FORMAT
You sent a client a JSON file
They opened it in Notepad, edited the wrong field, and broke the entire structure.
JSON editor for humans
Stop sending JSON files into the void.
A structured JSON editor that turns raw files into labelled fields — with live validation and one-click export.
Illustration comparing raw JSON in a text file with the same content edited as structured labelled fields in the tinyJSON browser JSON editor
Before - JSON After - tinyJSON
THE PROBLEM
Sound familiar?
LOOP
Every update is a support ticket
One content change means a Slack thread, a screen share, and an hour of your time.
ERROR
Validation errors caught too late
The file looked fine. Then it hit production and nothing rendered.
tinyJSON fixes the handoff.
HOW IT WORKS
Three steps. No guesswork.
Open your JSON
Paste, upload, or drag and drop any JSON file. tinyJSON reads the structure automatically.
Edit safely
Every field is labelled so edits stay in the right place. Add a JSON Schema for live checks while someone types.
Export clean
Download the updated file in the exact same format, ready to drop back into your codebase or CMS.
FEATURES
Everything you need. Nothing you don't.
TREE
Structured tree editor
Edit deeply nested JSON as a clean field-by-field UI. No raw brackets. No broken syntax.
SCHEMA
Schema validation
Attach a JSON Schema to catch type mismatches and missing fields before the file leaves the editor.
HISTORY
Version history
Automatic checkpoints with full diffs. Restore any previous snapshot in one click.
OFFLINE
Works offline
Install as a PWA. tinyJSON works without an internet connection once loaded.
PRIVATE
Private by default
Your data never leaves your browser. No server. No account. No telemetry. Ever.
DIFF
Compare changes
Side-by-side diff view shows exactly what changed before you export.
How your data is stored
All data stays in your browser. Nothing is sent to any server. Attached JSON Schemas are saved in localStorage the same way as your files—never uploaded. Export or download anytime—clearing site data or switching devices means files stay only on this browser.
WHO IT'S FOR
Built for the handoff problem.
FOR DEVELOPERS
You own the JSON. You don't want to babysit it.
You're building or maintaining a JSON-driven site or app. You need a safe tool to hand to a client or content editor so they can make updates without your involvement — and hand back a file that won't break anything.
✓ Schema validation keeps structure intact
✓ Version history so you can see what changed
✓ No install — just send them a link
FOR CONTENT EDITORS
You edit content. You don't touch code.
You've been handed a JSON file and you're not sure where to start. tinyJSON turns it into a form you can edit confidently — then hands back JSON your developer can trust to keep the expected structure.
✓ Looks like a form, not a code file
✓ Can't accidentally corrupt the structure
✓ Export the same format you received
FAQ
Frequently asked questions
OVERVIEW
tinyJSON is a browser-based JSON editor that turns raw JSON files into a clean, structured form. Edit fields safely, attach a JSON Schema for validation, track version history, and export a clean file — all without installing anything or creating an account.
PRIVACY
Yes. Nothing ever leaves your browser. Your files are stored in localStorage on your device only — no server receives them, no account is required, and there is no telemetry or tracking of any kind.
WORKFLOW
Attach a JSON Schema to your document before handing it to a client. The schema defines which fields exist, what types they accept, and which are required. tinyJSON validates every edit against it in real time — so your client can't accidentally break the structure.
EDITING
Yes — two ways. Undo/redo works within the current session. Version history stores up to 50 automatic checkpoints per file, each with a plain-English summary of what changed. Restore any snapshot in one click.
AVAILABILITY
Yes. tinyJSON is a Progressive Web App (PWA). After your first visit the app is cached and works fully without an internet connection. Install it to your desktop or home screen for instant offline access.
PRODUCT
Not yet — but that's the direction. Right now tinyJSON is a local-first JSON editor that fits into headless CMS workflows as a safe editing layer. Cloud sync, collaboration, and a full CMS mode are on the roadmap.
LIMITS
Individual files are capped at 2MB. You can save up to 100 files with a 5MB total registry. Version history keeps up to 50 checkpoints per file. These limits reflect browser localStorage constraints — everything stays on your device.
GET STARTED
Fix the handoff today.
Free to use. No account required. Opens in your browser.
Open tinyJSON →
EARLY FEEDBACK
What developers are saying.
“
Finally a way to let a non-technical client edit content without me holding my breath every time.
— Developer, freelance web studio
“
The schema validation alone saves me from at least one support call a week.
— Frontend developer, agency
“
I sent this to a client instead of explaining JSON for the fifth time. Problem solved.
— Developer, SaaS product