JSON Bin Builder and Validator
Create and manage local JSON bins in your browser. Validate, format, minify, and save JSON locally — useful for preparing demo payloads, static-site data, configuration examples, and API test samples. This tool does not upload your JSON to AmbiSecure servers; everything runs in your browser.
How to use this tool
What it does
Builds a binary blob from a JSON description of fields, entirely in the browser.
When to use it
Use it to assemble a test frame or record from a structured field list without writing a one-off script.
Worked example
Describe a small TLV as JSON and export the assembled bytes.
JSON
Result
JSON Schema (optional)
Local JSON bins
Local browser storage only. Saved bins live in this browser’s localStorage — they are never uploaded, and clearing your browser storage may delete them.
- No saved bins yet.
What this tool does
A browser-only JSON helper. Paste or create JSON, then validate its syntax, format it into readable JSON, or minify it into a compact single line. Save named JSON bins in local browser storage, then reopen, duplicate, and delete them. It is built for preparing JSON payloads for API testing, static-site data files, demo apps, and configuration examples — before you paste them into another system.
Local storage behavior
This is a static-site tool. Your JSON is processed entirely in the browser. Saved bins are stored only in this browser’s local storage — the tool does not create public API endpoints, does not generate fetchable URLs, and does not upload JSON to AmbiSecure. Clearing your browser storage (or using a private window) may delete saved bins.
Common use cases
API & demos
API payload testing, demo-app data, and developer-handoff samples you want to format and sanity-check first.
Static-site data
Prepare JSON data files, FAQ/resource-list JSON, and configuration examples for a static build.
Pre-flight checks
Validate and tidy JSON before pasting it into another system, a config store, or a code review.
What not to put here
This is a convenience tool, not a vault. Do not paste or store:
- Passwords
- API keys
- Access tokens
- Private customer data
- Regulated data
- Production secrets
- Production security-sensitive configuration
Security note
Browser-local tools are handy for everyday convenience, but local browser storage is not a secure vault: shared or managed computers, browser extensions, and synced profiles can all expose local data. Production systems that handle real data need authentication, authorization, expiry, access controls, logging, secure hosting, and data classification — none of which a client-side helper provides.
For context: token-bearing URLs from JSON-bin–style hosted systems are convenient but are not equivalent to strong authentication — anyone with the URL can read the data. This static AmbiSecure version sidesteps that risk entirely because it does not create token URLs or any server-side endpoint; nothing leaves your browser.
Companion tools
More utilities
Attribution
This tool is based on the open-source GitHub project by Alex Zirbel.
Frequently asked questions
What does this tool store and where?
Bins are held in your browser's local storage. Nothing is uploaded, and clearing site data removes them permanently — there is no server-side copy to recover.
Why does my JSON fail to validate?
Usually trailing commas, single quotes, unquoted keys, or a byte-order mark at the start. All are valid JavaScript habits that strict JSON rejects.
What is the difference between formatting and minifying?
Formatting adds indentation for reading; minifying strips all insignificant whitespace for transport. Neither changes the parsed value.
Is this suitable for production data?
No. It is a scratchpad for API testing, demos and configuration examples. Anything that matters belongs in version control.
Does anything I paste leave my browser?
Nothing. The tool is entirely client-side: the page ships a static script, does no network calls, and never transmits what you paste. You can confirm it by opening the network tab, or by loading the page and then going offline.