Exact data. Local inspection.
Inspect and compare JSON.
Keep every digit.
FieldLens inspects JSON and compares two versions without rounding large numbers. Review nested fields, address and amount changes, then export a report with the original values preserved.
Your input stays in this browser tab. Start with the example or your own public JSON.
Changed fields
Markers identify fields worth reviewing. They do not validate an address, network, contract, transaction or payment.
Built for exact comparisons
Numbers stay exact
Numbers remain their original decimal text, including integers larger than JavaScript can represent safely. A one-unit change is visible. Equivalent number forms such as 1 and 1.0 are marked “notation changed.”
Structure before formatting
Object key order and whitespace do not create changes. Arrays are compared by index, so inserting an item can change later positions. A missing key differs from null; a string differs from a number.
Unambiguous paths
Paths use JSON Pointer: / is a separator, ~1 means a slash in a key and ~0 means a tilde. The empty root path is shown as “(root)”. Duplicate object keys are rejected instead of silently overwritten.
Inspect or export
Inspection lists every node and its type. Expand object or array values to read their exact JSON. Reports store original values as strings so other software need not round them. Reports can contain sensitive data; share them carefully.
Your data stays with you
No input uploads, API calls, analytics, browser storage or AI at runtime. The hosting provider receives ordinary website requests. This is a code-based review aid, not a security audit or transaction simulator.
Never paste seed phrases, private keys or passwords into any web tool. Input disappears when you leave or clear the tab.
The offline download is a self-contained HTML file. Open it in a modern browser; companion links need internet.
Keep practical tools free
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All features are free. An optional donation helps support this collection. No donation unlocks extra features and none is required.
USDT · Ethereum mainnet · ERC20 only
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Bitcoin (BTC)
Bitcoin mainnet
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Native ETH
Ethereum mainnet
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