All JSON Tools

Pretty-print JSON with syntax highlighting and 2/4-space or tab indent. Real-time error reporting.

Strict RFC 8259 validation with exact line and column error reporting.

Compress JSON to a single line. Reduces payload size 30-60%.

Turn text into a JSON string or back again. Presets reproduce the exact default output of Go, Python, PHP, Java and .NET serializers.

Turn an escaped blob back into readable JSON — including double-escaped — or a document into a string literal for Java, Python, JavaScript or the shell.

Compare two JSON documents semantically — find what changed regardless of key order.

Generate an RFC 6902 JSON Patch or RFC 7386 Merge Patch from two documents, or apply a patch and preview the result before you run it.

RFC 8785 canonical form plus SHA-256, with a warning when canonicalization changes a value before you sign it.

Validate JSON against a JSON Schema (Draft 7, 2019-09, 2020-12).

Infer a draft-07 or 2020-12 schema from samples, then check it against the samples it came from.

Run JSONPath queries against a JSON document with live results.

Bi-directional. Perfect for Kubernetes manifests, GitHub Actions, Docker Compose, OpenAPI specs.

Convert array of objects to CSV for Excel, Google Sheets, BI tools. Flattens nested objects with dot notation.

Validate line by line, convert to and from a JSON array, filter records with a JSONPath query, or summarise the file.

TypeScript, Go, Python, Rust, C# and Java type definitions from a JSON sample, with optional and nullable fields inferred.

Interfaces with optional and nullable fields inferred from the sample.

@Serializable data classes with @SerialName and proper null safety.

Codable structs, with CodingKeys only where a name differs.

Dataclasses with typing hints.

Pydantic v2 models with aliases that round-trip.

Structs with json tags, exported names and Go acronym conventions.

serde structs with rename and skip_serializing_if.

Classes with [JsonPropertyName] and nullable value types.

Classes with Jackson @JsonProperty annotations.

PostgreSQL CREATE TABLE, nested objects as their own table.

Bi-directional conversion preserving attributes and structure. Useful for SOAP, RSS, Atom.

Decode JSON Web Tokens. Inspect header and payload. Detects expired tokens. 100% browser-side.

Generate MD5, SHA-1, SHA-256, SHA-512, bcrypt, and 6 more cryptographic hashes.

Encode text and files to Base64 for transmission, embedding, or storage.

Decode Base64-encoded data back to plain text or binary.

URL-encode and decode query strings and URL components.

Generate and validate UUIDs in v1, v4, and v7 formats.

Test password strength and calculate entropy in real time.

Word, character, paragraph, and reading-time counts for any text.

Calculate square footage for rooms, real estate, flooring, paint, and construction projects.

Quick percentage calculations: what is X% of Y, percentage change, percentage of total.

Calculate exact age in years, months, days, hours, and minutes from a birth date.

Convert between Unix epoch timestamps and human-readable dates across any timezone.

Repeat any string a set number of times with custom separators — for testing and mock data.

Cron expression explainer and builder with plain-English output and next run times.

Regex explainer, tester, and pattern library with code in seven languages.

Engineering and scientific unit converter with printable reference cheat sheets.

Hours and timesheet calculator with overtime, breaks, and 50+ time zones.

Online alarm clock, timer, stopwatch, and world clock — all browser-based.

Convert text between Title Case, sentence case, camelCase, snake_case, kebab-case, and more.

Dimensional (billable) shipping weight for FedEx, UPS, USPS, DHL, and more carriers.

Browser-based image tools — compress, convert, resize, crop, and watermark. No uploads.

Calculate the volume of a box from its length, width, and height in any units.

Parcel length-plus-girth against carrier limits, plus body circumference for fitness.

Convert between profit margin and markup, with fees, shipping, tax, and break-even.

Calculate, split, and visualize subnets. IPv4/IPv6, VLSM, cloud-aware, Terraform export.

Subnet masks, usable host ranges, wildcard masks, and VLSM planning for IPv4 and IPv6.

Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files, in-browser.

Free, unbiased solar and off-grid calculators — sizing, savings, payback, and batteries.

EMI calculator for home, car, and personal loans in India, with full amortization schedules.

Merge, split, compress, convert, and rotate PDFs in your browser — no uploads.

Pick colors and convert between HEX, RGB, HSL, and CMYK, with palettes and contrast checks.

Generate QR codes and barcodes (Code 128, EAN, UPC), downloadable as PNG or SVG.

Voltage drop and wire size for AC/DC circuits using NEC and IEC formulas.

Estimate daily calorie needs, TDEE, and macros for weight loss, maintenance, or gain.

Total interest paid over the life of a loan, comparing terms and rates.

Size an air conditioner by room area and climate — BTU and tonnage estimates.

Volume and fill level for cylindrical, rectangular, and oval tanks in litres or gallons.

Cubic yards for concrete, mulch, gravel, soil, and sand from your dimensions.

Calculate BMI, BMR, and daily calorie needs in metric or imperial units.

Size an off-grid battery bank from daily load, autonomy days, and depth of discharge.

Add, subtract, multiply, and divide fractions with step-by-step working.

Estimate UPS and generator runtime from load and battery capacity.

Convert cooking measurements between cups, grams, ounces, and millilitres.

Convert numbers to words for cheques, invoices, and legal documents.

Work out stair rise, run, stringer length, and headroom to code.

Concrete volume plus cement, sand, and aggregate quantities by mix ratio.

Project mutual-fund SIP returns, step-up SIPs, and goal-based investing.

Roofing squares, shingle bundles, and underlayment from area and pitch.

Compute semester and cumulative GPA on 4.0 and weighted scales.

A hub of construction calculators — concrete, framing, drywall, paint, and more.

Pool volume in gallons or litres for rectangular, round, and oval pools.

Test download, upload, ping, and jitter right in your browser.

See your public IPv4/IPv6 address, ISP, and approximate location.

Look up domain WHOIS, registrar, name servers, and expiry dates.