, Validate & Compare JSON Online
August 10, 2025 -

Hey devs 👋,

I built a small tool called JSON Inspector to make working with JSON a bit easier.

Features:

  • View & format JSON with syntax highlighting and tree view

  • Validate JSON syntax instantly

  • Compare two JSON files side-by-side to spot differences quickly

  • Runs entirely in your browser – no data is sent to a server

  • Free

I made it because I kept switching between multiple tools for viewing, validating, and comparing JSON, now it’s all in one place.

Would love feedback from you all, especially if there’s a feature you’d want added!

Try it here: https://benshmuel.github.io/JsonInspector/

Top answer
1 of 1
1
If you work with web scraping, REST APIs, or data analysis, you probably deal with tons of JSON and JSONL files. And if you’ve tried to inspect or debug them, you know how annoying it can be to find a good viewer that: can handle malformed JSON, and supports JSONL (newline-delimited JSON). Most tools out there are either too basic (just a formatter) or too bloated (enterprise-level stuff). So… I built my own: 👉 JSON Treehouse ( https://jsontreehouse.com ) A free online JSON viewer and inspector built specifically for developers working with real-world messy data. 🧩 Core Features * 100% Free — no ads, no login, no paywalls * JSON + JSONL support — handles standard & newline-delimited JSON * Broken JSON parser — gracefully handles malformed or invalid files * Large file support — works with big data without freezing your browser 💻 Developer-Friendly Tools * Interactive tree view — expand/collapse JSON nodes easily * Syntax highlighting — color-coded for quick scanning * Multi-cursor editing — like modern code editors * Search & filter — find keys/values fast * Instant validation 🔒 Privacy & Convenience * Local processing — your data never leaves the browser * File upload support — drag & drop JSON/JSONL files * Shareable URLs — encode JSON directly in the link (up to 20 MB, stored for 7 days) *Dark/light mode 🧠 Perfect For * Debugging API responses, exploring web scraping results, checking data exports, or just learning JSON structure. 🚀 Why I Built It * I kept running into malformed API responses and giant JSONL exports that broke other tools. So I built JSON Treehouse to handle the kind of messy data we all actually deal with. I’d love your feedback and feature ideas! If you’re using another JSON viewer, what do you like (or hate) about
🌐
BetterBugs
betterbugs.io › development-tools › json-validator
JSON Validator Online - Developer Utility Tools
We cannot provide a description for this page right now
🌐
Jsongrid
jsongrid.com › json-validator
Json Validator Online - All-in-One Solution
Json Validator is an online tool to validate Json data format. This tool enables user to not only validates the Json but also directs to the errors in Json.
🌐
Neotechventures
rankmetric.neotechventures.in › tool › json-validator
Json Validator — RankMetric
We cannot provide a description for this page right now
🌐
FixTools
fixtools.io › home › json tools › json validator
JSON Validator Free Online Tool to Validate JSON Syntax | FixTools
Validate JSON syntax online. Free validator with instant error detection and clear messages.
🌐
Securebin
securebin.ai › tools › json-formatter
JSON Formatter and Validator Online: Format, Beautify, Minify (Free)
Format, validate, and beautify JSON instantly. Syntax highlighting, error detection, tree view, and minify. Free online JSON formatter.
🌐
Mmonestop
mmonestop.com › tool › json-validator
JSON Validator - Free Online JSON Syntax Checker — Free Online CyberTools - Web Utilities, Encoders, Converters & Security Tools
JSON Validator is the free online validator tool for JSON.