Starts an AI music detection (POST /ai-music/jobs) on a local audio file (path, or base64 content: 100 MB and 600 seconds at most), OR on exactly one link: "url" (Spotify track link), "spotifyTrackId", "isrc" or "audioUrl" (direct audio link; YouTube is not supported; a Spotify or ISRC source may only provide an excerpt, see result.primary.audioSource). Links only work when jj_ai_music_availability reports links=true. Asynchronous: returns at once with a job (pass maxWaitMs to wait), then follow it with jj_ai_music_get_job. One unfinished analysis per account at a time (409), results kept 90 days, no audio kept. Needs the audio:write scope. Consumes one unit of the ai-music counter (free 5/day and 50/month, Premium 30/day and 300/month, UTC; failures refunded); a 429 states when it resets, a 413 means the file is too large or too long. The report is an aggregated index of signals, not a probability and not proof of origin: present it as such.

Reports whether the AI music detection is available (GET /ai-music/availability): upload size and duration limits, whether links are accepted, and the remaining daily and monthly quota with exact reset times (quota.daily.resetsAt, quota.monthly.resetsAt, epoch milliseconds, UTC). Quotas: visitor 2/day and 5/month, free account 5/day and 50/month, Premium 30/day and 300/month, shared between website, app and API keys; failures and cancellations are refunded. Call it before jj_ai_music_analyze and after a 429. Costs nothing.

Cancels the caller's own AI music analysis and deletes its temporary files (DELETE /ai-music/jobs/{id}). The quota unit is refunded. Needs the audio:write scope. Only call it when the user asked to stop that analysis.

Returns the caller's current or most recent AI music analysis, or null when there is none (GET /ai-music/jobs). Use it to find the id of a running analysis, since only one unfinished analysis per account can exist. Needs the queue:read scope. Costs no quota.

Fetches one AI music analysis by id (GET /ai-music/jobs/{id}): state (uploading, queued, running, cancelling, done, failed, cancelled), progress, queue position and, once done, the report in "result" (score 0 to 100, verdict signals-detected / few-signals / inconclusive, per-detector windows, and for the v3 report the classification human / processed-ai / pure-ai). The report is an aggregated index of signals, not a probability and not proof of origin: present it as such. A job of another account answers 404. Needs the queue:read scope. Costs no quota.

Lists the caller's own analyses of the last 90 days, newest first, 30 per page (GET /ai-music/history): source label (file name or link), dates, state and report, never any audio. Needs an account and the queue:read scope. Pass the returned "nextBefore" as "before" for the next page. Costs no quota.

Uploads a local audio file (path, or base64 content) to the Jam Jam server queue so that its chords and lyrics are analysed, then automatically aligned, for a song of YOUR notebook (POST /audio). Same queue as the Jam Jam app. "songId" must already exist in the caller's notebook (see jj_list_songs), otherwise 404. Needs an account and the audio:write scope. It returns at once with a job: follow it with jj_queue_get_job. Idempotent per (account, song, file content): sending the same file again returns the same job with reused=true and consumes nothing. Quota: counter "audio-analysis", 5 analyses per ISO week on a free account (resets Monday 00:00 UTC), no limit on Premium; at most 50 jobs may wait per account. Errors: 413 file too large, 415 not audio, 429 quota or queue full.

Returns, in one call, what the calling Jam Jam identity is allowed to do and how much of each allowance is left. THREE INDEPENDENT COUNTERS, they never borrow from one another: conversion (6 per week on a free account, 500 per calendar month on Premium, 3 per 24h anonymous), read (2000 per UTC day free, 20000 Premium, spent by the notebook and social listing tools) and write (200 per UTC day free, 5000 Premium, spent by the notebook writing tools). Stem separation and AI music detection keep their own counters, read with jj_stems_capabilities and jj_ai_music_availability. scopes lists the permissions of the API key in use. Call this before a batch, and after a quota error to learn when it resets. Costs nothing itself.

Uploads a local file (path, or base64 content) to the Jam Jam API, waits for the conversion to finish, and returns the result: embedded text for small text formats (ChordPro, .lrc, .lab...), or a local file path for binary formats (PDF, MIDI, MP4...). Call jj_list_formats first to find valid "output" ids for your input. Consumes one unit of the conversion quota (6/week free, 500/month Premium, see jj_check_usage), which is a different counter from notebook reads and writes.

Sends plain text or ChordPro (pasted lyrics and chords, no file) to the Jam Jam API, waits for the conversion to finish, and returns the result: embedded text for small text formats, or a local file path for binary formats (PDF, MIDI...). Call jj_list_formats first to find valid "output" ids. Consumes one unit of the conversion quota.

Saves a named Mastering preset on the account (POST /mastering/presets): a name of 1 to 60 characters, unique among the account presets, and the settings (all eight modules with value and enabled, a loudness target, normalize). Each value must be within its range and on its step: read them with jj_mastering_capabilities, or copy the settings of a built-in preset and change a few values. The API answers 422 with the path of every rejected field when the settings are invalid, 409 when the name is taken or the 50-preset cap is reached. Open to any account, free or Premium. Counts one unit of the daily write quota. Only call it when the user asked to save a preset.

Creates a playlist in the calling account's notebook. Playlists are flat and allow multi-membership: a song can be in several of them. songIds is the ordered content and every id must be a live song of this account. Consumes one unit of the daily write quota.

Adds a song to the calling account's PRIVATE notebook. song is the canonical pivot payload: exactly the object returned by jj_get_song (song) or by a conversion whose output is "songbook", so converting then filing is a copy with no transformation. The id is DERIVED, never random: song.id if given, otherwise an "artist-title" slug. That means posting the same song twice REPLACES it instead of creating a duplicate, and it is also how you rewrite a song wholesale (read it with jj_get_song, edit the payload, post it back with its id). Adding NEVER publishes anything on the public profile. Consumes one unit of the daily WRITE quota (200/day free, 5000 Premium).

Deletes a playlist, and ONLY the playlist: its songs stay in the notebook and in their other playlists. Idempotent, and an unknown id succeeds too. If the playlist was published on the profile, that published copy disappears.

Deletes a song from the calling account's notebook. Idempotent: deleting twice succeeds twice, and an unknown id succeeds too (saying "no such song" would leak whether it exists in someone else's notebook). Side effects are the same as deleting in the app: the song leaves all its playlists, its published copy disappears from the profile, and accounts that had imported it are notified. This cannot be undone from the API: confirm with the person before calling it.

Fetches the current state of a conversion job by id: phase (queued/running/done/failed/cancelled), per-step progress, and the list of artifacts once done. Use this to check on a job after jj_convert_file or jj_convert_text stopped waiting for it.

Returns one playlist of the calling account's notebook with its songs in summary form, in playlist order, paginated by the same opaque cursor. A song the playlist still references but that has since been deleted from the notebook is simply skipped.

Returns the profile card of a Jam Jam account designated by its public @handle, seen from the calling account: display name, bio, avatar, visibility (public/private), follower and following counts, and relation (none / following / follower / mutual / requested / self). A PRIVATE account the caller does not follow returns a closed card without bio or counts. An unknown handle returns not-found. Jam Jam is a host: this never ranks or recommends anyone, and never exposes somebody else's audience figures.

Returns one song of the calling account's notebook in full: the summary fields AND song, the canonical pivot payload (sections, lines, chords with their offsets, lyrics, detectedKey, metadata). That payload is exactly what jj_create_song and jj_update_song accept, so reading then writing back is a copy, not a translation. An unknown id and an id belonging to another account both return the same not-found error.

Lists the calling account's own followers, newest first. status="requested" lists the follow requests it has not accepted yet. Only the caller's own relations are readable; reading somebody else's followers is not offered by this API.

Lists the accounts the calling account follows, newest first. status="requested" lists the requests it has sent to private accounts and that are still pending. Following and un-following are done in the Jam Jam application, never by API.

Lists the input and output formats actually served by the Jam Jam API right now (GET /formats), with their limits (maxBytes, maxPages, maxDurationS) and whether they require an account or Premium. Call this FIRST, before jj_convert_file or jj_convert_text, to know which output ids are valid for a given input. Pass "input" to get the exact list of possible outputs for that one input format. Needs no API key.

Lists the Mastering presets saved on the account, newest first (GET /mastering/presets), with their full settings, plus the ids of the read-only built-in presets (builtin:balanced, ...) which are valid as the preset of jj_master_audio. No pagination: an account keeps 50 presets at most. Open to any account, free or Premium. Counts one unit of the daily read quota.

Lists the playlists of the calling account's notebook. Playlists are FLAT and allow multi-membership: songIds is the ORDERED list of song ids, and one song can appear in several playlists. Same cursor pagination and same updatedSince incremental filter as jj_list_songs. Consumes one unit of the daily read quota.

Lists the playlists an account has published on its profile. Same visibility rules as jj_list_profile_songs. songCount already counts only what the caller is allowed to see: a published playlist hides the songs its author did not publish.

Lists the songs an account has chosen to publish on its profile, newest first, with cursor pagination. hasAudio and audioPlayable are only ever true between accounts that follow each other MUTUALLY: without that link the very existence of a backing track is withheld, and no endpoint serves audio at all. A private account you do not follow refuses the call; an unknown handle returns not-found. Consumes one unit of the daily read quota.

Lists the songs in the calling account's PRIVATE Jam Jam notebook, page by page, oldest update first. fields="summary" (default) gives id, title, artist, key, capo, bpm, playlistIds and updatedAt; fields="full" adds the complete pivot payload (chords, lyrics, sections) and lowers the page cap to 25. Use the returned nextCursor to get the next page, and stop when it is null. Consumes one unit of the daily READ quota (2000/day free, 20000 Premium), never a conversion.

Uploads a local audio file (path, or base64 content) and renders it with a Mastering preset on the server (POST /mastering/jobs): the same engine as the Jam Jam web tool. Pass EXACTLY ONE of preset (a preset id from jj_list_mastering_presets, or builtin:) and settings (inline settings, see jj_create_mastering_preset). The result is a 48 kHz WAV (format wav-pcm16 by default, wav-pcm24, or wav-f32). Asynchronous: by default this returns at once with the job, then follow it with jj_mastering_get_job; pass maxWaitMs to wait, and a render that finishes in time is downloaded in the same call (file). Open to any account (3 renders per ISO week for a free account, 429 quota-exhausted beyond; unlimited for Premium) and needs the mastering:write scope. Limits: a file of at most 200 MB and 10 minutes, one or two channels; one render runs and three wait per account. The render consumes the Mastering render counter (shared with the Jam Jam app), counted at submission; a failed or cancelled render is refunded. Results are kept 24 hours. Only call it when the user asked to master that file.

Cancels one of your own renders and deletes its files (DELETE /mastering/jobs/{id}). The render quota already consumed is refunded when the render was not finished. Needs the mastering:write scope. Only call it when the user asked to stop that render. An unknown id, or a render of another account, answers 404.

Reports the live contract of the Mastering engine (GET /mastering/capabilities): for each of the eight modules the unit, range, step, neutral and initial value, the loudness targets, the built-in presets (builtin:balanced, ... with their full settings, a good starting point for a new preset), the limits (200 MB, 10 minutes, 50 presets of 60 characters), the validation tolerance, whether THIS account may render through the API (renderAllowed: any account with mastering:write) and the render quota balance. Call it before jj_create_mastering_preset or jj_master_audio with inline settings. Needs no scope and costs nothing.

Fetches one of your renders by id (GET /mastering/jobs/{id}): status (queued, decoding, analyzing, rendering, done, failed, cancelled, expired), progress, queue position, a copy of the settings used and, once done, the loudness measures before and after (report) and the sha256 of the result. With download=true on a finished render, the mastered WAV (GET /mastering/jobs/{id}/result, free to repeat) is downloaded to a local file and its path returned. A render unknown or belonging to another account answers the same 404; results are kept 24 hours (410 afterwards). Costs no quota (read rate limit): poll no faster than every few seconds.

Cancels one job of the caller's own audio queue (DELETE /queue/{id}). The unit is refunded ONLY if the analysis had not completed yet; during alignment, the analysis already delivered is kept, without refund. 409 when the job can no longer be cancelled. Needs the audio:write scope. Only call it when the user asked to stop that job.

Fetches one job of the caller's audio queue by id (GET /queue/{id}): status (queued, active, done, failed, cancelled), stage (analyze, align), per-step status, progress and rank. An unknown id and a job of another account answer the same 404. Needs the queue:read scope. Costs no quota.

Lists the caller's audio analysis jobs in three groups (GET /queue): "active" (running), "queued" (waiting, with "rank" = real service order) and "done" (finished, failed or cancelled in the last 7 days). Needs an account and the queue:read scope. Costs no quota.

Cancels one of your own separations that is still uploading, queued or running (DELETE /stem-tool/jobs/{id}). Needs the stems:write scope. Only call it when the user asked to stop that separation. Costs no quota. An unknown id, or a job of another account, answers 404.

Reports whether stem separation is available right now (GET /stem-tool/capabilities), the models this account may use ("fast" and "quality"), the file formats ("mp3", "flac"), the maximum duration and upload size, how long results are kept, and the remaining quota with its reset time (quota.fast and quota.quality, resetsAt in epoch milliseconds, UTC). Call it before jj_stems_separate. Costs no quota (only the read rate limit, 240 per minute). An API key must belong to a Premium account.

Fetches one result file of a finished separation (GET /stem-tool/jobs/{id}/files/{name}): a stem (vocals, instrumental, drums, bass, other, depending on the number of stems chosen; .mp3, or .flac when the job has format "flac") or all of them as stems.zip. By default the file is downloaded and its local path is returned; with download=false only the signed link is returned, valid for about 60 seconds. Files are kept 24 hours after the separation (410 afterwards); the job must be in state "done" (409 otherwise). Costs no quota (read rate limit).

Fetches the state of one of your separations by id (GET /stem-tool/jobs/{id}): state (uploading, queued, running, saving, done, failed, cancelled, expired), queue position, processed seconds against duration, time estimates, and, once done, the names of the stems available. A job unknown or belonging to another account answers the same 404. Costs no quota (read rate limit, 240 per minute): poll no faster than every few seconds.

Lists your recent separations, newest first, 30 per page (GET /stem-tool/jobs). Use it to find a job id again, or to see whether one is still running before starting another (only one can run at a time). Pass the returned "next" as "before" for the next page. Costs no quota (read rate limit).

Uploads a local audio file (path, or base64 content) and starts its separation into vocals + instrumental (stems=2) or vocals + drums + bass + other (stems=4) (POST /stem-tool/jobs). Asynchronous and slow (minutes, up to hours for a long file): by default this returns at once with the job, then follow it with jj_stems_get_job and fetch the files with jj_stems_get_file; pass maxWaitMs to wait for a short file instead. Needs the stems:write scope and an API key from a Premium account (403 otherwise). Limits on Premium: a file of at most 1 h 30 and under 2 GB (5 minutes and 100 MB without Premium). Quotas, in UTC days and calendar months, with ONE counter per account shared by both models and by the website: 30 jobs/day and 500/month on Premium (81000 s of audio/day, 540000 s/month). Only one separation can run at a time per account. A 429 states when the counter resets; a 413 means the file is too large or too long. Stems come as MP3 320 kb/s by default, or as FLAC 24-bit with format="flac" (lossless, about 4 times larger). Check jj_stems_capabilities first.

Changes one or more fields of a playlist: name, coverEmoji (null removes it), and songIds, which REPLACES the whole content and its order. Only the fields you pass move. To reorder, read the playlist with jj_get_playlist first and send the full list back in the new order.

Changes some fields of one song of the calling account's notebook. Only the fields you pass move; a field set to null erases its value. key is the DISPLAYED key ("G", "Am"). playlistIds is the complete target membership, so it is idempotent. publish: true puts the song on the account's public profile and requires publishDeclaration the first time, plus a public username; publish: false removes it and has no conditions. Publishing is a deliberate act by the account holder: never publish unless they asked. To rewrite lyrics, chords or structure, use jj_create_song with the song's id instead.