JSON Wallet — Free Online JSON Editor & Formatter
A developer tool to format, validate, compare, repair and transform JSON data in your browser. Not a cryptocurrency wallet — JSON Wallet is a JSON editing and formatting tool for developers. No signup. No data sent to any server.
How do I format JSON online for free?
Paste your JSON into JSON Wallet and it instantly pretty-prints with proper indentation. No signup, no install — works entirely in your browser. Read the guide →
How do I validate JSON and find errors?
JSON Wallet shows a live ✓ Valid / ✗ Invalid badge as you type. Click the badge to see the exact line and position of the syntax error.
How do I add slashes or strip slashes in JSON?
Use the Escape button to add slashes to special characters, or Unescape to strip them. Essential when embedding JSON inside strings or SQL queries. Learn how →
How do I stringify or unstringify JSON?
Click Stringify to convert JSON to a string literal, or Unstringify to parse a stringified JSON string back to readable JSON. Useful for debugging API payloads.
How do I URL encode or decode text?
Use the URL Encode button to percent-encode special characters, or URL Decode to convert percent-encoded text back to readable form. Handy for query strings and API URLs.
How do I compare two JSON files online?
Paste one JSON in the left panel and another in the right, then click Compare. JSON Wallet highlights every addition, deletion and change side by side.
How do I fix broken or malformed JSON?
JSON Wallet's Repair tool automatically fixes missing quotes, trailing commas, unescaped characters and other common JSON errors in one click. See common errors →
What is the best free online JSON editor?
JSON Wallet is a free, browser-only JSON editor with multi-tab support, tree view, table view, diff compare, repair and transform. No data is ever sent to a server.
How do I view JSON as a tree or table?
Switch between Tree, Table and Text modes using the mode buttons in the editor toolbar. Tree mode lets you expand and collapse nested objects and arrays interactively.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight text format for storing and exchanging structured data. Read our beginner's guide →
Is JSON Wallet safe to use with sensitive data?
Yes. JSON Wallet runs 100% in your browser. No data is transmitted to any server, making it safe for sensitive API responses and configuration files.
A complete JSON toolkit that runs entirely in your browser
JSON Wallet is a free online JSON editor and formatter built for developers who work with JSON every day — debugging API responses, editing configuration files, inspecting log output, or cleaning up data exports. Everything happens locally in your browser: paste your JSON, work with it, and copy the result. Nothing is ever uploaded to a server, so even sensitive payloads stay on your machine.
What you can do with JSON Wallet
Format and beautify. Turn a single minified line into clean, indented, readable JSON automatically — or minify it back to one compact line when you need to ship it. See the step-by-step walkthrough in our guide on how to format and validate JSON.
Validate as you type. A live Valid / Invalid badge tells you instantly whether your JSON is well-formed, and when it is not, it points to the exact line and column of the first error so you are not hunting blind. If a message is unfamiliar, our reference on common JSON errors and how to fix them explains every one.
Explore with tree and table views. Large, deeply nested documents are hard to read as raw text. Switch to tree view to expand and collapse objects and arrays interactively, or table view to scan arrays of records like a spreadsheet and find the one field you care about.
Compare and diff. Paste two JSON documents side by side and highlight every addition, deletion and change between them — perfect for spotting what changed between two API responses or two versions of a config file.
Repair broken JSON. Trailing commas, single quotes, unquoted keys and unescaped characters are fixed automatically with one click, so you can recover data that would otherwise fail to parse.
Transform without leaving the page. Stringify and unstringify, escape and unescape, Base64 encode and decode, URL encode and decode, and strip HTML — all the fiddly conversions that come up when you move JSON between databases, logs, query strings and source code. Our guide on escaping and stringifying JSON explains when to reach for each.
Analyze size. The size analyzer breaks a document down property by property so you can see exactly what is making a payload heavy — invaluable before trimming a response or debugging a slow API.
Privacy by design — your data never leaves your device
Most online JSON tools send your data to a server to process it. JSON Wallet does not. The entire editor runs as client-side code in your browser, which means API responses containing tokens, internal configuration, and customer records are safe to paste here. You can read exactly how we handle data, cookies and analytics in our Privacy Policy.
Who JSON Wallet is for
Backend and frontend engineers use it to inspect and reshape API payloads. DevOps and platform engineers use it to validate configuration before a deploy. QA engineers diff responses to confirm a fix. Data analysts clean up exports before loading them. Students and people new to the format use it alongside our guides to learn how JSON works. If you touch JSON, it is built for you — no signup, no install, no cost.
Learn more about JSON
New to the format or want to go deeper? Our free, in-depth guides cover the essentials and the edge cases: