Schema and types

20 properties, 18 required, inferred from 3 samples merged; 6 enums and 3 formats (email, date-time, uri) detected.

Sample

subscriptions.json

JSON Diff

7 changes across plan, coupon, features and metadata; the other 5 top-level keys are equal.

Before

subscription-before.json

After

subscription-after.json

Query

$.plan.amount matched 1 value in subscription-after.json.

Document

subscription-after.json

JSONPath

$.a.b · [n] · [*] · ..key

Validate

Not valid JSON. Line 8, column 22: Expected "," or "}" after this value, found a quote.

Document

webhook-payload.json

Result

IP

100.72.14.9: Shared (carrier-grade NAT), IPv4. Who owns it and where it is need a lookup over the network.

Address

IPv4 or IPv6 address

Owner and location

Not looked up.Finding who owns an address and where it is needs a request to an IP information service, so the address would leave this browser. This build makes no network requests, so this panel stays empty rather than guessed.

Organisation: —
Network (ASN): —
Country: —
City: —

Ping

api.northwind-labs.io has not been pinged yet. Press Ping to time 3 HTTPS requests from this browser.

Host

This tool contacts only the host you enter, and sends nothing else: no cookies, no referrer, nothing you pasted elsewhere in json0.

Round trips

3 attempts, 5 s timeout

Attempt	Status	Time
1	—	—
2	—	—
3	—	—

Browsers cannot send ICMP pings, so this times an HTTPS request from this browser to the host you typed, one second apart. The status code is not readable from a browser, so a reply only proves the host answered.

Base64

63 bytes of text is 84 Base64 characters.

URL-safe alphabet

Text

Type here to encode.

Base64

Type or paste here to decode.

JWT

HS256 token for cus_R2d9; its expiry is read against this device’s clock.

Token

Claims

Header

Payload

Signature

Hash

21 bytes hashed four ways; SHA-256 begins 9ee4f2bb8af0.

Input

Digests

hex, lower case

UUID

8 version 4 UUIDs from crypto.randomUUID, 122 random bits each.

How many

UUIDs

Upper case

Format

XML to JSON

<invoice> and 5 elements inside it converted; repeated elements became arrays.

XML

JSON

attributes as @name, text as #text

Format

Pretty-printed at 2 spaces: 621 bytes becomes 836 bytes (+35%), 32 keys.

Sort keys

Input

invoice.min.json

Output

Table

12 rows × 16 columns from a top-level array, with 3 nested objects flattened into dot paths; the sparsest column, discount.coupon, is filled in 3 of 12.

JSON

invoices.json

Rows

Filter rows

CSV viewer

11 rows × 10 columns, comma-delimited; 1 duplicate row (row 9 repeats row 4); notes is empty in 6 rows.

First row is the header

CSV

customers.csv

Rows

Filter rows

Column profile

Typed numbers and booleans

CSV diff

6 differences keyed on customer_id: 2 rows added, 1 removed, 3 cells changed in 2 rows; 5 rows unchanged.

Key column Ignore spaces around values

Before

customers-2026-10-01.csv

After

customers-2026-10-24.csv

Differences

Extended JSON

11 typed values (2 ObjectIds, 2 Longs, 2 Dates, 1 Decimal128, 1 Int32, 1 Timestamp, 1 Binary, 1 Regular expression) read from mongosh shell syntax and written as canonical Extended JSON v2, with every type kept.

Input

subscription.mongosh.js

Output

Typed values

ObjectId

5 ObjectIds created between 30 Sept 2026 and 24 Oct 2026, by 2 processes (distinct random values).

Decoded

select a row for its bytes

ObjectIds

hex, ObjectId("…") or {"$oid": "…"}, one or many

Selected

Generate

Created at (UTC)

How many

Range filter

From (UTC, inclusive)

To (UTC, exclusive)

Query tester

4 of 10 documents match (40%), sorted by plan.amount, projected to 3 fields. Run in this browser, no server.

Documents

subscriptions.json

Filter

Projection

Sort

Limit

Results

Schema analyzer

18 fields across 10 documents; 2 fields have mixed types to fix (plan.seats is Int32 in 9 and String in 1, and 1 more); 3 fields are missing from some documents.

Documents

subscriptions.export.json

Fields

Redact

14 sensitive values in 13 fields: 1 JWT, 3 API keys, 2 emails, 1 IBAN, 2 phone numbers, 1 card number, 2 IP addresses and 2 secrets by key name. Scanned in this browser; nothing was sent.

The scan runs in this browser. Nothing you paste here is sent anywhere, and the hashes are computed with Web Crypto on this device.

Input

support-export.json

By kind

choose what happens to each

Findings

Redacted

Request a feature

Ask for a tool, report a bug or ask a question. The form itself sends nothing: it writes a GitHub issue or an email for you to send.

Your request

Title and details are required

Kind

Tool

Title

Details

What should it do, and what would you use it for? A small sample helps. Leave out anything private.

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Your email or handle, if you would like a reply

Optional. On GitHub it appears in the issue, so it is public there.

Open as a GitHub issue Send by email

This form sends nothing by itself. Open as a GitHub issue opens a new tab with the issue filled in; it posts publicly once you submit it there. Send by email opens your mail app with the message written.

Preview

public once you submit it on GitHub

[New tool] Untitled

Write to me directly

siddharthachauhan304@gmail.com

Or reach me at sidstack.in