Use Cases | Daily Developer Tools

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Convert JSON to CSV for Excel

Turn JSON arrays into Excel-ready CSV with headers. Fast, privacy-first conversion in your browser.

Primary tool: JSON to CSV Converter

Compare Two Email Lists

Find overlaps, unique contacts, and duplicates between two email lists in seconds.

Primary tool: List Comparator

Convert cURL to Fetch

Turn cURL commands into browser-ready fetch code for JavaScript apps.

Primary tool: cURL Converter

Format JSON for API Logs

Pretty-print and validate JSON logs for faster debugging and reviews.

Primary tool: JSON Formatter

Convert JSON to YAML for Kubernetes

Convert JSON manifests to YAML for Kubernetes, Helm, and DevOps workflows.

Primary tool: JSON <-> YAML Converter

Fix Base64 Encoding Errors

Decode, re-encode, and troubleshoot Base64 strings quickly and safely.

Primary tool: Base64 Encoder & Decoder

Diff Two Text Files

Compare two text files and highlight line-by-line differences.

Primary tool: Text Diff

Format SQL for Code Review

Format SQL queries with readable indentation for reviews and debugging.

Primary tool: SQL Formatter

Parse URL Query Parameters

Break down URLs into host, path, and query parameters for debugging and QA.

Primary tool: URL Parser

URL Encode Query Strings

Encode and decode query strings safely for tracking links and APIs.

Primary tool: URL Encoder

Decode a JWT Token

Inspect JWT headers, payload claims, and expiry dates instantly. Debug auth flows without exposing tokens to external servers.

Primary tool: JWT Decoder

Verify a JWT Signature

Sign and verify JWTs with HS256/RS256/ES256 and test PKCE OAuth flows — all in your browser.

Primary tool: JWT & OAuth Security Toolkit

Decode an X.509 Certificate

Inspect TLS certificate subject, issuer, SANs, and expiry dates. Decode CSRs before submission. Split PEM bundles.

Primary tool: Certificate & PEM Tools

Sanitise a HAR File Before Sharing

Redact auth headers, cookies, and API keys from Chrome or Firefox HAR exports before sharing with support teams.

Primary tool: HAR Sanitizer & Replay Packager

Build SQL JOIN Queries Visually

Generate FROM and JOIN boilerplate visually. Select tables, join types, and ON conditions without memorising syntax.

Primary tool: SQL Join Builder

Generate a SQL IN Clause from a List

Paste IDs or values from Excel or CSV and get a quoted SQL IN (...) clause. Supports chunking, deduplication, and NOT IN.

Primary tool: SQL IN Clause Builder

Validate JSON Against a Schema

Check API payloads against a JSON Schema and get precise error paths. Auto-generate a schema from sample JSON.

Primary tool: JSON Schema Validator

Infer a Schema from JSON

Paste any JSON payload and instantly infer its structure — property names, types, optional fields, and nested arrays.

Primary tool: Schema Inspector

Test JSONPath Expressions Online

Extract specific fields from large JSON responses using JSONPath. Test filters, wildcards, and recursive descent without writing code.

Primary tool: JSONPath Tester

Apply JSON Patch Operations

Build and apply RFC 6902 JSON Patch operations — add, remove, replace, move, copy, and test — against any JSON document.

Primary tool: JSON Patch & Pointer

Generate a Cron Expression

Build cron expressions using a visual scheduler and instantly preview the next run times.

Primary tool: Cron Builder

Understand a Cron Expression

Paste a cron expression you inherited and get a plain-English explanation along with the next 10 scheduled run times.

Primary tool: Cron Expression Analyzer

Convert .env to JSON

Instantly convert .env files to JSON objects and back. Mask secret values before sharing with teammates.

Primary tool: .env ↔ Properties ↔ JSON Converter

Parse and Build HTTP Headers

Paste raw HTTP headers from browser DevTools, inspect them in a grid, detect duplicates, and export as JSON.

Primary tool: HTTP Headers Parser & Builder

Generate UUIDs Online

Generate bulk UUID v4 values for test data, database seeds, and fixture files. Choose uppercase, lowercase, or hyphen-free formats.

Primary tool: UUID Generator