JSONFix

Free online JSON formatter, validator and minifier with an AI Fix button that repairs broken JSON using Claude.

Free

Visit jsonfix-lake.vercel.app Compare coding

What is JSONFix?

JSONFix is a free web page for cleaning up JSON text. You paste your data, press a button, and the result appears in an output panel that is ready to copy. Format and Validate tidies valid JSON and flags what is wrong with invalid input, Minify strips whitespace for compact transport, and AI Fix sends broken JSON to Claude to be repaired. The site lists the kinds of damage it targets: missing or extra commas, single quotes in place of double quotes, unquoted property names, comments, trailing commas after the last element, missing brackets or braces, and truncated or incomplete JSON. These are the mistakes that make JSON.parse fail. No signup is needed, and the tool is free to use. It is useful for developers who receive malformed JSON from logs, config files or language model output and want a quick fix without editing by hand.

Use cases

Format and validate JSON
Fix JSON with trailing commas
Repair single-quoted JSON
Minify JSON for transport
Repair truncated JSON from LLM output
Strip comments from JSON

Who it's for

Software developers
QA engineers
Data analysts

Why use JSONFix

Fixes common syntax errors with one click instead of hunting for them line by line.
No account is needed, which keeps one-off cleanups quick.
Formatting, validating and minifying are on one page, so everyday JSON chores need no other tool.
Output appears instantly in a panel you can copy back into your code or config.

JSONFix features

Format and Validate button for JSON text
Minify option
AI Fix button that uses Claude to repair broken JSON
Handles missing or extra commas
Handles single quotes and unquoted property names
Handles comments and trailing commas
Repairs missing brackets or braces and truncated JSON
No signup required

JSONFix integrations

Claude

How to get started with JSONFix

Open the JSONFix page in your browser.
Paste your JSON into the input panel.
Choose Format and Validate, Minify, or AI Fix Broken JSON depending on what you need.
Read the result in the output panel and copy the corrected JSON.

JSONFix limitations

AI-repaired JSON should be checked to confirm it matches the data you intended
The site shows no API, file upload or saved history

JSONFix pricing

JSONFix is free to use.

Prices can change and may vary by country or exclude tax. Check the official pricing page.

JSONFix alternatives

The main JSONFix alternatives listed on Debuly are Recast, Butterfish, Katalon, WhereMyTokens, 16x Prompt and AI2SQL. The table compares pricing and platforms; order is A–Z.

JSONFix compared with its alternatives
Tool	Pricing	Starting price	Platforms
JSONFix	Free	—	Web
16x Prompt	Freemium	$48 one-time	macOS, Windows, Linux
AI2SQL	Freemium	$9/mo	Web, Windows, macOS, API
Butterfish	Open source	—	macOS, Linux, CLI
Katalon	Freemium	$1,000/yr	Windows, CLI
Recast	Pricing unknown	—	Web
WhereMyTokens	Open source	—	Windows, macOS

16x Prompt
Desktop app that builds coding prompts from your source files and instructions, then copies them or sends them to an LLM API.
Coding Developer platforms Productivity
FreemiumVisit 16x Prompt (official site)
AI2SQL
AI SQL assistant that turns plain-English requests into queries, explains and fixes SQL, and can run read-only queries on your own database.
Coding Productivity Developer platforms
FreemiumVisit AI2SQL (official site)
Butterfish
Free open-source tool that adds ChatGPT-style prompts, command autosuggest and an agent mode to your bash or zsh terminal.
Coding Developer platforms Productivity
Open sourceVisit Butterfish (official site)
Katalon
Test automation platform for web, mobile, API and desktop apps, with AI agents, self-healing tests and a free Katalon Studio tier.
Coding Automation and agents Developer platforms
FreemiumVisit Katalon (official site)
Recast
Browser tool that turns messy AI model output into clean, valid JSON and lists every fix it made in plain language.
Coding Developer platforms
Visit Recast (official site)
WhereMyTokens
Local-first Windows tray app that tracks Claude Code, Codex and Antigravity token use, quota windows and cost estimates.
Coding Productivity Developer platforms
Open sourceVisit WhereMyTokens (official site)

JSONFix FAQ

How much does JSONFix cost?

The site describes JSONFix as free and does not list any paid plans or prices.

Is there a free plan for JSONFix?

The whole tool is presented as free, and no signup is required to format, validate, minify or use AI Fix.

What kinds of JSON errors can JSONFix fix?

Its list covers absent or surplus commas, trailing commas, single quotes where double quotes belong, property names without quotes, comments, missing brackets or braces, and truncated JSON.

Does JSONFix use AI?

Yes. The AI Fix option relies on Claude to repair malformed JSON. Because the output is generated, compare it with your intended data before relying on it.

Who is JSONFix for?

It is aimed at developers, QA engineers and analysts who get malformed JSON from logs, config files or model output and want a fast cleanup.

What are alternatives to JSONFix?

Other options for formatting and repairing JSON include JSONLint, JSON Formatter, jsonrepair, Online JSON Viewer and your editor's built-in formatter. On Debuly, compare Recast, Butterfish and Katalon.

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Source	Type	Accessed
jsonfix-lake.vercel.app/	official	23 Oct 2026

Image credits

Logo: from jsonfix-lake.vercel.app · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
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