Small utilities that save time during coding and testing.
Pretty-print, minify, and validate JSON directly in your browser.
Runs in your browserOpen tool →Convert text to Base64 and back, entirely in your browser.
Runs in your browserOpen tool →Reference strings for parser and request-header tests in applications you own or are authorized to test.
Runs in your browserOpen tool →Encode text for a URL or decode percent-encoded values safely.
Runs in your browserOpen tool →Inspect a JWT header and payload without uploading the token.
Runs in your browserOpen tool →Convert Unix seconds or milliseconds to readable local and UTC dates.
Runs in your browserOpen tool →Generate SHA-256, SHA-384, or SHA-512 hashes from UTF-8 text.
Runs in your browserOpen tool →Convert quoted CSV data into JSON arrays or objects locally.
Runs in your browserOpen tool →| Problem | Tool | Boundary to preserve |
|---|---|---|
| A configuration fails to parse | JSON Formatter | Valid syntax, intended types, duplicate keys, and large identifiers. |
| A spreadsheet export needs API fixtures | CSV to JSON | Quoted commas, consistent columns, and string identifiers such as 001. |
| A query value contains spaces or reserved characters | URL Encoder/Decoder | One component versus the separators of a complete URL. |
| A text payload uses an encoded representation | Base64 Encoder/Decoder | UTF-8 text, standard Base64 versus Base64url, and unchanged bytes. |
| A test token's claims need inspection | JWT Decoder | Decoded claims remain unverified; never use a live login token as a public example. |
| A timestamp or digest differs | Timestamp Converter or Hash Generator | Seconds versus milliseconds and timezone, or exact UTF-8 text and line endings. |
| A client parser needs sample input | User-Agent String Reference | Fixed fixtures versus real browser behavior and authenticated identities. |
Convert id,name followed by 001,Amina from CSV to JSON. With headers enabled, the result contains {"id":"001","name":"Amina"}; the leading-zero identifier stays a string. Format it to inspect the types, then encode only the intended query value if it needs to enter a URL. If a later digest differs, compare the exact text and line endings before suspecting the algorithm.
The developer debugging guide works through connected examples and shows why decoding, formatting, hashing, and server-side validation solve different problems.
id,id followed by 001,002 produces Header names must be unique. A quoted newline belongs to one field. Download the CSV and compare the expected JSON.
The JSON experiment records malformed inputs, duplicate keys, and a large integer that changes. The CSV experiment records quoted newlines, BOM handling, duplicate headers, and a delimiter mismatch. Use these fixtures with the developer workflow guide; formatting or decoding does not validate authorization or business rules.
For a fictional record identifier, UUID Generator creates random version 4 values. Enforce uniqueness and access checks in the receiving application; possession of an identifier does not grant permission.
Reviewed guides, related tools, and the latest recorded review date.
Compare SHA-256, SHA-384 and SHA-512 for integrity checks, text hashing, APIs and authentication, and learn when hashing is the wrong tool.
Last updated October 9, 2026 · Related tool: Hash Generator
Read guide →Learn why valid JSON can still fail an API. Debug strings vs numbers, null and missing fields, arrays, nesting, duplicate keys, booleans and payload structure.
Last updated October 9, 2026 · Related tool: JSON Formatter & Validator
Read guide →Fifteen tested URL-encoding cases explain literal plus signs, form-query spaces, Unicode, reserved characters, and double encoding, with reusable fixtures.
Last updated October 9, 2026 · Related tool: URL Encoder & Decoder
Read guide →Thirteen browser tests compare SHA-256 results for whitespace, Unicode, CRLF normalization, and JSON formatting, with independent checks and fixtures.
Last updated October 9, 2026 · Related tool: Hash Generator
Read guide →Work through JSON types, encoding, URL components, JWT claims, hashes, CSV conversion, and timestamps with small reproducible examples.
Last updated October 9, 2026 · Related tool: JSON Formatter & Validator
Read guide →
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